Owner’s Manual P/N 82034802Rev.C Model MT64DSU This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-Tech Systems, Inc. All rights reserved. Copyright © 1998 by Multi-Tech Systems, Inc. Multi-Tech Systems, Inc. makes no representation or warranties with respect to the contents hereof and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech Systems, Inc.
Contents Chapter 1 - Introduction and Description Introduction ................................................................................ 6 About This Manual ..................................................................... 7 DSU Basic Functions ................................................................. 8 DSU Functions ..................................................................... 8 CSU Functions .....................................................................
Chapter 4 - Warranty, Service and Tech Support Introduction .............................................................................. 32 Limited Warranty ...................................................................... 32 On-line Warranty Registration .................................................. 32 Tech Support ............................................................................ 33 Recording MultiDSU64K Information ................................. 33 Service 34 The Multi-Tech BBS .
MultiDSU64K Chapter 1 - Introduction and Description
MT64DSU Owner's Manual Introduction Welcome to Multi-Tech's new MultiDSU64K a stand-alone integrated Data Service Unit (DSU), model number MT64DSU, for accessing 4wire switched or dedicated digital links (Figure 1-1). The MultiDSU64K is a compact easy to operate unit with features allowing flexibility in meeting your transmission requirements. The unit operates with 56 Kbps DDS (Digital Data Services) or switched 4-wire networks or compatible digital data services, and 64 Kbps dedicated 4-wire services.
Chapter 1 - Introduction and Description About This Manual This manual describes the MultiDSU64K and explains how to install and cable the unit. The information contained in each chapter is as follows: Chapter 1 - Introduction and Description This chapter provides an overview of DSU/CSU basics, information on power, front panel indicators, back panel connectors, and a list of the relevant technical specifications.
MT64DSU Owner's Manual DSU Basic Functions A DSU (Data Service Unit) and a CSU (Channel Service Unit) are typically connected to provide the interface between DTE (Data Terminal Equipment) and the DDS (Digital Data Service) or other four-wire networks. A DSU converts data to a bipolar format for transmission over the digital line. The CSU terminates the user's digital circuit, does the line conditioning, provides FCC Rules compliance, and handles the CO (Central Office) loopback commands.
Chapter 1 - Introduction and Description Front Panel Indicators The MultiDSU64K has seven diagnostic LED indicators. They are: ® SD Send RD CD DSU64K CTS RTS OL TM Multi-Rate DSU-CSU R C V C a r r i e r C l e a r R e q u e s t O n L i n e Te s t Figure 1-3. LED Indicators SD Transmit (Send) Data: This LED blinks when data is being transmitted, on for a space, off for a mark. RD Receive Data: This LED blinks when data is being received, on for a space, off for a mark.
MT64DSU Owner's Manual Back Panel The cable connections for the MultiDSU64K are made at the back panel. The input data (DCE interface) is through either an RS-232 or V.35 connection; and, theDDS network connection is through an RJ48S line jack. LINE EIA RS232C ON OFF POWER Figure 1-4. Back Panel Connectors RS-232C Connector The RS-232C connector is used to connect the MultiDSU64K to a computer or DTE device. V.35 Connector The V.
Chapter 1 - Introduction and Description Features Your Multi-Tech DSU/CSU provides the following features: • supports direct connection to the DATAPHONE Digital Data Service (DDS) or compatible network; • selectable sync speeds of 9600, 19200, 56000 for 4-wire lines and 64000 bps for 4-wire dedicated lines; • selectable async speeds of 9600, 19200, 38400 and 57600 bps; • Standard RS-232C, V.
MT64DSU Owner's Manual Technical Specifications 12 • Interfaces RS-232C V.35 DDS DB25S (female) 34-pos. rectangular (female) RJ48 8-position keyed jack • Power Requirements 117V AC, 50-60 Hz, 10 Watts • Temperature 0 to 50 degrees C • Humidity 95% (non-condensing) • Dimensions 1.38" H x 6.15" W x 9" D (3.5 cm x 15.6 cm x 22.9 cm) • Weight 2 Lbs. (.9 Kg.) without power transformer 2.7 Lbs. (1.2 Kg.
