DL3800 DS1 Inverse Multiplexer User Guide Part 098-10380-01 Rev J February 1999
COPYRIGHT Copyright © 1999, Digital Link Corporation World copyright reserved. No part of this publication may be stored in a retrieval system, transmitted, or reproduced in any way, including but not limited to photocopy, photograph, magnetic, chemical, or other record, without the prior agreement and written permission of Digital Link Corporation.
Digital Link shall not be liable for failure to perform its obligations if such results directly or indirectly from, or is contributed to by, any act of God or of buyer; riot; Þre; explosion; accident; ßood; sabotage; epidemics; delays in transportation; lack of or inability to obtain raw materials, components, labor, fuel or supplies; governmental laws, regulations or orders; or labor trouble, strike, or lockout (whether or not such labor event is within the reasonable control of Digital Link); other circu
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Malfunction of the equipment: In the event this equipment should fail to operate properly, disconnect the unit from the telephone line. Try using another FCC approved telephone in the same telephone jack. If the trouble does not persist and appears to be with this unit, disconnect the unit from the telephone line and discontinue use of the unit until it is repaired.
vi DL3800 DS1 Inverse Multiplexer User Guide—February 1999
Table of Contents Audience xvii Organization xvii Conventions xviii Symbols Typography xviii xix Digital Link Technical Support xx Returning a Unit xx Send Us Your Comments xxi Document Change Record xxi Chapter 1, Quick Install Guide 1-1 Purpose 1-1 Configuration 1-1 Equipment Needed 1-1 Setup 1-2 Terminal Log on 1-2 Terminal Configuration 1-2 Unit Configuration 1-2 DTE Configuration 1-2 Network Configuration 1-3 Save Configuration 1-3 Chapter 2, Introduction 2-1 Sys
DL3800 System Features 2-6 DL3800 System Benefits 2-6 Application 2-7 Chapter 3, Installation 3-1 DL3800 Installation Procedure 3-1 Mounting The DL3800 3-2 Rack Mounting 3-2 Desk Operation And Stacking 3-2 Power Cables And Connections 3-3 AC Power Connection 3-3 DC Power Connection 3-3 T1 Network Connection 3-4 DTE Cable And Connection 3-4 ASCII Terminal and SNMP Connection 3-5 Direct Connection 3-5 Modem Connection 3-5 Telnet Connection 3-5 Daisy Chaining 3-6 Chapter 4,
DTE Configuration 4-16 Network Configuration 4-18 Network Thresholds 4-23 Save Configuration 4-24 System Utilities 4-24 Software Download 4-25 Software Download Options 4-27 RAM Software Options 4-28 Delete Entire Unit Configuration (revert to factory config) 4-29 Login Configuration 4-30 SNMP Configuration 4-33 In-Band SNMP to Remote 4-36 Save Configuration 4-36 Tests 4-36 DTE/Network Loopback 4-37 Payload Loopback 4-38 Line Loopback 4-38 Local Loopback 4-38 Manual Netwo
Top Menu 5-5 Select Remote/Select Local 5-7 Display Menu 5-7 Node (Common Equipment) Status 5-8 DTE Status 5-9 NET (1-8) Status 5-9 NET (1 through 8) Statistics 5-9 Test Menu 5-11 DTE Tests 5-13 DTE/NET Loopback 5-13 Network Tests (1 through 8) 5-14 Payload Loopback 5-14 Line Loopback 5-15 Local Loopback 5-15 Configuration Menu 5-15 Node Configuration 5-17 DTE Configuration Menu 5-22 Network Config 5-22 NET N Config 5-23 Network Thresholds 5-24 Chapter 6, Diagnostics
External Clock Interface A-1 DTE Interface A-2 COMM Port A-2 NMS Port (SNMP) A-2 Front Panel A-3 Diagnostics A-3 Power A-3 Environmental A-4 Physical /Connectors A-4 Appendix B, Pinouts B-1 Terminal Connection B-1 DTE Connectors B-1 T1 Network Pin Assignments B-4 DB-25 to DE-9 Adapter Pinouts B-4 External Clock Connector Pin Assignments B-5 DTE Clock Rates B-6 Appendix C, Factory Default Settings Table of Contents B-1 -xi
Table of Contents -xii
List of Figures Figure 1-1 The DL3800 DS1 Inverse Multiplexer 1-1 Figure 2-1 DL3800 Inverse Multiplexer 2-1 Figure 2-2 DL3800 Functional Schematic 2-4 Figure 2-3 Typical Application for DL3800 2-7 Figure 3-1 DL3800 Rear Panel 3-3 Figure 4-1 INVERSE MULTIPLEXER MAIN MENU 4-3 Figure 4-2 Main Menu with remote unit selected 4-5 Figure 4-3 ALARMS AND STATUS MENU 4-6 Figure 4-4 STATISTICS MENU 4-8 Figure 4-5 4-9 STATISTICS MENU (Screen #1) Figure 4-6 STATISTICS MENU (Screen #2) 4-10 Figure
Figure 4-12 Network Thresholds ConÞguration 4-23 Figure 4-13 SYSYTEM UTILITIES MENU Figure 4-25 Figure 4-14 SOFTWARE DOWNLOAD MENU 4-25 Figure 4-15 LOGIN CONFIGURATION MENU 4-31 Figure 4-16 SNMP CONFIGURATION MENU 4-33 Figure 4-17 TESTS MENU 4-37 Figure 4-18 Loopbacks Within the DL3800 4-38 Figure 4-19 MANUAL NETWORK RESTORATION MENU 4-39 Figure 5-1 Front Panel Top Level Menu 5-6 Figure 6-1 TESTS MENU 6-2 List of Figures -xiv
List of Tables Table 4-1 Main Menu 4-4 Table 4-2 Alarms and Status 4-6 Table 4-3 STATISTICS MENU Error Types 4-10 Table 4-4 Alarm Level 4-11 Table 4-5 Node Configuration Options 4-14 Table 4-6 DTE CONFIGURATION MENU Options 4-16 Table 4-7 NETWORK CONFIGURATION MENU Options 4-19 Table 4-8 Login Configuration Options 4-32 Table 4-9 SNMP Configuration Options 4-33 Table 5-1 Front Panel LEDs 5-3 Table 5-2 NET Statistics Menu Information Display 5-9 Table 5-3 NET Statistics Items 5-10 Tab
Table B-1 COMM and NMS Port Pin Assignments B-1 Table B-2 HSSI DTE Connector Pin Assignments B-1 Table B-3 DB-25 to V.
Preface The DL3800 DS1 Inverse Multiplexer User Guide provides the information you need to install, test, operate, and manage the DL3800. AUDIENCE This guide is prepared for network managers and technicians who are responsible for the installation of LAN-to-WAN equipment, and who are thoroughly familiar with the network topology in which the DL3800 is expected to operate. ORGANIZATION Chapter 1, ÒQuick Install Guide,Ó provides a concise installation procedure for most applications.
