Standalone Voice/IP Gateway Models MVP400 and MVP 800 User Guide
User Guide 88310600 Revision A MultiVOIP400 (Model MVP400) and MultiVOIP 800 (Model MVP 800) This publication may not be reproduced, in whole or in part, without prior expressed written permission from MultiTech Systems, Inc. All rights reserved. Copyright © 1999, by Multi-Tech Systems, Inc. Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose.
Contents Chapter 1 - Introduction and Description Introduction ................................................................................................................................................ 6 Preview of this Guide ................................................................................................................................. 6 MultiVOIP Application ..............................................................................................................................
Chapter 5 - Remote Configuration and Management Introduction .............................................................................................................................................. Remote Configuration .............................................................................................................................. Modem-Based ................................................................................................................................... LAN-Based ......
Chapter 1 - Introduction and Description
MultiVOIP User Guide Introduction Welcome to Multi-Tech's new standalone Voice/IP Gateways which allow analog voice and fax communication over an IP network. Multi-Tech’s new voice/fax over IP gateway technology allows voice and fax communication to ride, with no additional expense, over your existing IP network, which has traditionally been data-only.
Chapter 1 - Introduction and Description Chapter 5 - Remote Configuration and Management Chapter 5 provides procedures for changing the configuration of a remote MultiVOIP. Remote configuration allows you to change the configuration of a unit by simply connecting two modems between the two MultiVOIPs and remotely controlling the unit. Chapter 5 also describes typical client applications (i.e., Telnet and Web-based management) used for remote configuration of the MultiVOIP.
MultiVOIP User Guide MultiVOIP Application A typical Voice Over IP (VOIP) network is shown in Figure 1-2 with a headquarters site and three remote sites (Sales office, regional and marketing offices). This typical Voice Over IP network can be set up via the Internet or your Intranet. The headquarters site is set up with a 4-channel MultiVOIP (MVP 400) connected to the headquarters LAN and four voice/fax channels connected to the inhouse telephone switch (PBX).
Chapter 1 - Introduction and Description Phone Directory Data Base Number Description 101 Headquarters Trunk Ext 4 102 Headquarters Trunk Ext 5 103 Headquarters Trunk Ext 6 104 Headquarters Trunk Ext 7 201 Sales KTS 201 202 Sales PSTN 202 301 Regional 301 302 Regional 302 401 Marketing Trunk Ext 9 402 Marketing Trunk Ext 10 Channel 1 IP Address 201.23.122.118 2 201.23.122.118 3 201.23.122.118 4 201.23.122.118 1 205.24.123.119 2 205.24.123.119 1 206.25.124.120 2 206.25.124.120 1 207.26.
MultiVOIP User Guide Using the same example as above, but calling the Regional office. A person at headquarters would pick up a telephone and dial say trunk extension 5. This connects channel 2 of the headquarters MultiVOIP. A second dial tone is heard, then you would dial say 301. The telephone connected to channel 1 of the Regional office MultiVOIP rings and your voice conservation takes place.
Chapter 1 - Introduction and Description Front Panel Description The front panel contains three groups of LEDs that provide the status of the Ethernet connection, Voice/Fax channels, and general status of the MultiVOIP. The front panel is shown in Figure 1-3, and a description of each LED follows. Figure 1-3. Front Panel ETHERNET RCV Receive Data indicator blinks when packets are being received from the local area network.
MultiVOIP User Guide Back Panel Description The cable connections for the MultiVOIP are made at the back panel. Connectors include Power, Command Port (RS232), Ethernet (10BASE-T), Voice/Fax Channels (E&M, FXO and FXS). The cable connectors are shown in Figure 1-4 and defined in the following groups.
Chapter 1 - Introduction and Description Specifications • One 1 Meg by 32 byte at 70 nanosecond SIMM is 4 Mb DRAM Caution: SIMM speed and size cannot be mixed • Two Meg of flash memory Ethernet Port • Single Ethernet Interface - 10Base-T (twisted pair) keyed RJ-45 connector. Command Port • Single 19.