MultiDSU64K Chapter 2 - Installation and Cabling
MT64DSU Owner's Manual Introduction This chapter provides information for configuring and cabling the MultiDSU64K. It is assumed that the reader is familiar with the function and operation of data communications equipment and is technically qualified to provide installation service. Unpacking The shipping box contains the MultiDSU64K, an RJ48S line cord, a DSU Loopback cable, an AC Power Transformer and an Owner’s Manual.
Chapter 2 - Installation and Connection Cabling Procedure Installation of the MultiDSU64K includes making the proper cable connections and turning power on. LINE EIA RS232C ON OFF POWER Figure 2-1. MultiDSU64K Back Panel Perform the following procedure to install your MultiDSU64K. 1. Verify that the Dip-Switches on the MultiDSU64K are set for your particular configuration. 2. Connect the appropriate MultiDSU64K back panel DTE interface connector, depending on the DTE: 3.
MT64DSU Owner's Manual DIP Switch Settings The MultiDSU64K printed circuit board contains one 12-position DIP-Switch block and one 4-position DIP-Switch block as shown in Figure 2-2. They are located on the side of the circuit board, and are accessible through the side of the chassis. Each individual switch is numbered, and can be in either an up (OPEN) or down (CLOSED) position. Figure 2-2.
Chapter 2 - Installation and Connection Switches #1 and #2 Speed Switches (Synchronous Mode) DIP-Switches #1 and #2 are used to set the synchronous data rate. Switches #1 and #2 are used in combination, to select the desired speed in your application. Note that first the asynchronous/ synchronous option must be chosen via DIP-Switch #5.
MT64DSU Owner's Manual DDS clocking (default) allows the MultiDSU64K to accept timing signals from the DDS network’s receive bipolar signal. Use this selection whenever the MultiDSU64K is connected to the DDS network lines.
Chapter 2 - Installation and Connection Switch #7 Data Set Ready "DSR" (Asynchronous/Synchronous Mode) When this option is enabled, the MultiDSU64K forces the DSR signal on continuously. The continuous DSR signal is used to eliminate momentary link interruptions that may be interpreted by the DTE as a communications channel failure.
MT64DSU Owner's Manual Elastic Store Enabled Elastic Store Disabled (Factory Default Setting = = = Switch #12 UP Switch #12 DOWN DOWN) Switch #13 This switch must be in the DOWN position. Switch #14 Dedicated/Switched Line Operation (Asynchronous/Synchronous Mode) The MultiDSU64K works over either Dedicated or Switched lines. Note you must have this switch positioned in Switched Line mode (UP) in order to issue AT Commands.
MultiDSU64K Chapter 3 - Testing
MT64DSU Owner's Manual Diagnostic Tests The MultiDSU64K is set to a default of Normal (non-diagnostic) mode at the factory. When a failure occurs in the digital facility (DDS circuit), the network detects the failure. Your equipment can detect failure by the absence or distortion of the digital signal. If the remote equipment is not transmitting properly, contact your telephone company. If the telco is required to perform remote tests, the channel will be temporarily interrupted and loss of data may occur.
Chapter 3 - Testing Local Loopback Test This test allows you to test the local DTE and the local MultiDSU64K. Use the following steps to perform the Local Loopback Test. 1. Set DIP-Switch #8 to the UP position. 2. The front panel Test (TM) LED lights, and if you send data from your DTE, it should be “looped back” to your DTE. If you have access to a Bit Error Rate Tester, this can be used in place of the DTE. Figure 3-2.
MT64DSU Owner's Manual Digital Loopback Test This test allows you to test the local DTE, the local MultiDSU64K, the communications link, and the remote MultiDSU64K. Use the following steps to perform the Digital Loopback Test. 1. Set DIP-Switch #9 on the remote MultiDSU64K to the UP position. 2. The front panel Test (TM) LED lights, and if you send data from the local DTE, it should be looped back to the local DTE.