CONVENTIONS This section describes the conventions used to delineate speciÞc types of information throughout Digital Link user guides. Symbols Symbols denote text that requires special attention. The information contained alongside a symbol corresponds to one of four levels of severity: NOTE: Follow guidelines in this, or the previous, paragraph to use the Digital Link product more effectively. CAUTION: Follow guidelines in this, or the previous, paragraph to avoid equipment damage or faulty application.
Typography Digital Link manuals delineate the names of Þles, commands, and actions by using the fonts and typefaces described in the following table: Typeface or Symbol Courier Font AaBbCc123 Courier Font, Bold AaBbCc123 Palatino Font, Italic AaBbCc123 Purpose Example The names of commands, files, and directories, as well as on-screen computer output. Edit your.login Þle. The input you provide, as contrasted with on-screen computer output.
DIGITAL LINK TECHNICAL SUPPORT If you should experience difÞculty with the setup and/or operation of your Digital Link equipment, the Digital Link Technical Support staff can assist you at any time. Telephone (408) 745-4200 FAX (408) 745-4240 Email support@dl.com Internet www.dl.com Before you place a call for help, use the form provided at the end of this Preface to assemble the information that your technical support representative is likely to request.
SEND US YOUR COMMENTS Please let us know if this user guide meets your requirements. Does the manual answer your questions? Is the manual thorough? Is the manual easy to use: can you Þnd the information you need? Is anything missing from the manual? What would you like to see in the manual? Digital Link Technical Publications FAX (408) 745-6250 Email techpubs@dl.com All suggestions and comments are appreciated. DOCUMENT CHANGE RECORD Date Issue Rev.
-xxii DL3800 DS1 Inverse Multiplexer User Guide—February 1999
Quick Install Guide 1 1 PURPOSE This chapter is designed to be a quick reference for the setup and conÞguration of the DL3800 DS1 Inverse Multiplexer (see Figure 1-1). Please note that not all conÞguration items will be discussed as this chapter serves to get the end user up and running only. For further explanation of all conÞguration items and testing capabilities, please refer to the rest of this userÕs guide.
1 ¥ HSSI or 155-10082-01(HSSI) (Model DL1404-10) ¥ M-34 to DB-25 cables(V.35) or 155-00903-01(V.35) (Model DL1300-10) ¥ DC-37 to DB-25 (RS-449)155-00902-01(RS449) (Model DL1302-10) Setup Terminal Log on Connect your terminal to the COMM port on the back of the DL3800. Before you can log into the unit, you must make sure that terminal settings match the DL3800. Defaults for the DL3800 COMM port: 9600 Baud rate, no parity, 8 bit word length, 2 stop bits.
1 Network Configuration Set up a port for each T1 line you plan to use. Alarm should be set to REPORT. ACTIVE/RESTORE MODE should be set for Use w/auto restore. Your frame/line code normally will be ESF/B8ZS. Primary clock Xmt = Network (assuming carrier or remote unit providing timing) Primary clock RCV should be set to AUTO. ConÞgure SER to Immediate Confirm and select EXIT. Select Exit again to return to the Main Menu. Save Configuration Select SAVE CONFIGURATION from the Main Menu.
1 1-4 DL3800 DS1 Inverse Multiplexer User Guide—February 1999
Introduction 2 2 SYSTEM OVERVIEW The DL3800 DS1 Inverse Multiplexer bridges the gap between T1 and T3 data services by providing T1 multiplexing of multimegabit (up to 12.224 Mbps) DTE data onto two to eight T1 circuits. The DL3800 Inverse Multiplexer is an economical solution to bandwidth intensive applications as it provides multimegabit data transport without the need for T3 circuits.
2 service, execute the manual restore command on the remote unit Þrst. Then execute the manual restore command on the local unit. Auto restore will not work for lines removed due to excessive delay. The DL3800 supports either High Speed Serial Interface (HSSI) or V.35/RS449 interfaces to the DTE. Extended Superframe (ESF) or D4 framing is supported, as well as AMI or B8ZS line coding. It is compliant with both AT&T Publication 54016 and ANSI T1.403 Facility Data Link requirements.
2 Signal Flow The DL3800 is conÞgured by the user for the number of T1 signals to be used for transmission. The DL3800 will provide a smooth clock to the DTE at the data rate required for the number of T1 outputs the user has conÞgured. For T1, this rate will be Nx1.528 Mbps for B8ZS encoding and Nx1336 Mbps for AMI, where N is the number of T1s to be used (from 1 to 8). The transmit smooth clock PLL can use any of the incoming T1 clocks, an external clock, or internal clock as reference.
2 interface. To allow for jitter and wander speciÞcations, the read address counter will be positioned approximately three frames behind the write address for the network last in time. T1 Port Mismatch Detection When the IMUX T1 circuits synchronize, they use the AT&T 54016 Facility Data Link to communicate which ports (1-8) they are. Ports that are mismatched (that is, not connected to a port with the same number) identify themselves as mismatched and take themselves out of IMUX service.
2 Overhead Functions The overhead functions consist of a controller, front panel, two RS232 communication interfaces (terminal and network management), and a power supply. The controller function is performed by a microprocessor on the main board. The controller collects T1 statistics. It also processes T1 alarms and performance monitoring information, as well as supporting unit conÞguration, test and maintenance activities.
2 DL3800 SYSTEM FEATURES ¥ Advanced Management Capabilities The DL3800 supports a built-in SNMP agent for ease of enterprise wide network management. Also supported is a console port with a userfriendly menu driven interface for local access or remote modem access. Console ports of co-located DL3800s can be daisy-chained together, with no additional hardware required, for single console or modem support of multiple units.
2 APPLICATION The DL3800 DS1 Inverse Multiplexer is designed to transport slightly more than 12 Mbps of data over eight grouped T1 lines. The user can transport large amounts of data without having to move up to more expensive T3 transport, retaining the investment made in T1 technology and equipment. A typical application is shown in Figure 2-3. DL3800 T1 Inverse Multiplexer Router V.
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Installation 3 3 DL3800 INSTALLATION PROCEDURE NOTE: Before beginning the installation process, inspect the DL3800 for damage which may have occurred during shipment. If damage has occurred, notify Digital Link and your package carrier immediately. 1. Unpack and inspect the DL3800 for damage that might have occurred during shipment. If necessary, wipe off the exterior with a soft cloth. Save all packing slips and papers that come with the unit.
3 a. ConÞgure COMM PORT See ÒUnit ConÞgurationÓ on page 4-13 (ASCII terminal) b. ConÞgure NMS (Network Management) Port See ÒSNMP ConÞgurationÓ on page 4-33 (ASCII terminal) 9. ConÞgure Network See ÒNetwork ConÞgurationÓ on page 4-18 (ASCII terminal) 10. ConÞgure DTE See ÒDTE ConÞgurationÓ on page 4-16 (ASCII terminal) MOUNTING THE DL3800 Rack Mounting The DL3800 is shipped with mounting ears attached to the unit ready for rack mounting onto a 19-inch rack.
3 Figure 3-1 DL3800 Rear Panel NOTE: On DC versions of the DL3800, the AC receptacle will be covered with a blank face plate. POWER CABLES AND CONNECTIONS AC Power Connection An AC power cord is supplied with the DL3800 to provide 110 VAC to 240 VAC power, autoranging. The power cord receptacle is located on the rear panel of the DL3800. For AC power, connect the AC power cord to the DL3800, and plug into the nearest AC outlet.
