DEFINITY® Enterprise Communications Server Release 7

Issue 4

Console Operations 555-230-700

June 1999

Glossary and Abbreviations

 

 

 

 

 

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I

inside call

A call placed from one telephone to another within the local communications system.

Integrated Services Digital Network (ISDN)

A public or private network that provides end-to-end digital communications for all services to which users have access by a limited set of standard multipurpose user-network interfaces defined by the CCITT. Through internationally accepted standard interfaces, ISDN provides digital circuit-switched or packet-switched communications within the network and links to other ISDNs to provide national and international digital communications. See also Integrated Services Digital

Network Primary Rate Interface (ISDN-PRI).

Integrated Services Digital Network Primary Rate Interface (ISDN-PRI)

The interface between multiple communications systems that in North America includes 24

64-kbps channels, corresponding to the North American digital signal level-1 (DS1) standard rate of 1.544 Mbps. The most common arrangement of channels in ISDN-PRI is 23 64-kbps B-channels for transmitting voice and data and 1 64-kbps D-channel for transmitting associated B-channel call control and out-of-band signaling information. With nonfacility-associated signaling (NFAS), ISDN-PRI can include 24 B-channels and no D-channel. See alsoIntegrated Services Digital Network (ISDN) .

intercept tone

A tone that indicates a dialing error or denial of the service requested.

internal call

A connection between two users within a system.

ISDN trunk

A trunk administered for use with ISDN-PRI. Also called ISDN facility.

L

line

A transmission path between a communications system or CO switching system and a phone or other terminal.

line appearance

See appearance.

LWC

Leave Word Calling

M

multiappearance phone

A terminal equipped with several call-appearance buttons for the same extension, allowing the user to handle more than one call on that same extension at the same time.

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Lucent Technologies 7101A, 7103A, 2500 manual Network Primary Rate Interface ISDN-PRI