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Chapter 2 - Installation
MultiVOIP User Guide Installing Your MultiVOIP The basic steps of installing your MultiVOIP network involve unpacking the units, connecting the cables, and configuring the units using the included management software (MultiVOIP Configuration). The recommended installation process includes three phases that, when completed, result in a fully functional Voice Over IP network. A general description of each phase is provided below, and detailed instructions follow throughout the rest of this section.
Chapter 2 - Installation Unpacking Your MultiVOIP Remove all items from the box. Figure 2-1. Unpacking Safety Warnings Caution Danger of explosion if battery is incorrectly replaced. A lithium battery on the voice/fax channel board provides backup power for the time keeping capability. The battery has an estimated life expectancy of ten years. When the battery starts to weaken, the date and time may be incorrect.
MultiVOIP User Guide Phase 1: Cabling Procedure Phase 1 cabling involves connecting the master MultiVOIP to your LAN and telephone equipment. 1 If you are connecting any Voice/Fax Channel to an E&M trunk other than type 2, perform the E&M Jumper Block Positioning procedure before connecting power to the unit. 2 Connect one end of the power supply to a live AC outlet and connect the other end to the MultiVOIP as shown in Figure 2-2. The power connector is a 7-pin circular DIN connector.
Chapter 2 - Installation E&M Jumper Block Positioning Procedure A jumper block exists for each voice/fax channel. The jumper block is to the right of each set of channel jacks. The jumper block contains 8-pairs of pins. The jumper plug fits over three pairs of pins on the jumper block. The E&M type number is labeled on the pc board. The jumper plug needs to be centered on the E&M type number. Perform the following procedure to change E&M jumper position.
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Chapter 3 - Software Loading and Configuration
MultiVOIP User Guide Phase 1: Configuring Your Master MultiVOIP The following software loading procedure does not provide every screen or option in the loading process. The assumption is that a technical person is doing the installation and that a thorough knowledge of Windows and the software loading process is understood. Additional information on the MultiVOIP software is provided in the User Guide supplied with your MultiVOIP.
Chapter 3 - Software Loading and Configuration 5 Follow the on-screen instructions to install your MultiVOIP software. You may choose the Destination Location of your MultiVOIP software or you can choose to select the default destination by clicking Next. If you click Browse, you can choose from several folders. It is recommended to choose the default destination. 6 The following dialog box selects the COM port of your PC connected to the Command port of the MultiVOIP.
MultiVOIP User Guide 9 The Default Setup dialog box is displayed. Click YES to continue. 10 The IP Protocol Default Setup dialog box is displayed. The default Frame Type is TYPE_II. If this does not match your IP network, change the Frame Type by clicking on the drop down box. The Frame Type choices are TYPE_II and SNAP. 11 In the Ethernet group, enter the IP Address, Subnet Mask, and Gateway Address, unique to your IP LAN, in the corresponding fields.
Chapter 3 - Software Loading and Configuration If your station device uses ground start, then chose FXS (Ground Start) option. Refer to the device’s user documentation. If you are using an extension from your PBX, then chose FXO option. Check with your inhouse telephone personnel to verify connection type. If you are connecting to a trunk on your PBX, then chose E&M option. If you chose an FXO interface, then the Dialing Options Regeneration group is enabled.
MultiVOIP User Guide 17 If you selected the FXO interface and are using touchtone dialing, you can set up the DTMF gain (or output level in decibels - dB) for the higher and lower frequency groups of the DTMF tone pair. Make your selections in the drop-down lists in the DTMF Gain group. Note: Only change the DTMF gain under the direction of Multi-Tech Technical Support supervision. 18 The Fax group enables you to send and receive faxes on the selected voice/fax channel.
Chapter 3 - Software Loading and Configuration 23 The Phone Directory Database dialog box is displayed. You will build your personalized VOIP Phone Directory Database in the following steps. A MultiVOIP configured as a Master will contain the master data base. The master database ties the VOIP Phone Number to the IP address of the MultiVOIP and to the Voice/Fax Channel on the MultiVOIP. The phone directory data base provides the path to connect all the MultiVOIPs in your Voice Over IP network.