3 Connect the -48 V wire to the screw terminal labeled Ñ. Attach the ReturnÊ(+) wire to the screw terminal to the immediate right, labeled +. Connect earth ground to the ground stud. WARNING: Do not operate the DL3800 without an earth ground connection to the ground stud. The DL3800 is designed to operate with a negative power supply. This means the positive terminal is connected to the ground. WARNING: Damage to the DL3800 may result if power is connected improperly.
3 ASCII TERMINAL AND SNMP CONNECTION The DL3800 is accessed by an ASCII terminal or SNMP Management System workstation through direct, daisy-chained, or dial-up modem connection. On the rear panel of the DL3800, two socket DE-9 receptacles labeled NMS and COMM PORT are provided for connection to the SNMP workstation or ASCII terminal, respectively. An RS-232 straight ribbon cable with DE-9 plug connectors is used to link the DL3800 with the terminal, modem, or workstation.
3 sure to provide a valid IP address to the DL3800. THere can be up to two active telnet sessions at any given time. There is no way for a user to delete the telnet session of another user. Daisy Chaining Multiple DL3800s can be daisy-chained together through the Terminal Port to provide centralized network monitoring and management capabilities. A ribbon-type cable with DB-9 connectors is available from Digital Link for daisy-chaining DL3800s.
Terminal Interface 4 4 LOG IN/LOG OFF Each DL3800 is equipped with an integrated RS-232 ASCII user interface that can be accessed through the COMM PORT (DE-9 connector) located on the rear panel of the DL3800. Through this interface, the user can perform various functions described in this section. When operating in multidrop mode (multiple DL3800s may be daisychained together for centralized network management), the user must log in to establish communication with a single unit on the network.
4 4. To log on to another DL3800 on the same daisy chain, simply type Ctrl-X, followed by a # and the Node Number and press Enter. The previous unit is logged out, and the new unit is logged on. 5. To log off all units without logging onto any new units, press Ctrl-X at the Main Menu. TERMINAL OPERATION OVERVIEW General Menu Flow The menu interface for the DL3800 consists of the Main Menu, and a series of Sub-Menus.
4 Figure 4-1 INVERSE MULTIPLEXER MAIN MENU The product type is a DL3800 Digital Inverse Multiplexer. The software revision is 3.XX, where xx equals the latest software revision. This number is useful to determine the features that are supported with this release. The Node number, in this case 75, is user deÞned. This can be used to further identify the node within the user's network. It is recommended that all nodes be given a unique node number. This is crucial in inter-node communications.
4 INVERSE MULTIPLEXER MAIN MENU COMMANDS When a DL3800 is Þrst powered up, the Main Menu (Figure 4-1 on page 43) appears on the terminal screen. This describes those functions that can be performed, parameters viewed, changed and/or deleted from this menu. The INVERSE MULTIPLEXER MAIN MENU items are shown in Table 4-1. Table 4-1 Main Menu Menu Description Select Local/Remote Allows the user to move between the Main Menu of the Local and Remote units.
4 Figure 4-2 Main Menu with remote unit selected ALARMS AND STATUS The ALARMS AND STATUS MENU is a view only screen that allows the user to review the current ALARMS AND STATUS items being reported by the DL3800. To access this screen, move the highlight bar in the INVERSE MULTIPLEXER MAIN MENU to Alarms And Status and press Enter.
4 Figure 4-3 ALARMS AND STATUS MENU Following are the Alarm and Status items (severity) that may appear. The Common Equipment alarms and status will appear Þrst, followed by the Network and the DTE alarms and status. Table 4-2 Alarms and Status Network Common Equipment DTE Not present External Alarm HSSI Channel Lpbk LOS Proc Restart User Lpbk LOF RAM Test Fail User Loopback AIS det ROM Checksum Fail V.
4 Table 4-2 Alarms and Status (Continued) Network Common Equipment DTE * Active Sync-Net 6 CTS On Not Active Sync-Net 7 RLSD On Excessive Delay Sync-Net 8 TM On Set Code Detected No Net Sync CA On Reset Code Detected LC On CRC Threshold SES Threshold UAS Threshold BPV MN/MJ OOF MN/MJ BPV 15 Min MN/MJ CRCs 15 Min MN/MJ ES 15 Min MN/MJ SES 15 Min MN/MJ UAS 15 Min MN/MJ BPVs 24 Hr MN/MJ CRCs 24 Hr MN/MJ ES 24 Hr MN/MJ SES 24 Hr MN/MJ UAS 24 Hr MN/MJ Terminal Interface 4-7
4 NOTE: If the DL3800 is in Inverse Mux mode and receiving I-Framing on the T1 without Blue, Yellow, or Red Alarms or Major Alarm Thresholds being exceeded, the Alarm & Status display will read ACTIVE. If the T1 Network ConÞguration is set to NEVER USE and a good T1 is connected, the Alarm & Status display will read NOT ACTIVE.
4 To view the performance statistics of any one T1 port, highlight that port and press Enter. The NET STATISTICS for that port (Figure 4-5) will appear on the screen. The NET STATISTICS display presents the current and network performance statistics for the Current 15-minute interval, for the past 24 hours (CUMULATIVE 1) and the 24 hours preceding that interval (CUMULATIVE 2), in 15- minute increments. It also allows the user to clear the display and reset the counters.
4 Figure 4-6 STATISTICS MENU (Screen #2) Table 4-3 STATISTICS MENU Error Types Parameter Definition CV A Code Violation. CV is a count of Frame synchronization bit errors (FE) in the Super Frame (SF) format, or a count of the CRC-6 errors in the Extended Super Frame (ESF) format occurring during the accumulation period. ES An Errored Second. In the case of ESF, the count of one-second intervals containing one or more CRC-6 errors, or one or more CS events, or one or more SEF events.
4 Table 4-3 STATISTICS MENU Error Types (Continued) Parameter Definition UAS This is a count of one-second intervals in which the DS1 path has been unavailable. The DS1 path is determined to be unavailable from the onset of 10 contiguous SESs, or the onset of the condition leading to a failure. CSS The Controlled Slip Second is a count of one-second intervals containing one or more controlled slips.
4 Table 4-4 Alarm Level (Continued) Alarm Parameter Definition Event Code Number designation for type of alarm or status condition. This number will be useful when contacting the factory Description Describes the event To clear the report of all History Events, move the highlight bar to CLEAR HISTORY, and press the Enter key. Figure 4-7 is an example of the EVENT HISTORY MENU.
4 Figure 4-8 CONFIGURATION MENU To access any of the CONFIGURATION SUB-MENUS, highlight the desired item and press the Enter key. The following are samples and descriptions of the Sub-Menus that can be accessed from the CONFIGURATION MENU. Unit Configuration Highlighting Unit and pressing the Enter key accesses the UNIT CONFIGURATION MENU shown in Figure 4-9. The conÞgurable items and options are described in Table 4-5.
