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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.