MultiVOIP User Guide want to enter in the Ethernet Node ID field. 28 Click OK and you are returned to the Phone Directory Database dialog box, which now includes phone number 101 with its IP address, channel number and description. 29 Click Add (+) and the Add/Edit Phone Entry dialog box is displayed again. 30 Enter the phone number for the remote MultiVOIP in the Station Information group Phone Number field. For example, 201.
Chapter 3 - Software Loading and Configuration 33 Click OK and you are returned to the Phone Directory Database dialog box, which now includes the second number and related information in the Phone Number list. Note: If only Channel 1 is active, you must enter two phone numbers. The first number will be the local MultiVOIP phone number for Channel 1, and the second number will be the remote MultiVOIP phone number for Channel 1.
MultiVOIP User Guide 38 Check to ensure that the BTG LED on the MultiVOIP is Off after the download is complete. This may take several minutes as the MultiVOIP reboots. 39 Win3.1 users - you are returned to your Program Manager where the MultiVOIP Program Group and Program Item (Windows icons) have been created. Win95/NT users - you are returned to your desktop.
Chapter 3 - Software Loading and Configuration Phase 2: Configure Your Slave MultiVOIPs The slave MultiVOIPs can be another MVP 400 or MVP 800 unit or a MultiVOIP-series. If your slave MultiVOIP is an MVP 400 or MVP 800, perform the following software loading procedure. If your slave is a MultiVOIP-series, connect your command port cable and power up the unit according to the cabling procedure in the MultiVOIP-series Quick Start.
MultiVOIP User Guide 3 The IP Setup dialog box is displayed. The default Frame Type is TYPE_II. If this does not match your IP network, change the Frame Type by clicking on the drop down box. The Frame Type choices are TYPE_II and SNAP. 4 In the Port Address group, enter the IP Address and IP Mask. In the Gateway Address group, enter the gateway IP address for the slave unit.
Chapter 3 - Software Loading and Configuration If you are using an extension from your PBX, then chose FXO option. Check with your inhouse telephone personnel to verify connection type. If you chose an FXO interface, then the Dialing Options Regeneration group is enabled. Check with your local in-house telephone personnel to verify whether your local PBX dial signaling is Pulse or tone (DTMF). Set the Regeneration option accordingly. If you are connecting to a E&M trunk on your PBX, then chose E&M option.
MultiVOIP User Guide 9 To change the voice coder, first select the channel by clicking the Select Channel down arrow and highlighting the channel number, then click the Voice Coder down arrow and highlight your new voice coder entry. If you changed the voice coder, ensure that the same voice coder is used on the voice/fax channel you are calling; otherwise, you will always get a busy signal.
Chapter 3 - Software Loading and Configuration 15 To change the Tone Pairs on the Regional tab, click the Country/Region down arrow and highlight your specific country or region. The Tone Pairs group parameters change per your choice. Click OK and you are returned to the main menu. 16 From the main menu, click Phone Book to display the Phone Directory Database dialog box. In the Database Type group, click the Slave option. The Master IP Address field becomes active.
MultiVOIP User Guide 20 Select (check) Save Current Setup as the User Default Configuration, then click OK. 21 The Writing Setup dialog box is displayed as the setup configuration is written to the MultVOIP. After the setup is written to the MultiVOIP, the unit reboots. 22 Check that the BTG LED on the MultiVOIP is Off after the download is complete. This may take several minutes as the MultiVOIP reboots. 23 You are returned to the main menu. Your MultiVOIP is operational at this time.
Chapter 3 - Software Loading and Configuration Phase 3: Deploy the VOIP Network Phase 3 involves the VOIP Administrator developing the VOIP Dialing Directory and deploying the preconfigured slave MultiVOIPs to their remote sites. The remote site administrators need only connect power to the preconfigured MultiVOIP, connect it to their Ethernet LAN and predefined telephone equipment, and then wait for the phone directory database to be down loaded.