4 Figure 4-9 UNIT CONFIGURATION MENU Table 4-5 Node Configuration Options Option Action Date Move the highlight bar to Date, and enter a valid date with the format MM/DD/YY, and press the Enter key. MM:12 month DD:31date YY: 99year Time Move the highlight bar to Time, and enter a valid time with the format hh:mm:ss, and press the Enter key. Alarm Enable Highlight Alarm Enable, and using the Spacebar, toggle between Enabled and Disabled until the desired choice appears.
4 Table 4-5 Node Configuration Options (Continued) Option Action Unit Number Move the Highlight bar to Unit Number, and enter a number between 0 and 9999. Note: Each unit must be set to a different number to allow remote communication, and daisy chaining of multiple units. For example, if the remote unit is set to the same number as the local unit, you will not be able to access the remote unit. Unit Name Move the highlight bar to Unit Name, and press Enter.
4 DTE Configuration This menu allows the user to conÞgure certain parameters of the DTE, including the interface type, clock source, status of leads and loss criteria. To access the DTE CONFIGURATION MENU, move the highlight bar to DTE CONFIGURATION in the CONFIGURATION MENU, and press Enter. Figure 4-10 is an example of the DTE CONFIGURATION MENU, and Table 4-6 describes the menu items.
4 Table 4-6 DTE CONFIGURATION MENU Options (Continued) Parameter Description/Action Clock This item allows the user to enable either the SCT or SCTE leads, and to set the transmit (Tx), and receive (Rx) to Normal or Inverted mode. To set the DTE Clock parameters, use the up and down arrow keys to highlight the configurable Clock items, and use the Space Bar to toggle between the selections until the desired choice appears. The options are SCT or SCTE, Tx Normal or Inverted, and Rx Normal or Inverted.
4 Table 4-6 DTE CONFIGURATION MENU Options (Continued) Parameter Description/Action TM (Test Mode) This allows the user to Assert, DeAssert, or set to Automatic the TM leads. To change or set the TM lead status, use the up and down arrow keys to highlight TM, and use the Space Bar to toggle between Assert, DeAssert, or Automatic until the desired choice appears. Highlight Confirm, and press Enter to confirm the change.
4 Figure 4-11 Network Configuration Screen (DSX-1 Mode) Table 4-7 NETWORK CONFIGURATION MENU Options Parameter Description/Action Alarm This item allows the user to enable (Report) or disable (Mask) the DL3800 from reporting alarms or sending SNMP traps from any of the individual T1 network ports. To change the present Alarm mode, use the up and down arrow keys to highlight the Alarm item in the appropriate line for the desired port, and use the Space Bar to toggle between Report and Mask.
4 Table 4-7 NETWORK CONFIGURATION MENU Options (Continued) Parameter Description/Action Framing Format This allows the user to select either ESF or D4 (SF) as the Framing Format for the individual T1 network ports.
4 Table 4-7 NETWORK CONFIGURATION MENU Options (Continued) Parameter Description/Action JIT (CSU Only) This allows the user to set Jitter Attenuation to either the Transmit (TX) or Receive (RX) side of the line. To change the present Jitter Attenuation side, use the up and down arrow keys to highlight the JIT item in the appropriate line for the desired port, and use the Space Bar to toggle between TX and RX until the desired choice appears.
4 Table 4-7 NETWORK CONFIGURATION MENU Options (Continued) Parameter Description/Action Primary Clock Source This allows the user to select either the Primary Clock Source, transmit (xmt), and receive (rcv) for the individual T1 network ports. To change the present Primary Clock Source, use the up and down arrow keys to highlight either Xmt or Rcv on the Primary Clock Source line, and use the Space Bar to toggle between the choices.
4 Table 4-7 NETWORK CONFIGURATION MENU Options (Continued) Parameter Description/Action Second Error Restoral Interval This item selects the time that a failed T1 line must run without errors in order to be restored automatically. If a network alarm is exceeded for a second time within the selected window (15 minutes or 24 hours), the line will not be restored.
4 To change the number of errored consecutive seconds that will cause that T1 line to go out of service, highlight the appropriate item and press Enter. When the highlight bar is blank, type in the number of seconds desired. NOTE: Default settings are shown in Figure 4-12 The INTERVAL THRESHOLDS section of this menu allows the user to enable or disable the FALLBACK feature.
4 Figure 4-13 SYSYTEM UTILITIES MENU Figure Software Download This selection allows the user to choose the desired mode for upgrading the software revision level of the DL3800 via download if this option is available. Highlight SOFTWARE DOWNLOAD in the SYSTEM UTILITIES MENU, and press Enter. The SOFTWARE DOWNLOAD MENU (Figure 4-14) will appear on the screen. Figure 4-14 SOFTWARE DOWNLOAD MENU To download new software to the DL3800, the following equipment is needed.
4 ¥ Binary Image with Xmodem ¥ Binary Image with Kermit Make the proper RS-232 connection between the PC and the DL3800. A DE-9 connector is pinned out on the DL3800 such that the use of a null modem is not necessary. DE-9 to DB-25 adapters may be needed depending upon the PC used. NOTE: The following steps are recommended before initiating the download process. • Disable all control lead dependencies (RTS, CTS, DCD, etc.) • Enable XON/XOFF flow control.
4 Software Download Options Immediate Software Activation (Enable/Disable) The IMMEDIATE SOFTWARE ACTIVATION mode is controlled from the SYSTEMS UTILITIES/SOFTEWARE DOWNLOAD MENU. When the IMMEDIATE SOFTWARE ACTIVATION feature is enabled, the software download (using MSR, Xmodem, Kermit, TFTP) is immediately activated (that is, copied from RAM to FLASH and rebooted). For consistency with the previous software version, IMMEDIATE=enabled is the default setting.
4 RAM Software Options RAM Software Options - Query RAM Software This feature determines when a valid software image exists in RAM by checking the CRC and image ID. The query indicates if the software can be activated in the unit. This is important if a remote software download is being done from a DL3900 to a DL3800 or the other way around. The following response messages are possible: RAM Image is valid. - CRC is valid, Image ID is valid RAM Image is active - no reboot necessary.
4 TFTP Software Download If immediate software activation is enabled on the target unit, the software is downloaded to the target unit, and is activated by copying the code from RAM to FLASH and then rebooting. A TFTP Software Download server is built into the DL3800. This feature allows the user to do an TFTP transfer (using the SLIP/NMS port) to the unit RAM. The user issues the ÒPutÓ command to the unit to initiate the transfer.
4 To delete the entire unit conÞguration, select DELETE ENTIRE UNIT CONFIGURATION from the SOFTWARE UTILITIES MENU, and press Enter. Use the arrow keys to highlight the Desired Action Þeld. Press the space bar until RESET ENTIRE NODE DATABASE TO FACTORY DEFAULTS appears in the Þeld. The change must then be conÞrmed. Move the highlight bar to CONFIRM, and press the Enter key. Deleting the entire node conÞguration puts all parameters back to their Factory Default Settings.
