Multi-Tech Systems Multivoip 200 Model Mvp200 Voice/fax Over Ip Networks User Guide

81 Appendix C - Regulatory Information
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.
and
Council Directive 73/23/EEC of 19 February 1973 on the harmonization of the laws of Member States relating to
electrical equipment designed for use within certain voltage...

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Voice / Fax over IP Networks
Glossary 

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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.
ACK (ACKnowledgement code) (pronounced ack):  A communications code sent from a receiving...

85 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.
Bell Pub 62310:  The Bell publication defining requirements for data format conversion, line conditioning, and...

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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. ISDN has two 64K bps circuits, and a 16K bps packet service...

87 Glossary
Digital Loopback:  A technique used for testing the circuitry of a communications device. Can be initiated locally, or remotely (via a telecom-
munications 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.
Digital Service, level 0  (DS0):...

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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). Fax transmission differs from data transmission in that the former is a bit-mapped approximation of a graphical docu-
ment...

89 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 (e.g., 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.  (TCP/IP is an example of a protocol using only implicit congestion...

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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...