MultiVOIP User Guide If you are connecting the station side of a telephone switch (PBX) to your MultiVOIP, connect one end of an RJ11 phone cord to the Voice/Fax Channel 1 FXO connector on the back of the MultiVOIP and the other end to the phone jack. If you are connecting an E&M trunk from a telephone switch to your MultiVOIP, connect one end of an RJ45 phone cord to the Voice/Fax Channel 1 E&M connector on the back of the MultiVOIP and the other end to the trunk.
Chapter 4 - MultiVOIP Software
MultiVOIP User Guide Introduction This chapter describes the MultiVOIP software with the intent to show you how to make changes to the configuration of your MultiVOIP. The major configuration parameters were established during the loading of the software (Chapter 3), and the MultiVOIP software and configuration utilities allow you to make changes to that initial configuration. The MultiVOIP software allows you to refine your configuration based on your network connections.
Chapter 4 - MultiVOIP Software MultiVOIP Configuration The MultiVOIP Setup menu consists of 10 buttons in which you can point and click, an Events window in the middle of the menu, and a status bar at the bottom of the menu.
MultiVOIP User Guide Changing Channel Parameters The channel parameters include the interface type and its options, voice and fax settings, and voice communications for the region of the world that the MultiVOIP resides in. The Channel Setup dialog box is accessed from the Main MultiVOIP menu. The Channel Setup dialog boxes contain three tabs that partition the channels into three categories, i.e., interface, voice/fax, and regional.
Chapter 4 - MultiVOIP Software are unsure of the correct selection, contact the personnel in charge of your PBX or your local telephone company to determine whether pulse or DTMF should be used. E&M Interface The E&M Interface is used to connect PBX E&M trunks. You will need to select between Dial Tone or Wink signaling and also between 2-wire and 4-wire mode. If wink signaling is selected, the wink timer field becomes active with a range from 100 to 350 milliseconds.
MultiVOIP User Guide has to have the same voice coder selected; otherwise, you will always get a Busy signal. The Fax group enables a fax machine to transmit and receive faxes through the MultiVOIP. If a fax machine is connected to one of the voice/fax channels, the Max Baud Rate should be set to match the baud rate of the fax machine (refer to user documentation).
Chapter 4 - MultiVOIP Software Changing the Phone Directory Database The Phone Directory Database dialog box displays all the phone numbers in your MultiVOIP network. The database displays the phone numbers in numerical order with the IP Address, Channel assignment, and Description. Access this database by clicking the Phone Book button on the Main MultiVOIP menu. You can add, delete, or edit any entry in the database and you can change the master - slave relationship of the database.
MultiVOIP User Guide connection and the Proxy Server is using dynamic addressing (i.e., the ISP is assigning the Proxy Server IP address), then this slave MultiVOIP will be defined as using Dynamic addressing and the IP Address field in the Identified By group will grey out (be inactive). If a Proxy Server with a static IP address is in front of the slave MultiVOIP, then the Identified By IP Address field must contain the address of the Proxy Server.
Chapter 4 - MultiVOIP Software Changing IP Parameters The IP Setup dialog box establishes the IP addressing for the local Ethernet LAN, defines the Internet gateway address, and if a proxy server is used to connect a LAN to the Internet, global-to-local IP address translation is required. The IP Setup dialog box is accessed from the Main MultiVOIP menu by clicking on the IP button. When the IP Setup dialog box is displayed, the IP address of your LAN is displayed with its IP Mask.
MultiVOIP User Guide MultiVOIP located behind a Proxy Server at the static IP address. This static IP address will be used in the Phone Directory Database when assigning directory numbers to this MultiVOIP. The Global IP Address field must contain the static IP address of the WAN port of the Proxy Server. The Local IP Address field must contain the local IP address of the MultiVOIP. In this case the local IP address is not used in the Phone Directory Database.
Chapter 4 - MultiVOIP Software Viewing Statistics The Statistics dialog box enables you to view statistics for major events of the MultiVOIP operation. This dialog box is accessed by clicking on the Statistics button on the Main MultiVOIP menu. Statistics can be a helpful troubleshooting tool. For example, viewing the Voice Channel statistics you can see the attempted and completed calls, call duration, average call length, bytes/packets send and received, etc.