4 To access the LOGIN CONFIGURATION MENU, move the highlight bar to LOGIN CONFIGURATION in the NODE MAIN MENU and press the Enter key. Figure 4-15 is an example of the LOGIN CONFIGURATION MENU. Figure 4-15 LOGIN CONFIGURATION MENU NOTE: Name and Password are case-sensitive Only those users who are granted "Full Access" class can view or change this screen. The name and password can be any alphanumeric designation up to 16 characters in length.
4 Table 4-8 Login Configuration Options Parameter Description Full Access Class Allows the user to view any menu and perform any function. It is the only access class where the user is allowed to view the LOGIN CONFIGURATION MENU and assign names, passwords, and access levels to users.
4 SNMP Configuration Through the SNMP CONFIGURATION MENU, the user conÞgures the Network Manager (NMS) port on the rear panel of the DL3800, setting various addresses and conÞgurable items required for operation with an SNMP Network Manager. The DL3800 utilizes SLIP protocol over the RS232 port to communicate with the SNMP management station. To access the SNMP CONFIGURATION MENU, move the highlight bar to SNMP CONFIGURATION in the CONFIGURATION MENU, and press Enter.
4 Table 4-9 SNMP Configuration Options (Continued) Option Description/Action Unit IP Subnet Mask The Unit IP Subnet Mask is a 32-bit quantity that identifies which bits in the IP address identify the physical network. The user can specify up to three different IP addresses. To set or change the Unit Subnet Mask, move the highlight bar to Unit Subnet Mask, and enter a 32-bit quantity. Press Enter when finished.
4 Table 4-9 SNMP Configuration Options (Continued) Option Description/Action SNMP Baud Rate This feature selects the SNMP port’s baud rate. To set or change the SNMP port baud rate, move the highlight bar to SNMP Baud Rate, and press the Space Bar to toggle between the options until the desired speed appears. The options are: 300; 600; 1200; 2400; 4800; 9600; 19,200 and 38,400.
4 However, it is important to note that the remote IMUXÕs ÒUnit IP AddressÓ parameter must be set to some non-zero value in order to respond to the bridged IP packets. SNMP trap packets from the remote IMUX unit are modiÞed upon receipt. The source IP address Þeld in the trap packet is modiÞed to the ÒRemote IP AddressÓ parameter; then the packet is forwarded out the NMS/SLIP link.
4 Figure 4-17 is an example of the TESTS MENU. The individual loopbacks and operation of the menu are described below in the text following the menu. Figure 4-17 TESTS MENU To initiate a test, use the CURSOR keys to move the highlight bar to DTE/NETWORK LOOPBACK or a PAYLOAD or LINE LOOPBACK on a selected port. Use the space bar to toggle between OFF and ON until ON appears in the display. When that selection appears in the display, move the highlight bar to CONFIRM, and press the Enter key.
4 Payload Loopback The payload loopback is used to verify proper T1 network operation of the DL3800 and the T1 network. The Payload Loopback loops the payload data received from the T1 network back towards the network. The data is regenerated, and a new framing pattern is inserted prior to being looped back. In this way the T1 framing of the unit and network can be veriÞed. Line Loopback The line loopback is used to verify the operation of the T1 network.
4 Manual Network Restoration The DL3800Õs T1 ports are normally set to auto restore. However, you may choose to individually restore T1 networks after they fail, through the MANUAL NETWORK RESTORATION MENU. NOTE: Manual restore will only work under the following conditions: 1. If the port has previously been set to ÒUse w/manual restore,Ó in the Network ConÞguration screen. 2. If the T1 is not in alarm. If the T1 is in alarm, you must Þrst clear the alarm statistics in the STATISTICS MENU.
4 Logout This allows the user to manually logoff the unit, instead of waiting for the provisioned automatic logoff time for the unit to logoff automatically. Highlighting LOGOUT and pressing Enter logs the user off the system.
5 Front Panel Interface 5 GENERAL The front panel features a 16 character vacuum ßuorescent display and four buttons that help the user to move through the various menus to conÞgure the unit, perform tests, and obtain vital performance data. The front panel also features six LEDs for the DTE port, one for each of the T1 networks, three for the DL3800 status and one for Network Test. DISPLAY OVERVIEW The DL3800 has a 16-character ßuorescent front panel display.
5 BUTTON OVERVIEW The DL3800 has four front panel buttons. The unit generally responds to a button when it is pressed. Pressing and holding a button results in a repeating action after one-half second. END TEST EXIT ENTER The front panel buttons are also used for Alarm Cutout. When an alarm condition occurs, the External Alarm Output contacts close. This typically actuates external alarm indicators such as bells or alarm lights.
5 Front Panel LEDs Table 5-1 Front Panel LEDs Indication Description Test Test In Progress LED Off No tests are in progress. Solid Red A test condition exists. Data Port LEDs TD Data DTE Activity LED. Represents pulses from DTE. Green Pulses are being detected. Off No pulses are being detected. RD Date DTE Activity LED. Represents pulses from DTE. Green Pulses are being detected. Off No Pulses are being detected. RTS Request to send indicator, from DTE.
5 Table 5-1 Front Panel LEDs (Continued) Indication Description Yellow Network is in Loopback. Flashing Yellow Receiving yellow/AIS alarm. Unit LEDs: Status Maj Min Display the status of the DL3800E, and whether the condition is a Major or Minor alarm. When a port’s Active/Restore mode is set to Never Use and its alarm mode is set to Mask, then the activity LED will be turned off. Access Levels And Protected Mode Front panel access can be limited by placing the DL3800 in the Protected Mode.
5 Protected Mode is ignored in the Þrst sixty seconds after powering the unit up. When in Protected Mode, the Test Menu does not appear in the Main Menu as a choice. POWER UP AND RESET During power up initialization, the unit performs self test and displays a self-test message. Payload service resumes at the completion of Self Test. When the Self Test message is removed, the default message DL3800 Inverse Multiplexer appears on the display.
5 DL3800 Inverse Mux ENTER EXIT SELECT REMOTE Select Remote/Local EXIT ENTER EXIT DISPLAY Display Menu EXIT EXIT ENTER TEST Test Menu EXIT ENTER EXIT CONFIGURATION Figure 5-1 EXIT Configuration Menu Front Panel Top Level Menu This menu loop may also be entered at any time by pressing the EXIT button to go up the menu hierarchy until reaching the Top Menu.
5 The ConÞguration Menu is used to view and change the unit's conÞguration parameters, date and time, network interface parameters, and DTE interface parameters. Both the Monitor and ConÞguration Menus are also able to access the remote unit. Remote monitoring and conÞguration are only available when there is an ADL (Application Data Link) channel to the remote unit.
5 DISPLAY MENU ENTER NODE STATUS EXIT EXIT Use Arrow keys to view status. ENTER DTE STATUS EXIT EXIT Use Arrow keys to view status. ENTER NET 1 STATUS EXIT EXIT ENTER NET 2 STATUS EXIT EXIT Use Arrow keys to view status. Use Arrow keys to view status. ENTER NET 1.STATISTICS EXIT EXIT ENTER NET 2.STATISTICS EXIT Use Arrow keys to view statistics. Use Arrow keys to view statistics.
