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Glossary
GL-16
Cisco IPICS Server Installation Guide
OL-8155-01
stored VTG
Also referred to as inactive VTG.
subscriber unit
A mobile or portable radio unit that is used in a radio system.
system
administrator
The Cisco IPICS system administrator is responsible for installing and setting up
Cisco IPICS resources, such as servers, routers, multicast addresses, locations,
and PTT channels. The system administrator also creates ops views, manages the
Cisco IPICS licenses and PMC versions, and monitors the status of the system
and its users via the activity log files.
system architecture
The design principles, physical structure, and functional organization of a land
mobile radio system. Architectures may include single site, multi-site,
simulcast, multicast, or voting receiver systems.
T
T1
Digital WAN carrier facility. T1 transmits DS-1-formatted data at 1.544 Mbps
through the telephone-switching network, using alternate mark inversion (AMI)
or binary 8 zero suppression (B8ZS) coding.
T1 loopback
Allows mapping from multicast to unicast so that unicast phone calls can be
patched into an LMR or into other multicast audio streams. A loopback is
composed of two of the available T1 interfaces.
talk group
A subgroup of radio users who share a common functional responsibility and,
under normal circumstances, only coordinate actions among themselves and do
not require radio interface with other subgroups.
TCP
Transmission Control Protocol. A connection-oriented transport layer protocol
that provides reliable full-duplex data transmission. TCP is part of the TCP/IP
protocol stack.
TDMA
time division multiple access. Type of multiplexing where two or more channels
of information are transmitted over the same link by allocating a different time
interval (“slot” or “slice”) for the transmission of each channel; that is, the
channels take turns to use the link.