MultiVOIP User Guide For the most part these statistics are informational, and their use as a troubleshooting tool will be contingent on the applications running in the upper layers. For example, if you were having problems connecting to the MultiVOIP’s web server, you would look under the TCP section to see if any connections are being established. If not, that may indicate the web server is not enabled.
Chapter 4 - MultiVOIP Software Others Setup Clicking the Others button on the main menu displays the Others Setup dialog box. This dialog box lets you to enable SNMP Agent (the default is disabled) and set up all the necessary parameters; enable or disable various remote configuration methods such as TFTP (Trivial File Transfer Protocol) Server, Web Server, Dumb Terminal, and Telnet Server; and assign a Password to the MultiVOIP for Internet security.
MultiVOIP User Guide Viewing Call Progress The Call Progress dialog box displays the status of a call in progress. This dialog box is accessed from the MultiVOIP Setup menu by clicking on the Call Progress button. The ratio of Packets Lost versus Packets Received provides a general indication of the integrity of the Internet connection. To reduce the frequency of lost packets, select a low-bit-rate coder, such as, G.723 or Netcoder.
Chapter 5 - Remote Configuration and Management
MultiVOIP User Guide Introduction This chapter provides procedures for viewing or changing the configuration of a remote unit. Two methods are provided to access a remote unit; the first method is modem based and the second method is using IP. Within the IP method, three applications can be used: 1) LAN-Based using TFTP (Trivial lFile Transfer Protocol), 2)Telnet as a client application, or 3) a standard web browser on the Internet.
Chapter 5 - Remote Configuration and Management Verify that the Communication Type is set for COM Port and the Select Port field is set for the COM port of your local PC. In the Dial String field, enter the AT command for dialing (ATDT) plus the phone number of the remote MultiVOIP.
MultiVOIP User Guide LAN-Based The LAN-based remote configuration requires a Windows Sockets compliant TCP/IP stack. TCP/IP protocol software must be installed and functional before the configuration program can be used. 1 You must assign an Internet (IP) address for the PC and for each node that will be managed by the configuration program. Refer to the protocol software documentation for instructions on how to set the IP addresses.
Chapter 5 - Remote Configuration and Management and field within a dialog box. 7 After you have changed the configuration of the remote MultiVOIP, click Download Setup to update the configuration. The remote MultiVOIP will be brought down, the new configuration written to the unit, and the unit will reboot. 8 Click Exit when the downloading is complete. 9 Double click on the MultiVOIP Configuration icon in the MultiVOIP program group to verify that the MultiVOIP is running.
MultiVOIP User Guide Remote Management This section describes typical client applications that can be used to configure the MultiVOIP remotely. It is important to note that although any subsequent changes to configuration can be made using these applications, the initial setup and configuration of the MultiVOIP must be done on the local PC, using the MultiVOIP software provided with your unit.
Chapter 5 - Remote Configuration and Management MultiVOIP Telnet Server Menu The MultiVOIP Telnet Server menu provides three basic options: Voice over IP Configuration, Phone Directory Database, and Phone Directory Configuration. A further option enables you to close the Telnet session. Voice over IP Configuration Selecting Option 1 displays the main menu, which allows further configuration options.
MultiVOIP User Guide WEB Management The MultiVOIP can be accessed, via a standard Web browser, from anywhere on the connected Internet. In order to provide this support, the WEB Server option has to be enabled from the Others button in the main menu which displays the Applications Setup dialog box (see Chapter 4 - MultiVOIP Software). Once enabled, users can access the MultiVOIP by entering its IP address in the destination field of their web browser. The following screen appears.
Chapter 6 - Warranty, Service and Tech Support
MultiVOIP User Guide Introduction This chapter starts out with statements about your MultiVOIP 2-year warranty. The next section, Tech Support, should be read carefully if you have questions or problems with your MultiVOIP. It includes the technical support telephone numbers, space for recording your product information, and an explanation of how to send in your MultiVOIP should you require service.
Chapter 6 - Warranty, Service 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 1-800-9722439. Please fill out the MultiVOIP information (below), and have it available when you call. If your MultiVOIP requires service, the tech support specialist will guide you on how to send in your MultiVOIP (refer to the next section).
