Voice / Fax over IP Networks Voice/Fax Over IP Networks Model MVP200 Proprietary Mode User Guide
User Guide S000208B Revision B MultiVOIP 200 (Model MVP200) This publication may not be reproduced, in whole or in part, without prior expressed written permission from MultiTech Systems, Inc. All rights reserved. Copyright © 2004, 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. Furthermore, Multi-Tech Systems, Inc.
Contents Chapter 1 - Introduction and Description ..................................................... 5 Introduction ................................................................................................................................................ 6 Preview of this Guide ................................................................................................................................. 7 Typical Application ........................................................................
Viewing Logs ............................................................................................................................................ Viewing Log Entry Details .................................................................................................................. Viewing Channel Totals ...................................................................................................................... Reports ...................................................................
Voice / Fax over IP Networks Chapter 1 - Introduction and Description
Chapter 1 - Introduction and Description Introduction Welcome to Multi-Tech's new voice/fax gateway, the MultiVOIP, model MVP200. The MultiVOIP allows analog voice and fax communication over a traditional data communications/data networking digital Internet. Multi-Tech’s new voice/fax gateway technology allows voice and fax communication to ride, with no additional expense, over your existing communications Internet, which has traditionally been data-only.
Chapter 1 - Introduction and Description Preview of this Guide This guide describes the MultiVOIP and tells you how to install and configure the unit. The information contained in each chapter is as follows: Chapter 1 - Introduction and Description Chapter 1 describes the MultiVOIP. Front panel indicators, and back panel connector descriptions are provided. In addition, a list of relevant specifications is provided at the end of the chapter.
Chapter 1 - Introduction and Description Typical Application Before Voice Over IP (VOIP), voice over the Internet, a corporate office had a data connection to the Internet and a voice connection to the public telephone network. With VOIP, the two networks can be tied together. To accomplish this, a MultiVOIP is connected between the public telephone network and the data network. A typical application for a MultiVOIP is shown in Figure 1-2.
Chapter 1 - Introduction and Description connected directly to your fax machine. In this situation, you would use the FXS interface which has two options: loop start and ground start. Loop start is generally the correct interface to use. If you want a user to be able to call into a facility and then use the local phone capability to dial out to the public phone network, you can choose either the FXO or E&M interface.
Chapter 1 - Introduction and Description database you can construct a VOIP phone book and a VOIP dialing directory. One phone directory database is all that is needed for a VOIP network. This database can be built at one site and then distributed to other sites. The database ties the voice/fax channels to phone equipment and the Ethernet port to your local area network.
Chapter 1 - Introduction and Description Front Panel Description The front panel has three groups of LEDs that provide the status of the Ethernet connection (Ethernet), Voice/Fax channels (Voice/Fax 1 and 2), and general status of the MultiVOIP (Boot and Power). The front panel is shown in Figure 1-4, and a description of each LED follows. Figure 1-4. Front Panel Ethernet RCV Receive Data indicator blinks when packets are being received from the local area network.
Chapter 1 - Introduction and Description 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 1 and 2 (E&M, FXO and FXS). The cable connectors are shown in Figure 1-5 and defined in the following groups. Voice/Fax Channel 1 E&M FXS Voice/Fax Channel 2 FXO FXO FXS E&M Ethernet RS232 10Base-T Command 1 Power 0 Figure 1-5.
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 Megabytes of flash memory Ethernet Port • Single Ethernet Interface - 10BASE-T (twisted pair) keyed RJ-45 connector. Command Port • Single 19.
Voice / Fax over IP Networks Chapter 2 - Installation
Chapter 2 - Installation 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.
Chapter 2 - Installation Unpacking Your MultiVOIP www.multitech.com Remove all items from the box. (See Figure 2-1.) 200 Voice/Fax over IP Networks MADE IN U. S.A MADE IN U.S.A Figure 2-1. Unpacking Safety Warnings Caution: Danger of explosion if battery is incorrectly replaced. A lithium battery on the circuit board provides backup power for the time keeping capability. The battery has an estimated life expectancy of ten years.