5 If one of more errors are detected, one or more of the following messages will appear. Use the up and down arrow buttons to view the following messages, see Table 4-2 on page 4-6 of this Users Manual for a list of those Common Equipment Alarm and Status items that could appear in this menu. DTE Status The next display shows the status of the DTE data port. The Menu is accessed by pressing ENTER when DTE STATUS appears in the display.
5 Table 5-2 NET Statistics Menu Information Display (Continued) Front Panel Display Explanation SEC YYY VALID. Z YYY = the number of seconds into the current interval. Z = the number of valid 15 minute intervals since the error counters were reset (0 through 96). CUR. X X = the current interval. TOTL. X X = the number of errors in the current interval.
5 Table 5-3 NET Statistics Items (Continued) Parameter Definition SAS In ESF only, this parameter is the count of one-second intervals containing one or more SEF defects or one or more AIS (Alarm Indication Signal) defects. AISS This parameter is a count of one-second intervals containing one or more AIS defects. UAS This is a count of one-second intervals in which the DS1 path has been unavailable.
5 The Test Menu is broken down into two types of sub-menus: DTE TESTS (one menu) and NETWORK TESTS (one for each network interface installed). Through these Sub-Menus, the user initiates and stops various tests and loopbacks. The TEST Menu is accessed from the Main Menu by pressing ENTER when TEST appears in the display. Pressing the down or up arrow toggles through the three sub-menus. The Sub-Menus are accessed by pressing ENTER when the appropriate menu appears in the display.
5 NOTE: A menu item will appear only for those T1 network interfaces. installed. DTE TESTS Only one loopback can be initiated through the DTE TESTS Menu, a bidirectional DTE/NET Loopback. To access the DTE TESTS Menu from the TEST Menu, press ENTER when DTE TESTS appears in the display. When in the DTE TEST Menu, pressing ENTER accesses the DTE/NET Loopback.
5 of the Test Menu and then, using the other buttons, go into the Monitor or the ConÞguration Menus to view the performance information or view and change the conÞguration of the unit while the test is in progress. While the test is active, the front panel TEST LED is on, reminding the user that the unit is out of normal service condition. The test is terminated by pressing the END TEST button combination at any point in the menus.
5 Line Loopback The network loopback is used to verify the operation of the T1 network connection (T1 through T8). The network loopback loops the data received from the T1 network back towards the network. The data is regenerated prior to being looped back, however, no additional processing of the data is performed by the DL3800. This minimizes the impact of the DL3800 during this test so that the problems can be isolated.
5 The DL3800 conÞguration can only be changed when the unit is not in the Protected Mode. In Protected Mode the conÞguration can only be viewed but not changed. To use the CONFIGURATION MENU, the user selects the CONFIGURATION SUB-MENU from a hierarchical list, and presses the ENTER button. The user then proceeds through the hierarchical menu structure to view or change the chosen parameters. When the user is done using the CONFIGURATION MENU, the EXIT button is pressed.
5 Table 5-4 CONFIGURATION MENU Items (Continued) Menu Definition Backup Database Used to manually back-up the database to EEPROM DTE CONFIG MENU Used to set the line mode for the DTE DATA port. It is also used to define whether the DTE signal is defined missing when the DTR and the RTS line is not asserted. Other options include DTE/DCE mode, V.
5 conÞrm each change. The next letter or number space will then begin "blinking" and be available for change. To abort any change, press EXIT before you press ENTER .
5 The NODE CONFIGURATION MENU is used to conÞgure various parameters of the DL3800, including: Table 5-5 NODE CONFIGURATION MENU Items Parameter Definition Unit ID The Unit ID is an alphanumeric designation up to 16 characters in length. The unit is shipped without a Unit ID. To access Unit ID from the NODE CONFIGURATION MENU, press ENTER when Unit ID appears in the display. Press ENTER again, and the first space or letter will begin blinking.
5 Table 5-5 NODE CONFIGURATION MENU Items (Continued) Parameter Definition Local Terminal XON/XOFF With the Flow Control feature On, the terminal can request that the DT quit sending data when its buffers are full. The choices are Use or Ignore XON/XOFF Terminal Multidrop If the local terminal is connected to more than one DL3800, it must be in Multidrop Mode. If it is connected to only one unit, this feature can be disabled.
5 COMM PORT CONFIG EXIT ENTER BAUD RATE 9600 Arrow keys change baud rate BAUD RATE 9600 EXIT EXIT ENTER PARITY EVEN EXIT Arrow keys change parity PARITY EVEN EXIT EXIT ENTER DATA BITS 8 ENTER STOP BITS 2 Arrow keys change length of data bits DATA BITS 8 Arrow keys change stop bits STOP BITS 2 EXIT ENTER EXIT ENTER USE XON/XOFF ENTER EXIT EXIT EXIT ENTER EXIT EXIT EXIT ENTER ENTER USE XON/XOFF EXIT EXIT ENTER ENTER MULLTIDROP MODE MULTIDROP MODE EXIT EXIT To node confi
5 DTE Configuration Menu This menu allows the user to set various conÞgurable items for the DTE port. For each item on this menu, pressing the ENTER button causes the conÞgurable item to start ßashing. Pressing the up arrow and down arrow buttons changes the value of the ßashing item. Pressing the ENTER button again terminates the conÞguration of that item. Pressing the EXIT button aborts the operation without making the change.
5 NETWORK CONFIGURATION Menu EXIT ENTER INVERSE MUX EXIT EXIT INVERSE MUX Up and Down arrow buttons change operating mode between Inverse Mux and Single T1 DSU. PRI TX CLK INT Up and Down arrow buttons change Primary TX Clock source between Internal, External and Network. PRI RX CLK NET 1 Up and Down arrow buttons change Primary RX Clock source between NET1 - NET 8 and Automatic (AUTO).
5 NET N (DSX) CONFIGURATION Menu EXIT ENTER NET ESF EXIT EXIT NET ESF Up and Down arrow buttons change framing to D4 and ESF NET AMI Up and Down arrow buttons change line code between AMI and B8ZS ALARM MASK Up and Down arrow buttons change between Alarm Mask and Alarm Report.
5 The user can set the threshold value for Minor (MI) and Major (MJ) alarms, where exceeding the Minor alarm threshold will generate an alarm report and the exceeding a Major alarm threshold will actually cause a T1 line to be automatically taken out of service.
5 Table 5-6 NET THRESHOLD Options and Values (Continued) OPTION VALUE 24.HR.MI.CRCS 10 24.HR.MJ.CRCS 10 24.HR.MJ.CRCS OFF 24.HR.MI.ES 10 24.HR.MJ.ES 10 24.HR.MJ.ES OFF 24.HR.MI.SES 10 24.HR.MJ.SES 10 24.HR.MJ.SES OFF 24.HR.MI.UAS 10 24.HR.MJ.UAS 10 24.HR.MJ.UAS OFF To turn a Major Alarm ON or OFF, use the Up and Down arrows to get the speciÞc alarm in the display window and press ENTER . Using the arrow buttons, select ON or OFF.