Chapter 3 - Testing Local Loopback Test With Test Pattern This test allows you to test the local MultiDSU64K. Perform the following steps to enable this test: 1. Set DIP-Switch #8 to the UP position. 2. Set DIP-Switch #11 to the UP position. 3. The front panel (TM) LED lights, and if errors are detected, the Carrier Detect LED blinks. Figure 3-4.
MT64DSU Owner's Manual Digital Loopback Test With Test Pattern Test This test allows you to test the local MultiDSU64K, the communications link, and the remote MultiDSU64K. Use the following steps to perform the Digital Loopback Test with the Pattern Test. With this test enabled, the MultiDSU64K sends and detects a predefined 511-bit pseudo-random test pattern. When an error is detected by the MultiDSU64K, the CD (Carrier Detect) LED flashes. 1.
Chapter 3 - Testing Remote Loopback Test This test allows you to test the local DTE, the local MultiDSU64K, the communications link, and the remote MultiDSU64K. Use the following steps to perform the Remote Loopback Test. 1. Set DIP-Switch #10 on the local MultiDSU64K to the UP position. 2. The front panel Test (TM) LED lights, and if you send data from the local DTE, it should be looped back to the local DTE. If you have access to a Bit Error Rate Tester, this can be used in place of the local DTE.
MT64DSU Owner's Manual Remote Loopback Test With Test Pattern Test This test allows you to test the local MultiDSU64K, the communications link, and the remote MultiDSU64K. Use the following steps to perform the Remote Loopback Test with the Pattern Test. With this test enabled, the MultiDSU64K sends and detects a predefined 511-bit pseudo-random test pattern. When an error is detected by the MultiDSU64K, the CD (Carrier Detect) LED flashes. 1.
Chapter 3 - Testing DSU Back-to-Back Test This test lets you connect two DSUs with a back-to-back cable to verify proper DSU operation. Using a DSU that is known to be operational, you can test a second DSU that is suspect. 1. Obtain a DSU Back-to-Back cable (#45050000) from Multi-Tech, or assemble one. Refer to Appendix B for instructions on building the Back-to-Back cable. 2. Plug the cable into each DSU’s LINE jack. 3. On the “good” DSU, set DIP switch #9 to the UP position. 4.
MT64DSU Owner's Manual 30
MultiDSU64K Chapter 4 - Warranty, Service and Tech Support
MT64DSU Owner's Manual Introduction This chapter starts out with statements about your MultiDSU64K's two-year warranty. The next section, Tech Support, should be read carefully if you have questions or problems with your MultiDSU64K. It includes the technical support telephone numbers, space for recording your MultiDSU64K information, and an explanation of how to send in your MultiDSU64K should you require service.
Chapter 4 - Warranty, Services, and Tech Support Tech Support Multi-Tech has an excellent staff of technical support personnel available to help you get the most out of your Multi-Tech product. If you have any questions about the operation of this unit, call 1-800972-2439. Please fill out the MultiDSU64K information (below), and have it available when you call. If your MultiDSU64K requires service, the tech support specialist will guide you on how to send in your MultiDSU64K.
MT64DSU Owner's Manual Service If your tech support specialist decides that service is required, your MultiDSU64K may be sent (freight prepaid) to our factory. Return shipping charges will be paid by Multi-Tech Systems). Include the following with your MultiDSU64K: • a description of the problem. • return billing and return shipping addresses. • contact name and phone number. • check or purchase order number for payment if the MultiDSU64K is out of warranty.
Chapter 4 - Warranty, Services, and Tech Support To log on to the Multi-Tech BBS 1. Set your communications program to 8-N-1. 2. Dial our BBS at (800) 392-2432 (USA and Canada) or (612) 785-3702 (international and local). 3. At the prompts, type your first name, last name, password; then press ENTER. If you are a first time caller, the BBS asks if your name is spelled correctly. If you answer yes, a questionnaire is displayed. You must complete the questionnaire to use the BBS on your first call. 4.