Chapter 2 - Installation Cabling Your MultiVOIP Cabling your MultiVOIP involves making the proper Power, Command Port, and Internet connections. Figure 2-2 shows the back panel connectors and the associated cable connections. The Cabling Procedure has step-by-step instructions for cabling your MultiVOIP.
Chapter 2 - Installation 4. If you are connecting a station device such as an analog telephone, a fax machine, or a Key Telephone System (KTS) to your MultiVOIP, connect the smaller end of a special adapter cable (supplied) to the Voice/Fax Channel 1 FXS connector on the back of the MultiVOIP and the other end to the station device.
Chapter 2 - Installation E&M Jumper Block Positioning Procedure Each voice/fax channel on the MultiVOIP has a separate E&M jumper block, located near the jacks on the back panel of the MultiVOIP. Each jumper block has 8 pairs of pins with a jumper plug on three adjacent pairs of pins. The jumper plug must be centered on the E&M type number (see Figure 2-3) that matches the E&M connection for that channel.
Voice / Fax over IP Networks Chapter 3 - Software Loading and Configuration
Chapter 3 - Software Loading and Configuration Installing Your MultiVOIP Software The following installation procedures do not provide every screen or option in the process of installing the MultiVOIP software. It is assumed that a technical person with a thorough knowledge of Windows and the software loading process is doing the installation. Additional information on the MultiVOIP software is provided in Chapter 4, MultiVOIP Software, and in the online Help.
Chapter 3 - Software Loading and Configuration 4. The MultiVOIP Setup welcome window displays. Press Enter or click Next to continue. 5. Follow the on-screen instructions to install your MultiVOIP software. 6. The following dialog box selects the COM port of your PC connected to the Command port of the MultiVOIP. From the Select Port list, select the COM port of your PC. Click OK to continue.
Chapter 3 - Software Loading and Configuration 7. The Setup Complete dialog displays. Click Finish to continue. 8. The following message displays: Click No to continue. 9. The following dialog box displays. Click No to continue. 9. In the v. 201E program group, double-click Upgrade Software. 10. The following window displays. Click Yes to continue.
Chapter 3 - Software Loading and Configuration 11. The IP Protocol Default Setup dialog box displays. The default Frame Type is TYPE_II. If this does not match your IP network, change the Frame Type by selecting SNAP from the Frame Type list. The available Frame Type choices are TYPE_II and SNAP. 12. In the Ethernet group, enter your unique LAN IP address in the IP Address box, then enter the Subnet Mask and Gateway Address for your LAN in the corresponding boxes.
Chapter 3 - Software Loading and Configuration If the E&M interface is selected, the E&M Options group is enabled. Check with your in-house phone personnel to determine if the signaling is Dial Tone or Wink and if the connection is 2wire or 4-wire. If Wink signaling is used, then the Wink Timer is enabled with a default of 250 milliseconds. The range of the Wink Timer is from 100 to 350 milliseconds. Consult with your local in-house phone personnel for this timer setting.
Chapter 3 - Software Loading and Configuration 16. To change the voice coder, select the channel from the Select Channel list, then select the new voice coder entry from the Voice Coder list. 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. 17.
Chapter 3 - Software Loading and Configuration 20. The Billing/Security tab displays the parameters for automatic disconnection, billing options, and dialing options. 21. You can set up billing options for inbound and outbound calls by selecting them in the Billing Options group and then entering the charge in cents per number of seconds. 22. The Call Authentication option enables password protection for outbound and inbound calls on the selected voice/fax channel.
Chapter 3 - Software Loading and Configuration 26. From the Program Group, double-click MultiVOIP Configuration. Click Phone Book. The Phone Directory Database dialog box displays. You will build your personalized MultiVOIP Phone Directory in the following steps. The MultiVOIP configured as a “Host” will contain the host database. The host database has the phone numbers of all the MultiVOIP’s available for communication on an IP network.
