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time slot
Glossary
time slot
64 kbps of digital information structured as eight bits every 125 microseconds.
In the switch, a time slot refers to either a DS0 on a T1 or E1 facility or a
64-kbps unit on the TDM bus or fiber connection between port networks.
trunk
A communication line linking two switches (public-network, PBX, or
MMCX-server).
trunk group
A collection of trunks that all terminate at the same public switch, PBX, or
MMCX server.
U
UDP
1. User Datagram Protocol — Transport layer; Connectionless, unreliable, fast.
2. Uniform Dial Plan.
UNP
Uniform numbering plan
unrestricted data
Data that has to travel over an unrestricted facilities, because it can be corrupted
by Zero Code Suppression (ZCS) line coding. Digital data is unrestricted data.
unrestricted facilities
PRI spans that use non-ZCS line coding, such as B8ZS or HDB3, end-to-end.
See Zero Code Suppression (ZCS).
V
VCI
The ATM virtual channel identifier. ATM is a connection-oriented service that
sets up a virtual circuit between the transmitter and the receiver. The two
endpoints negotiate an agreed route through the network before sending any
data. VCI and VPI together constitute the virtual circuit number that identifies
this route.
virtual channel identifier
See VCI.
488
Administration for Network Connectivity
CID: 77730 555-233-504 — Issue 1 — April 2000