Diagnostics 6 6 EQUIPMENT RETURN AND REPAIR If faulty equipment is suspected, perform the tests in this section. If, after performing these tests, the DL3800 or any associated module is suspected to be faulty, call Digital Link Technical Support at (408) 745-4200. RUNNING DIAGNOSTIC TESTS You should test the DL3800 before you use it. If it, or an associated module, does not operate properly during or after testing, call Digital Link Technical Support at: (408)Ê745-4200.
6 Figure 6-1 TESTS MENU NOTE: The following 3 tests interrupt payload traffic to the unit. DTE/Network Loopback Test Use the DTE/NETWORK Loopback test to verify the data port and associated cabling. This bi-directional loopback loops the received data port signal back to the data port and the received T1 processor signal back to the T1 network. It can test a problem whose source is the T1 line.
6 Payload Loopback and Line Loopback Tests Use the PAYLOAD Loopback and LINE Loopback tests to verify the proper operation of the DL3800 and selected T1 networks. Both tests loop the payload data received from the T1 network back to the network. With the PAYLOAD Loopback, the DL3800 regenerates the data and inserts a new framing pattern before it loops back the data. This veriÞes the unitÕs T1 framing and the T1 network.
6 It is also possible to verify the path from the DTE through the T1 line to the remote-end DL3800, provided the DTE equipment can generate and detect looped back bit streams. These suggestions can help determine which portion of the network might be at fault. When discovering a failure, check the simple solutions Þrst.
6 Table 6-1 Troubleshooting (2 of 5) Problem Solution The NETWORK T1 port LED’s on the DL3800 never illuminate. Make sure the T1 cable from your service provider is connected to the DL3800. Remove the T1 cable from the affected T1 port, and hardloop the interface by connecting pins 1-3 and 9-11 of the DB-15 port. If the T1 LED lights up, check your T1 cabling, and contact your service provider. The NETWORK T1 LEDs on the DL3800 are constantly red.
6 Table 6-1 Troubleshooting (3 of 5) Problem Solution The NETWORK T1 LEDs on an DL3800 are flashing green. Make sure a valid DTE device is connected to the DL3800, and is powered on. If no DTE device is connected and the unit is configured for V.35 or RS449, make sure that DTE LOSS is set to None. If the unit is configured for HSSI, check for a valid HSSI signal (TA and DTR). If a DTE device is connected, make sure all DTE port LEDs are on.
6 Table 6-1 Troubleshooting (4 of 5) Problem Solution The connected DTE device shows intermittent errors. Run a DTE/NET Loopback to verify the physical connection between the local DTE device and the DL3800. If errors are reported during this loopback, check the DTE cable. Make sure the DTE device supports the DTE port clocking option. Use SCTE clocking for the DTE device if the application is using V.35, and the DL3800 has more than four connected T1 circuits.
6 Table 6-1 Troubleshooting (5 of 5) Problem Solution You cannot access the DL3800 from a terminal. The terminal must be running a VT100 or compatible terminal emulation program. Make sure you are using a straight through cable with pin 8 CTS cut at the terminal end. Make sure the Comm Port parameters match the terminal’s, and the DL3800 has a unique ID. If the DL3800 is in a daisy-chain, you can display a roll call of all unit numbers by pressing Ctrl-x five times.
SpeciÞcations A A T1 NETWORK INTERFACE Parameter Setting Interface Type DSX-1 Standard T1 CSU Optional Number of Ports 2, 4, 6 or 8 Framing Formats D4 or ESF ESF FDL Protocols AT&T 54016 ANSI T1.403 Line Code AMI or B8ZS Transmit Line Rate 1.544 Mbps ± 50 ppm Receive Line Rate 1.544 Mbps ± 135 ppm Synchronization Internal, Loop-timed, or External Network Connector DB-15 Socket EXTERNAL CLOCK INTERFACE Parameter Setting Rate 1.
A DTE INTERFACE Item Interface Electrical Interface HSSI or V.35/RS-449 Rate Up to 12.224 Mbps Connector Types DB-25 Socket (V.
A FRONT PANEL Item Interface Display 16 Character Alphanumeric Key Pad Four Keys DTE Status LEDs TD, RD, RTS, CTS, DTR, network data/test, T1-1 through T1-8, status, MAJ alarm, MIN alarm Item Interface Loopbacks DTE/Network, Payload, Line, Local Self Test Checks Unit Circuitry and Memory on power up Alarms Relay, dry contact DIAGNOSTICS POWER Power Setting AC Input 110 VAC, 0.5 A Max to 240 VAC, 0.
A ENVIRONMENTAL Item Temperature Operating Temperature 0oC to 50oC Storage Temperature -20oC to 60oC Relative Humidity 0 to 95% Non-Condensing Altitude -200 ft to 13,500 ft (-60.1 m to 4.1 m) above sea level PHYSICAL /CONNECTORS Item Dimensions Mounting 19-inch or 23-inch rack mounting or Standalone Dimensions 17.2 in W x 2.8 in H x 11in D (43.7 cm W x 7.1 cm H x 27.
Pinouts B B TERMINAL CONNECTION Table B-1 COMM and NMS Port Pin Assignments PIN SIGNAL 2 SD Send Data to Terminal 3 RD Receive Data from Terminal 8 CTS Clear to Send to Terminal (Connect between units, but not to the Terminal) 5 SG Signal Ground (Bidirectional) DTE CONNECTORS Table B-2 HSSI DTE Connector Pin Assignments PIN # DIRECTION +SIDE PIN # - SIDE SG Signal Ground — 1 26 RT - Receive Timing To DTE 2 27 CA - DCE Available To DTE 3 28 RD Receive Data- To DTE 4 29 Rese
B Table B-2 SIGNAL LALoopback Circuit A HSSI DTE Connector Pin Assignments (Continued) PIN # DIRECTION +SIDE From DTE PIN # - SIDE 10 35 SDSend Data From DTE 11 36 LB Loopback Circuit B From DTE 12 37 SGSignal Ground — 13 38 5 ancillary to DCE From DTE 14-18 39-43 SGSignal Ground 5 ancillary from DCE — 19 44 5 ancillary from DCE To DTE 20-24 33-49 SGSignal Ground — 25 50 Table B-3 B-2 DB-25 to V.35 DTE Connector Pin Assignments TWISTED PAIR V.
B Table B-3 DB-25 to V.35 DTE Connector Pin Assignments TWISTED PAIR V.
B Table B-4 DB-25 to RS-449 DTE Connector Pin Assignments TWISTED PAIR RS449 DB25 BLK BLU 19 NC 7 NC DRAIN 1 NC T1 NETWORK PIN ASSIGNMENTS The network connector is a DA-15 connector. The assignments for the Network connector are given below.
B Table B-6 DB-25 to DE-9 Pinouts DB9 DB25 5 7 1 8 9 23 4 21 External Clock Connector Pin Assignments A DE-9 connector is provided on the DL3800 rear panel for connection to an External Clock. Pin Assignments for the External Clock connector are as follows: Table B-7 External Clock Pinouts PIN SIGNAL 1 Signal A 2 Signal B 5 Shield 3,4,6,7,8,9 No Connection Per RS-422 requirements, the receiver has an input sensitivity of 200 mV over the input voltage range of ±7 V.