Chapter 3 - Software Loading and Configuration 30. In the MultiVOIP Identification group, enter the IP address of the Host MultiVOIP in the IP Address box. For example, 204.22.122.118. Then obtain the 12-digit Node ID# (0008005xxxxx) from the ID plate on the back panel of the MultiVOIP and enter this number in the Ethernet Node ID box.
Chapter 3 - Software Loading and Configuration 35. Enter the IP address of the client MultiVOIP in the IP Address box in the MultiVOIP Identification group. For example, 202.56.39.100. 36. 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.
Chapter 3 - Software Loading and Configuration Configuring Your Client MultiVOIPs If you are installing a MultiVOIP behind a firewall, you need to add the following UDP ports to your firewall. Q.931 Signaling, Ch1 [900] Q.931 Signaling, Ch2 [902] Ch1 RTP [5004] Ch1 RTCP [5005] Status [5000] Ch2 RTP [5006] Ch2 RTCP [5007] Refer to your firewall user documentation to enter and open these ports. 1.
Chapter 3 - Software Loading and Configuration Configure each channel for the type of interface you are connecting to. To change the channel number, select the channel you want to configure from the Select Channel list. 6. The Interface group defaults to FXS (Loop Start). Select the interface option to correspond to the interface type being connected to the Voice/Fax connector on the back panel of the MultiVOIP.
Chapter 3 - Software Loading and Configuration Note: After configuring a given channel, you can copy that channel’s configuration to any other channel by clicking Copy. Everything on the Interface tab will be copied to the other channel. 7. Repeat the above steps to configure the interface type for each voice/fax channel. The Voice/Fax tab displays the parameters for the voice coder, faxing, and DTMF gain. 8.
Chapter 3 - Software Loading and Configuration 12. The Billing/Security tab displays the parameters for automatic disconnection, billing options, and dialing options. 13. You can set up billing options for inbound and outbound calls by selecting them in the Billing Options group and then entering the charge in cents per number of seconds. 14. The Call Authentication option enables password protection for outbound and inbound calls on the selected voice/fax channel.
Chapter 3 - Software Loading and Configuration 17. Click OK. After the upgrade is complete, click Start | Programs| MultiVOIP | MultiVOIP Configuration. On the main menu, click Phone Book to display the Phone Directory Database dialog box. In the Database Type group, click the Client option. The Update Database From group becomes active. 18. Enter the IP address of the host MultiVOIP in the Host IP Address box. 19. Click OK and you are returned to the main menu. 20.
Chapter 3 - Software Loading and Configuration Deploy the VOIP Network Deploying the VOIP network involves the VOIP Administrator developing the VOIP Dialing Directory and deploying the pre-configured client MultiVOIPs to their remote sites. The remote site administrators need only connect power to the pre-configured MultiVOIP, connect it to their Ethernet LAN and predefined telephone equipment, and then wait for the phone directory database to be downloaded.
Chapter 3 - Software Loading and Configuration Remote Site Administrator 3. Unpack your MultiVOIP. 4. Connect one end of the power supply to a live AC outlet and connect the other end to the Power connection on your MultiVOIP. Voice/Fax Channel Connections 10BASET E&M FXO FXS E&M ETHERNET POWER FXS FXO Power Connection PSTN Ethernet Connection Figure 5. Remote Site Cable Connection 5. Connect a network cable to the ETHERNET 10BASE-T (RJ-45) connector on the back of your MultiVOIP. 6.
Voice / Fax over IP Networks Chapter 4 - MultiVOIP Software
Chapter 4 - MultiVOIP Software Introduction This chapter describes various features of the MultiVOIP software that enable you to change (update) the configuration of your MultiVOIP. The basic configuration parameters were established during the loading of the software (Chapter 3). The MultiVOIP software and configuration utilities described in this chapter enable you to change that initial configuration as necessary.