MultiVOIP User Guide Service If your tech support specialist decides that service is required, your MultiVOIP may be sent (freight prepaid) to our factory. Return shipping charges will be paid by Multi-Tech Systems. Include the following with your MultiVOIP: • 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 MultiVOIP is out of warranty.
Appendix A - TCP/IP Description 2. Enter the name of the file you wish to download from the BBS. 3. If a password is required, enter the password. 4. Answer Y or N to the automatic logoff question. 5. Select a file transfer protocol by typing the indicated letter, such as Z for Zmodem (the recommended protocol). 6. If you select Zmodem, the transfer will begin automatically. If you select another protocol, you may have to initiate the transfer yourself.
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Appendixes
MultiVOIP User Guide Appendix A - TCP/IP (Transmission Control Protocol/Internet Protocol) Description TCP/IP is a protocol suite and related applications developed for the U.S. Department of Defense in the 1970s and 1980s specifically to permit different types of computers to communicate and exchange information with one another. TCP/IP is currently mandated as an official U.S. Department of Defense protocol and is also widely used in the UNIX community.
Appendix A - TCP/IP Description response, are better suited to the datagram service of UDP because there is no time lost to virtual circuit establishment and termination. UDP’s primary function is to add a port number to the IP address to provide a socket for the application.
MultiVOIP 200 User Guide Internet Protocol (IP) IP is the Internet standard protocol that tracks Internetwork node addresses, routes outgoing messages and recognizes incoming messages, allowing a message to cross multiple networks on the way to its final destination. The IPv6 Control Protocol (IPV6CP) is responsible for configuring, enabling, and disabling the IPv6 protocol modules on both ends of the point-to-point link. IPV6CP uses the same packet exchange mechanism as the Link Control Protocol (LCP).
Appendix B - Cabling Diagrams Appendix B - Cabling Diagrams Command Port Cable 13 12 25 24 11 10 23 22 9 8 7 21 20 6 19 5 18 4 17 3 16 2 15 1 14 DB-9 DB-25 1 8 2 3 3 2 4 20 5 7 6 6 7 4 8 5 9 22 LAN Cable 1 2 3 4 5 6 7 8 Pin Circuit Signal Name 1 2 3 6 TD+ Data Transmit Positive TD- Data Transmit Negative RD+ Data Receive Positive RD- Data Receive Negative Voice/Fax Channel Connectors 1 2 3 4 5 6 7 8 2 3 4 5 2 3 4 5 Pin Connections E&M 1 2 3 4 5 6 7 8 De
MultiVOIP 200 User Guide Appendix C - Regulatory Information Class A Statement FCC Part 15 NOTE: 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.
Appendix C - Regulatory Information 3. An FCC-compliant telephone cord with modular plug is provided with this equipment. This equipment is designed to be connected to the phone network or premises wiring using a compatible modular jack which is Part 68 compliant. See installation instructions for details. 4. If this equipment causes harm to the phone network, the phone company will notify you in advance that temporary discontinuance of service may be required.
MultiVOIP 200 User Guide appropriate electric inspection authority, or electrician, as appropriate. EMC, Safety and Terminal Directive Compliance The CE mark is affixed to this product to confirm compliance with the following European Community Directives: Council Directive 89/336/EEC of 3 May 1989 on the approximation of the laws of Member States relating to electromagnetic compatibility.
Glossary
MultiVOIP User Guide A Access: The T1 line element made up of two pairs of wire that the telephone company brings to the customer premises. The Access portion ends with a connection at the local telco (LEC or RBOC). Accunet Spectrum of Digital Services (ASDS): The AT&T 56K bps leased (private) line service. Similar to services of MCI and Sprint. ASDS is available in nx56/64K bps, where n=1, 2, 4, 6, 8, 12.
Glossary Bell Operating Companies (BOC): The family of corporations created during the divestiture of AT&T. BOCs are independent companies which service a specific region of the US. Also called Regional Bell Operating Companies (RBOCs). Bell Pub 41450: The Bell publication defining requirements for data format conversion, line conditioning, and termination for direct DDS connection.