B DTE Clock Rates Table B-8 NETWORKS B8ZS AMI B-6 DTE Clock Rates DTE CLOCK RATE, MBPS 1 1.528 2 3.056 3 4.584 4 6.112 5 7.640 6 9.168 7 10.696 8 12.224 1 1.336 2 2.672 3 4.008 4 5.344 5 6.680 6 8.016 7 9.352 8 10.
Factory Default Settings C C Table C-1 Unit Settings Unit Setting ALARM ENABLE Disabled AUTOMATIC BACKUP 5 minutes after each database change FRONT PANEL On UNIT NUMBER 0 TERMINAL BAUD RATE 9600 TERMINAL PARITY & BITS 8 bits, No parity TERMINAL STOP BITS 2 XON/XOFF Enabled MULTIDROP Enabled Table C-2 DTE Settings DTE Setting DTE INTERFACE V.
C Table C-3 Network Settings Network Setting ALARM Mask ACTIVE/RESTORE MODE Never Use FRAME ESF LINECODE B8ZS EQUALIZATION 0'-132" FDL Enabled SET/RESET Enabled PRIMARY CLOCK SOURCE Xmt Int. Rcv Net 1 SECONDARY CLOCK SOURCE Xmt Int.
C Table C-5 SNMP Configuration Settings SNMP Configuration Setting WRITE COMMUNITY STRING Public TRAP COMMUNITY STRING Public SNMP BAUD RATE 9600 BITS & PARITY 8 bits, No parity STOP BITS 2 Table C-6 Test Settings Tests Setting ALL LOOPBACKS & TESTS Off Factory Default Settings C-3
C C-4 DL3800 DS1 Inverse Multiplexer User Guide—February 1999
G Glossary G ABAM A designation for 22 gauge, 110 ohm, plastic insulated, twisted pair Western Electric cable normally used in central ofÞces. AIS (Alarm Indication Signal) An unframed sequence of All Ones normally sent by a DSU/CSU that cannot maintain the required pulse density in AMI mode or sent by a CSU that has a loss of signal condition on its data port. The signal is sent to maintain continuity of transmission and to notify the far-end that a transmission fault exists on the line.
G bandwidth The data-carrying capacity of a transmission medium, usually measured in Hertz (Hz), which equals cycles per second. baud A measurement of the signaling speed of a data transmission device. BER See bit error rate. BES (Bursty Errored Seconds) Occurs when a second has 320 or more CRC violations.
G C CCITT International Telegraph and Telephone Consultative Committee. central ofÞce (CO) The phone company switching facility or center; usually a Class 5 end ofÞce, at which subscribers' local loops terminate. channel A physical or logical path allowing the transmission of information; the path connecting a data source and receiver. circuit Generally referring to a transmission medium connecting two or more electronic devices.
G CRC (Cyclic Redundancy Check) An error checking scheme used to check the received data. The CRC bits within the framing are calculated using the contents of the frame. The calculation is performed again when the frame is received and the CRC values are compared. If they do not match, the frame is considered bad and the CRC statistic is incremental. Performance checking is done by both the carrier and the customer without causing any interference with the T-1 trafÞc.
G DCE (Data Circuit-Terminating Equipment) Equipment that is either a part of the network, an access point to the network, a network node, or equipment at which a network circuit terminates. dial-up Describing the process of, or the equipment or facilities involved in, establishing a temporary connection via the switched telephone network.
G DSU/CSU (Data Service Unit/Channel Service Units) The pair of communications devices that connect an in-house line to an external digital circuit. At the customer's end of the telephone connection, the DSU/CSU takes data from terminals and computers, encodes it, and transmits it down the link. At the receive end, another DSU/CSU equalizes the received signal, Þlters it, and decodes it for interpretation by the end-user.
G ESF (Extended Superframe Format) A new T1 framing standard used in Wide Area Networks (WANs). With this format 24 frames, instead of 12 are grouped together. ESF provides frame synchronization, cyclic redundancy checking and data link bits in overhead. It allows more information to be stored and retrieved easily, facilitating network performance monitoring and maintenance. F failed signal state Occurs when ten consecutive severely errored seconds are detected.
G frame ground A metallic layer acting as a shield, consisting of tape, braid, wire or sheath and surrounding insulated conductors in cable. It may be the metallic sheath of the cable or the metallic layer inside a nonmetallic sheath. It reduces stray electrical Þelds, prevents outside electrical interference, drains off current induced by lightning and provides for safety of personnel. frequency The number of repetitions per unit time of a complete waveform.
G LOS (Loss of Signal) Occurs when an input signal is detected as all zeros for 176 bit times. loss A reduction in signal strength, expressed in decibels. LSC (Loopback Select Code) An indicator describing a DSU loopback characteristic. LSC is a minimum of 35 LSC bytes of S11101F1 with secondary channel. LT (Local Test) A data port signal to DSU/CSU. M mask Refer to subnet mask. MIB (Management Information Base) A structure that deÞnes what is obtainable from a network device and what can be controlled.
G network An interconnection of computer systems, terminals, or data communications facilities. NI (Network Interface) The point of demarcation between the customer premises and the carrier's network, usually drawn at the network connector on the rear panel of the Digital Link access device. NRZ (Non-Return to Zero) A binary encoding and transmission scheme where ÒonesÓ and ÒzerosÓ are represented by opposite, and alternating, high and low voltages.
G R RD (Receive Data) A data port signal. receiver The receiver synchronizes the framing pattern, separates the frame bits from the payload data and monitors for frame errors in 64 kbps mode. It achieves frame synchronization within 5 milliseconds. repeater Equipment that receives a pulse train, ampliÞes it, retimes it, and then reconstructs the signal for retransmission. return to zero Method of transmitting binary information such that, after each encode bit, voltage returns to the zero level.
G S SCR (Serial Clock Receive) A unipolar clock from the DCE signal. A data port signal. SCT (Serial Clock Transmit) A unipolar clock from the DCE signal. A data port signal. SCTE (Serial Clock Transmit External) The clock signal is echoed from the DTE for the purpose of timing incoming data on long cable runs. scrambler A device or software program that encodes data for encryption. It distorts a voice or data conversation so that only another like device can Þgure out the content of the message.
G SNMP (Simple Network Management Protocol) A widely-used network monitoring and control protocol. Data is passed from SNMP agents (hardware and/or software processes reporting activity in each network device, hub, router, bridge, etc.) to the workstation console used to oversee the network. The agents return information contained in a MIB (Management Information Base), which is a structure that deÞnes what is obtainable from the device and what can be controlled.
G TRAP A mechanism by which a device automatically sends an alarm for certain network events to a management station. The management station can initiate a polling sequence to the device to determine the cause of the problem. U UAS (Unavailable Seconds) Number of seconds elapsed after 10 consecutive SES events are received (ESF framing only). V V.35 A CCITT standard for the trunk interface between a network access device and a packet network. It deÞnes signaling for data rates greater than 19.2 Kbps. V.