Chapter 4 - MultiVOIP Software MultiVOIP Configuration The MultiVOIP Setup menu enables you to display and change the voice channels and IP protocol parameters, display and manage the Phone Book listing, view statistics and call progress, and change features such as SNMP Agent, Telnet Server, WEB Server, and assign a MultiVOIP password. The Events window in the lower third of the Setup menu provides information about the boot process.
Chapter 4 - MultiVOIP Software Changing Channel Parameters The channel parameters include the interface type and its options, voice and fax settings, and voice communications for the country and region in which the MultiVOIP is operating. The Channel Setup dialog box is accessed by clicking Voice Channels on the Setup menu. Interface The Interface tab defines the parameters related to the physical interface of the voice/fax channel.
Chapter 4 - MultiVOIP Software FXS Interface The FXS Interface is used to connect telephones, fax machines, key telephone systems, and so on, to the MultiVOIP. In addition, you need to select either Loop Start or Ground Start. Most of the equipment mentioned will use Loop Start which is the default. The FXS Options group controls how the selected channel interacts with answering machines. If the Current Loss check box is selected, the local MultiVOIP hangs up when the electrical current is lost.
Chapter 4 - MultiVOIP Software The MultiVOIP supports many state-of-the art ITU (International Telecommunications Union) voice coders. The Voice Coder list enables you to select from a range of coders with specific bandwidths. The higher the bps rate, the more bandwidth is used. The channel that you are calling 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.
Chapter 4 - MultiVOIP Software The Authentication Option enables you to provide Password Protection on Inbound and/or Outbound calls on any of the three interfaces (FXO, FXS, and E&M). A password of up to 14 numeric characters can be assigned to either or both voice/fax channels. The required password must then be entered from the device initiating a call over the protected voice/fax channel.
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 Phone Book on the MultiVOIP Main menu. You can add, delete, or edit any entry in the database and you can change the host-client relationship of the database.
Chapter 4 - MultiVOIP Software client MultiVOIP will be defined as using Dynamic addressing and the IP Address box in the Identified By group will be unavailable. If a Proxy Server with a static IP address is in front of the client MultiVOIP, then the Identified By IP Address box must contain the address of the Proxy Server. If the client MultiVOIP is connected directly to the Internet, then its addressing mode must be Static.
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 for a remote MultiVOIP the global-to-local IP address translation is defined on the Proxy Setup tab. The IP Setup dialog box is accessed by clicking IP on the MultiVOIP 200 Setup menu. When the IP Setup dialog box displays, the IP address of your MultiVOIP displays with its IP Mask.
Chapter 4 - MultiVOIP Software Viewing Call Progress The Call Progress dialog box displays the status of a call in progress. This dialog box is accessed from the MultiVOIP 200 Setup menu by clicking Call Progress. 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 4 - MultiVOIP Software The Password group enables you to enter a password, up to 13 alphanumeric characters, to be used for Internet Security. Once the password is entered (in the MultiVOIP Password box) and confirmed (in the Confirm Password box), remote users will be queried to enter the password before gaining access to the MultiVOIP. For more information on using these applications, refer to Chapter 5, Remote Configuration and Management.
Chapter 4 - MultiVOIP Software Control Protocol (TCP) is a connection-oriented transport layer protocol used with FTP, Telnet, and SNMP. UDP makes use of the port concept and has no measures for flow control, reliability, or error recovery. It is used when the full services of TCP are not required, and the reliability measures must be assumed by another layer. TCP works well in environments where the reliability measures are not assumed by other layers.
Chapter 4 - MultiVOIP Software SNMP Statistics The SNMP Statistics dialog box provides statistical information on Simple Network Management Protocol (SNMP). SNMP is an application layer protocol that facilitates the exchange of management information between network devices. There are three key components in SNMP: the devices that are to be managed, agents, and the network management systems. The managed device is the network device, like a router.
Chapter 4 - MultiVOIP Software Viewing Log Entry Details The Log Entry Details dialog box displays the status of a completed call. This dialog box displays the same details as the Call Progress dialog box after a call is completed. Viewing Channel Totals The Channel Totals dialog box displays Outgoing and Incoming calls with their Attempted and Completed numbers for each channel on this MultiVOIP. The Total Connected Time for the channel is also displayed.