MultiVOIP User Guide Circuit switching: The temporary connection of two or more communications channels using a fixed, non-shareable path through the network. Users have full use of the circuit until the connection is terminated. Clear Channel: A transmission path where the full bandwidth is used (i.e., no bandwidth needed for signaling, carrier framing or control bits). A 64K bps digital circuit usually has 8K bps used for signaling.
Glossary Digital Loopback: A technique used for testing the circuitry of a communications device. Can be initiated locally, or remotely (via a telecommunications device). The tested device decodes and encodes a received test message, then echoes the message back. The results are compared with the original message to determine if corruption occurred en route. Digital PBX: A Private Branch Exchange that operates internally on digital signals. See also "Exchange".
MultiVOIP User Guide Extended Super Frame (ESF): One of two popular formats for framing bits on a T1 line. ESF framing has a 24-frame super-frame, where robbed bit signaling is inserted in the LSB (bit 8 of the DS-0 byte) of frames 6, 12, 18 and 24. ESF has more T1 error measurement capabilities than D4 framing. ESF and B8ZS are typically both offered to provide clear channel service. F Failed Seconds: A test parameter where the circuit is unavailable for one full second.
Glossary Handshaking: A process that two modems go through at the time of call setup to establish synchronization over the data communications link. It is a synchronization and negotiation process accomplished by the exchange of predefined, mutually recognized control codes. High-level Data Link Control (HDLC): An ISO standard, bit-oriented data communications protocol that provides nearly error-free data transfers. I Hexadecimal: A base 16 numbering system used to represent binary values.
MultiVOIP User Guide Line Coding: The representation of 1s and 0s on a T1 line. The two methods of line coding commonly used, B8ZS and AMI, differ in the restrictions placed on user data. T1 line coding ensures that sufficient timing information is sent with the digital signal to ensure recovery of all the bits at the far end. Timing information on the T1 line is included in the form of 1s in the data stream; a long string of 0s in the data stream could cause problems recovering the data.
Glossary NAK (Negative Acknowledgment): Communications code used to indicate that a message was not properly received, or that a terminal does not wish to transmit. Contrast with ACK. Network: A group of computers connected by cables or other means and using software that enables them to share equipment, such as printers and disk drives to exchange information. Node: Any point within a network which has been assigned an address.
MultiVOIP User Guide Primitive: An abstract representation of interaction across the access points indicating that information is being passed between the service user and the service provider. The OSI Reference Model defines four types of primitives: Request, Indication, Response and Confirm. Private Branch Exchange (PBX): A telephone exchange located on the customer's premises.
Glossary RS232-C: An EIA standard for a serial interface between computers and peripheral devices (modem, mouse, etc.). It uses a 25-pin DB-25, or a 9-pin DB-9 connector. The RS-232 standard defines the purposes, electrical characteristics and timing of the signals for each of the 25 lines. RS-422: The EIA standard for a balanced interface with no accompanying physical connector. RS-422 products can use screw terminals, DB-9, various DB-25, and DB-37 connectors.
MultiVOIP User Guide T1: A digital transmission link capable of 1.544M bps. T1 uses two pairs of normal UTP, and can handle 24 voice conversations, each digitized at 64K bps. T1 is a standard for digital transmission in the U.S., Canada, Japan and Hong Kong. T1 is the access method for highspeed services such as ATM, frame relay, and SMDS. See also T Carrier, T1 line and FT1. T1 Channel Tests: A set of diagnostics that vary by carrier, used to verify a T1 channel operation.
Glossary V V.25bis: An ITU-T standard for synchronous communications between a mainframe or host and a modem using HDLC or other characteroriented protocol. V.54: The ITU-T standard for local and remote loopback tests in modems, DCEs and DTEs.
MultiVOIP User Guide Index Limited Warranty ................................................... 64 O A On-line Warranty Registration ............................... 64 Archie .................................................................... 71 P B Ping ....................................................................... 71 POP ....................................................................... 71 Power Connector ..........................................................