MT64DSU Owner's Manual 2. Mark each file area you would like to examine by typing its list number and pressing ENTER. 3. Enter L to list all the files in the selected file areas. Enter C to go forward in the file list and P to go back. 4. To mark one or more files for download, type M, press ENTER, type the list numbers of the files, and press ENTER again. 5. Enter D. You will see a list of the files you have marked.
Chapter 4 - Warranty, Services, and Tech Support About the Multi-Tech Fax-Back Service Multi-Tech’s fax-back system provides 24-hour access to sales, marketing, and technical literature. Dial 612-717-5888, follow the voice prompts, and request document number 10 for a catalog of available documents. For convenience, have your fax number ready: ________________. From the catalog of available documents, you can order newsletters, white papers, press releases, etc.
MT64DSU Owner's Manual 38
MultiDSU64K Appendixes
MT64DSU Owner's Manual Appendix A - AT Commands and S-Registers Introduction AT commands are the means by which you, and your datacomm software, are able to communicate with and configure your MultiDSU64K. They enable you to establish, read, and modify parameters in addition to dialing. Certain configuration parameters are stored in S-Registers. These Registers may be read, may be written to directly or may be modified by other AT Commands. V.
Appendixes Action Commands A/ Re-execute previous command (no AT prefix required with this command). DSn Dial a stored number (n = 0 thru 9 memory location). Ten phone numbers can be stored. Dxxx Number of characters allowed in a telephone number string. A telephone number xxx may contain a maximum of 16 characters. Note digital circuits do not provide the option of either pulse or tone dialing. The MultiDSU64K, however, will accept either ATDT or ATDP dialing prefix.
MT64DSU Owner's Manual S-Registers Certain configurations are stored in memory registers called, S-Registers. The S command is used to assign a value to, and to read the current value of an S-Register. To assign a value to an SRegister, enter the letter S, followed by the S-Register number and an equals sign (=). To read an S-Register value, enter the letter S followed by the S-Register number and a question mark (?), then hit RETURN (e.g., ATS8?).
Appendixes S4 DCE Interface Mode S4 = 0 S4 = 1 DCE Interface is Async DCE Interface is Sync S5 (Not Used) S6 (Not Used) S7 Echo Canceler Tone S7 = 0 S7 = 1 Echo Canceler Tone Disabled Echo Canceler Tone Enabled S8 RTS Control S8 = 0 S8 = 1 RTS On CTS follows RTS S9 DSR Control S9 = 0 S9 = 1 DSR On DSR off in Test Mode or when Off-line S10(Not Used) S11(Not Used) S12 Async data bits excluding start/stop/parity bits S12 = 0 S12 = 1 8 bits 7 bits S13 Async Stop bits S13 = 0 S13 = 1 S13 = 2 1 bi
MT64DSU Owner's Manual S15 Async DTE Dialing S15 S15 S15 S15 =0 =1 =2 =3 Disabled DTR low-to-high Transition AT Command DTR or AT Command S16 V.
Appendixes Result Codes When the MultiDSU64K receives an AT command from the terminal or PC, the MultiDSU64K tries to execute the command, then sends a status message to the PC or terminal which reports the "results" of the command (hence the name "result codes"). The MultiDSU64K provides you with several responses, or “Result Codes”, that provide visual responses during Command mode operation. These Result Codes, when activated by an AT command are displayed on your video monitor.
MT64DSU Owner's Manual Configuration Options This section describes the configuration parameters option settings. Corresponding S-Registers and AT commands are listed for each option or function. Synchronous Options If the MultiDSU64K is configured for synchronous operation (*S4=1), the following options apply: DTE Dialing (S2) - Selects the option for dialing synchronously. The options are V.25bis, DTR, V.25bis or DTR and DISABLED. When V.25bis is selected, the unit auto-dials in accordance with V.
Appendixes DTE Dialing (S15) - Selects the type of asynchronous auto-dialing to be used by the DTE port. Options are AT Command, DTR (lowto-high), AT or DTR, and DISABLED. The factory default setting is AT Command--S15 = 2. Parameter Options The following options enable downloading of configurations parameters to a remote unit and the ability to lock a local unit to prevent local or remote changes to the configuration: Param Download (*W) - The AT*W command downloads parameters to the remote unit.