Chapter 4 - MultiVOIP Software Reports A report of the contents of the Log Entries dialog box can be generated using the Windows Notepad accessory and then printed from your local PC. The report is generated by entering the To and From dates in the Report Generation dialog box and then clicking Generate. This function provides a hard copy of the Log Entries dialog box.
Chapter 4 - MultiVOIP Software Upgrade Procedures Whenever you upgrade your version of the MultiVOIP software, you must first install the new software on your PC. Then, download the Firmware, the Factory Defaults, and the Voice Coders to upgrade the MultiVOIP. Before starting the upgrade process, view the current configuration and write down important data such as your IP address, phone book contents, and voice channel configurations.
Chapter 4 - MultiVOIP Software Enter your current configuration in the Channel Setup dialog box. Click OK when finished. Click OK. The MultiVOIP firmware and coders download, then the MultiVOIP reboots.
Chapter 4 - MultiVOIP Software Manual Upgrade Procedure Use this procedure only if you want to manually upgrade your MultiVOIP. Note: Steps 4-8 can be performed via the command port or over IP. 1. Run MultiVOIP Configuration from your old version of the MultiVOIP software. Note the current settings. Your MultiVOIP will be reset to factory defaults during this upgrade. 2. Unistall your old version of MultiVOIP software by selecting the Uninstall MultiVOIP Configuration option from the program group. 3.
Voice / Fax over IP Networks Chapter 5 - Remote Configuration and Management
Chapter 5 - Remote Configuration and Management 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 box is set for the COM port of your local PC. In the Dial String box, enter the AT command for dialing (ATDT) plus the phone number of the remote MultiVOIP. If your Modem Initialization String, Initialization Response, or Connect Response values are different than the defaults in the dialog box, refer to your modem user documentation and change the default values to match your modem.
Chapter 5 - Remote Configuration and Management 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 6. The MultiVOIP 200 Setup dialog box displays. This is the dialog box of the remote MultiVOIP. Refer to the online Help provided with your MultiVOIP for the definition of each 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.
Chapter 5 - Remote Configuration and Management 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 Voice over IP Configuration Selecting Option 1 displays the main menu, which allows further configuration options. These options include Protocol Stacks (option 1), Applications (option 2), System Information (option 3), and Voice Channels (option 4). For further descriptions of these options, refer to Chapter 4 - MultiVOIP Software. Phone Directory Database Selecting Option 2 enables you to add entries to the Phone Directory Database.
Chapter 5 - Remote Configuration and Management Web Management The MultiVOIP can be accessed, using a standard Web browser, from anywhere on the connected Internet. In order to provide this support, select the WEB Server check box in the Applications Setup dialog box (see Chapter 4, MultiVOIP Software). Once enabled, users can access the MultiVOIP by entering its IP address in the Address box of their Web browser. The following Web page appears.
Voice / Fax over IP Networks Chapter 6 - Warranty, Service and Tech Support
Chapter 6 - Warranty, Service and Tech Support 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 phone numbers, space for recording your product information, and an explanation of how to send in your MultiVOIP should you require service. The final section explains how to get support through the Internet.
Chapter 6 - Warranty, Service and Tech Support Service U.S. and Canadian Customers In the event that service is required, products may be shipped, freight prepaid, to our Mounds View, Minnesota, factory: Multi-Tech Systems, Inc. 2205 Woodale Drive Mounds View, MN 55112 Attn: Repairs, Serial #______ A Returned Materials Authorization (RMA) is not required. Return shipping charges (surface) will be paid by MTS.
Chapter 6 - Warranty, Service and Tech Support Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical abuse, or user-caused damages are billed on a time-plus-materials basis. International Distributors Procedures for international distributors of Multi-Tech products are on the Distributor Web site at http:/ /www.multitech.com/PARTNERS/login/. Replacement Parts SupplyNet, Inc.
