MultiMobile MT128ZLX User Guide Appendix F: ISDN Glossary
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Exchange
The local telephone facility that provides telephone service in your area.
Inside Wiring
Wiring work that would be needed on your side of the D emarc for your ISDN line and which would thus be the
responsibility of the ISDN subscriber. The telephone company will typically do this work for you for an additional
charge.
ISDN
Integrated Services Digital Network: A digital telephone network used to carry voice, data, images, and video at
high speeds. Can use existing copper phone line.
ISDN Ordering Code
The telephone company uses this predefined number to determine how to provision your ISDN line based on your
ISDN hardware requirements.
Line Extension
A method used to provide ISDN service beyond the normal distance limit between the central office and your site.
Line or Loop Qualification
A test the phone company runs to measure the line quality and distance to your location from the central office to
determine if your line meets the requirements for ISDN service.
Mu-Law
Voice encoding scheme used in Canada, the U.S., Japan, and in other locations influenced by North American
telephony standards.
Multi-Link PPP
Allows you to “bond” or combine two or more B channels to form a single, faster PPP connection. This
configuration will allow you to realize the full 128 kilobit/second bandtwidth available from your ISDN service.
NI-1 (National ISDN-1)
The “Standard” ISDN phone line specification. Intended to be used as a standard to which manufacturers must
conform.
NT-1 (Network Terminiation-1)
A device that connects your ISDN hardware to an ISDN U-interface and an ISDN S/T-interface.
PBX
Private Branch Exchange. A PBX is a telephone switch that provides switching for an office or campus.
Point-to-Point Protocol (PPP)
A transport protocol that allows a computer to use TCP/IP to connect to other computers over a standard telephone
line.
POTS
Plain Old Telephone Service. An analog telephone line.
Primary Rate Interface
An ISDN service that offers 23 B channels at 64 kbps and one D channel at 64 kbps (23B+D). In Europe PRI
consists of 30 B channels at 64 kbps and two D channels (30B+D)
Provisioning
A telephone company term for configuring your ISDN line with various features, such as caller ID, call bumping,
call waiting, etc…