MT64DSU Owner's Manual Synchronous Auto-Dial The beginning of this chapter described the AT command set which enables the MultiDSU64K to dial, hang-up, and be configured for various applications. These commands, however, are only functional when the DCE transmits asynchronous data. That is, the AT command set cannot be used in synchronous environments. CCITT V.25bis commands provide you with an alternate set of commands and responses for synchronous applications. V.
Appendixes Clear Number in Memory (CLA) Command The CLA command clears a specific number in the nn phone number memory location by entering CLAnn. Dial Phone Number Stored in Memory (CRS) Command A telephone number that is stored in the DSU's memory may be automatically dialed. There are ten locations, 0 through 9. For example, a number stored in nn location 8 would be entered by dialing CRS8 and hitting RETURN.
MT64DSU Owner's Manual V.25bis Result Codes V.25bis Responses (Result Codes) When in V.25bis mode, your MultiDSU64K provides you with several responses which can help you follow the progress of V.25bis operations. These are similar to the Result Codes associated with AT Command mode operation. The V.25bis responses are in the form of three-character mnemonics as listed below: INC VAL Incoming Call (same as RING indicator) A valid V.
Appendixes Appendix B - Application Examples INTRODUCTION This section illustrates several types of applications in which the MultiDSU64K is typically used. These types include: • DDS point-to-point application, • DDS multipoint (polled) application, • Local Area Data Set, • External Clocking application, and • Analog Off-Net Extension application DDS POINT-TO-POINT APPLICATION In this application, the MultiDSU64K provides the interface between the DDS line and the DTE at your site.
MT64DSU Owner's Manual Multipoint DDS provides communication between a control station and two or more remote stations. All data transmitted by the control station is sent to each remote station. For data transmitted from the remote stations, the MJUs combine bit streams from the remote stations into a single, serial bit stream sent to the control station. All stations on the same multipoint circuit must run at the same bit rate (any of the DDS customer service rates).
Appendixes LOCAL AREA DATA SET APPLICATION Your MultiDSU64K can be used as a point-to-point LADS (Local Area Data Set) at transmission speeds of 2400, 4800, 9600, 19200, 56000 or 64000 bps over 4-wire, non-loaded metallic wire pairs. The installation of the MultiDSU64K in a LADS application is the same as for DDS applications, except for the timing (Clocking) setting.
MT64DSU Owner's Manual EXTERNAL CLOCKING APPLICATION This application is similar to the Local Area Data Set application except for the timing option setting. In the example below, the DTE connector of the T1 mux is connected to the DTE connector of the MultiDSU64K. Here, the MultiDSU64K must receive timing information from the T1 mux. The MultiDSU64K is set for external timing in this type of application. At the DTE end, DDS timing is selected, providing normal clocking to the DTE.
Appendixes The analog modem at the same end as the MultiDSU64K must have External Timing enabled; the modem at the end of the off-net extension must have DDS Timing enabled. In MultiDSU64K applications that use controlled carrier, the CTS delay for the analog modem at the end of the off-net extension must be longer than the CTS delay of the MultiDSU64K. Figure B-5.
MT64DSU Owner's Manual Appendix C - Interface Signals and Connector Pinouts DDS RJ48S CONNECTOR Pin 1 Pin 8 Key As viewed from the rear Figure C-1. RJ48S Connection DESCRIPTION This connector ties the MultiDSU64K to the DDS Network.
Appendixes RS-232C DB25S CONNECTOR Figure C-2. RS-232 Connection DESCRIPTION This connector ties the MultiDSU64K to the DTE. The DB25S connector has the following pinout configuration.
MT64DSU Owner's Manual V.35 34-PIN CONNECTOR V.