Voice / Fax over IP Networks Appendixes
Appendix A - TCP/IP Description 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.
Appendix A - TCP/IP Description 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.
Appendix B - Cabling Diagrams Appendix B - Cabling Diagrams Command Port Cable 1 2 3 4 5 6 7 8 RJ-45 DB9F 1 4 2 7 3 8 CLEAR TO SEND 4 3 TRANSMIT DATA 5 2 RECEIVE DATA 6 6 7 1 8 5 PIN NO. To Command Port Connector PIN NO.
Appendix B - Cabling Diagrams Remote Configuration Cable 9-Pin Male To Command port adapter cable 25-Pin Male To DCE Device (e.g.
Appendix C - Regulatory Information 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 FCC Part 68 Telecom 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. This information must be provided to the telephone company. 2. As indicated below, the suitable jack (Universal Service Order Code connecting arrangement) for this equipment is shown.
Appendix C - Regulatory Information Canadian Limitations Notice Ringer Equivalence Number Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a phone interface. The termination on an interface may consist of any combination of devices subject only to the requirement that the sum of the ringer equivalence numbers of all the devices does not exceed 5.
Voice / Fax over IP Networks Glossary
Glossary A Access: The T1 line element made up of two pairs of wire that the phone 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.
Glossary 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 (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".
Glossary F Failed Seconds: A test parameter where the circuit is unavailable for one full second. Failed Signal: A T1 test parameter logged when there are more than 9 SES (Severely Errored Seconds). Fax (facsimile): Refers to the bit-mapped rendition of a graphics-oriented document (fax) or to the electronic transmission of the image over phone lines (faxing).
Glossary I Hexadecimal: A base 16 numbering system used to represent binary values. Hex uses the numbers 0-9 and the letters A-F: usually notated by an "h" (for exxample, "4CF h", read "four charley fox, hex"). The result is that one hex digit represents a 4-bit value. Implicit congestion management: A method of informing the terminal that the network is busy. This method relies on the end-system protocol to detect and fix the congestion problem.
Glossary Line Termination (LT): The electronics at the ISDN network side of the user/network interface that complements the NT1 at the user side. The LT and the NT1 together provide the high-speed digital line signals required for BRI access. Listed Directory Number (LDN): The main number assigned by the telco; the number listed in the phone directory and also provided by Directory Assistance. Some devices can have more than one LDN, such as ISDN devices that have one LDN for voice and another LDN for data.
Glossary 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. O Object-Orientated: A method for structuring programs as hierarchically organized classes describing the data and operations of objects that may interact with other objects.
Glossary Private Branch Exchange (PBX): A phone exchange located on the customer's premises. The PBX provides a circuit switching facility for phone extension lines within the building, and access to the public phone network. See also "Exchange". PROM (Programmable Read Only Memory - pronounced "prom"): A permanent memory chip that can be programmed or filled by the customer after by the manufacturer has set initial values. Contrast with ROM.
Glossary 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. RS-530: The EIA standard for the mechanical/electrical interface between DCEs and DTEs transmitting synchronous or asynchronous serial binary data. RS-530 provides for high data rates with the same connector used for RS-232. However, it is incompatible with RS-232.
Glossary T1 Channel Tests: A set of diagnostics that vary by carrier, used to verify a T1 channel operation. Can include Tone, Noise Level, Impulse Noise Level, Echo Cancellors, Gain, and Crosstalk testing. T1 Framing: To digitize and encode analog voice signals requires 8000 samples per second (twice the highest voice frequency of 4000 Hz). Encoding in an 8-bit word provides the basic T1 block of 64K bps for voice transmission.
Glossary 90
Glossary Index M Multi-Tech Fax-Back Service .......................... 68 A O Archie ............................................................. 71 On-line Warranty Registration ........................ 66 B P Back Panel ..................................................... 12 Ping ................................................................ POP ................................................................ Power Connector ...................................................
