AT&T Telephone DS1/DMi/ISDN-PRI Instrukcja Użytkownika Pobierz pdf (Strona 370)

GL-12

GLOSSARY

Integrated

Services Digital

Network

primary rate

interface

(ISDN-PRI)

interexchange

carrier (IXC)

interface

internal clock

reference

interworking

ISDN

ISDN dynamic

trunk

ISDN network

identifier

ISDN network-

service value

The interface between multiple communications systems that in North America

includes 24 64K-bps channels, corresponding to the North American digital

signal level 1 (DS1) standard rate of 1.544M-bps. The most common

arrangement of channels in ISDN-PRI is 23 64K-bps B-channels for transmitting

voice and data and 1 64K-bps D-channel for transmitting associated B-channel

call-control and out-of-band signaling information — an arrangement called

23B+lD, although with nonfacility-associated signaling (NFAS) ISDN-PRI can

include 24 B-channels and no D-channel. See also 24th-channel signaling,

Integrated Services Digital Network, Integrated Services Digital Network basic

rate interface, nonfacility-associated signaling, and out-of-band signaling.

The telecommunications company providing inter-LATA (local access and

transport area) public network transmission, such as AT&T, MCI, or Sprint.

See also ISDN network identifier.

A common boundary between two systems or pieces of equipment.

The internal high-accuracy clock reference used by switching nodes within a

private network to maintain proper network synchronization. See also external

clock reference.

The linking of dissimilar networks to provide end-to-end call or feature

processing.

See Integrated Services Digital Network.

The trunk type that permits a transmission facility to be used for a variety of

different trunk types on a call-by-call basis. A dynamic trunk differs from the

more conventional, fixed-usage arrangement where each transmission facility is

only associated with a single trunk type.

A 3-digit field in a call-detail record that identifies a tariffed public-network

service such as WATS, MEGACOM

, and the Software-Defined Network

(SDN), requested for a call. The INS value field is necessary to accommodate

Call-by-Call (CBC) Service Selection in an Integrated Services Digital Network

(ISDN), which allows a communications system to request services and/or

features on a per-call basis. Also called ISDN network-service value.

See ISDN network identifier.

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