Appendixes LOOPBACK CABLE 1 8 Figure C-4. Loopback Cable DESCRIPTION This cable lets you test the MultiDSU64K when a second DSU is not available. It tests the DSU by having the DSU generate a signal, then the cable “loops” the signal back to the DSU for comparison to the original signal sent. You can order this cable (#45640100) from Multi-Tech, or build one using the instructions below. SCHEMATIC 1 2 3 4 RJ48S 5 6 7 8 TRANSMIT TRANSMIT RECEIVE RECEIVE 6" BUILD INSTRUCTIONS 1.
MT64DSU Owner's Manual BACK-TO-BACK CABLE 1 8 Figure C-5. Back-to-Back Cable DESCRIPTION This cable lets you test a suspect DSU by connecting it to a known good DSU. It tests the suspect DSU by connecting its Transmit signal to the good DSUs Receive circuits. You can order it from Multi-Tech (#45050000), or build one using the instructions below. Refer to Chapter 4 for test procedures. SCHEMATIC 8 7 6 5 4 RJ48S 3 2 1 1 2 3 4 RJ48S 5 6 7 8 7" BUILD INSTRUCTIONS 60 1. Strip cable installation 3/4". 2.
Appendixes CROSSOVER CABLE DSU (DCE) Modem (DCE) TxD 2 2 TxD RxD 3 3 RxD RTS 4 4 RTS CTS 5 5 CTS DSR 6 6 DSR GND 7 7 GND CD 8 8 CD DTR 20 20 DTR 22 22 Male Male RI RI Figure C-6. Crossover Cable In applcations using the MULTIDSU64K for an off-net extension a “cross-over” cable is required to connect the MultiDSU64K DCE connector to the analog modem in this application.
MT64DSU Owner's Manual Appendix D - DIP-Switch Summary Synchronous DIP-Switch Effect #1 #2 Sync Speeds 9.6K 19.2K DN UP DN DN #3 #4 Internal UP UP External DDS UP *DN DN *DN #5 UP *DN Asynchronous Mode On Synchronous Mode On #6 UP *DN RTS Controlled by DTE RTS Forced On #7 UP *DN DSR Controlled by DSU DSR Forced On #8 UP *DN Local Loopback (to DTE) Normal Asynchronous DIP-Switch Effect #1 #2 Sync Speeds 9.6K 19.2K DN UP DN DN 38.4K *DN UP 64K UP UP 57.
Appendixes Appendix E - FCC Regulations for Telephone Line Interconnection 1. This equipment complies with Part 68 of the Federal Communications Commission (FCC) rules. On the outside surface of this equipment is a label that contains, among other information, the FCC registration number and ringer equivalence number (REN). If requested, this information must be provided to the telephone company. 2.
MT64DSU Owner's Manual 6. If trouble is experienced with this equipment (see model indicated below) please contact Multi-Tech Systems, Inc. at the address shown below for details on how to have repairs made. If the trouble is causing harm to the telephone network, the telephone company may request you remove the equipment from the network until the problem is resolved. 7. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees.
Index Index A About This Manual 7 Action Commands 41 ANALOG OFF-NET EXTENSION APPLICATION 54 Analog Off-Net Extension Application 55 Application Examples 51 Async data bits 43 Async DTE Dialing 44 Asynchronous/Synchronous Operation 18 Auto-Answer 42 Auto-Disconnect 42 Dial Phone Number Stored in Memory (CRS) Command 48 Digital Interface 12 Digital Loopback Test 19 Dimensions 12 DIP-Switch Summary 62 Disregard or Connect to Incoming Calls (DIC or CIC 49 DSR Control 43 DSU Loopback Test with Loopback Cable
MT64DSU Owner's Manual L S Limited Warranty On-line Warranty Registration 32 Listing Numbers Stored in Memory (RLN) Command 49 Local Area DataA Set Application 53 Loopback Cable 59 SDLC/BSC Option 19 Speed Switches 17 Stop Bits (S13) 46 Store a Phone Number in Memory (PRN) Command 48 Sync DTE Dialing 42 System Reset (*R) 47 M T Model Number 11 Modulation 12 MultiDSU64K Back Panel 14, 15 MultiDSU64K PC Circuit Board 16 Multipoint (Polled) Application 51, 52 Temperature 12 Terse/Verbose 45 Transmit Le
