Lucent Technologies PacketStar PSAX, User Manual

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Glossary
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PacketStar
®
PSAX 12-Port Medium-Density DS1 Multiservice Module User Guide , Issue 1 Release 8.0
channel service unit See CSU.
channel suppression The inhibition of a portion of a line’s bandwidth.
channel tunneling A way of overcoming protocol restrictions on a network by
encapsulating channels that use one protocol inside channels
that use a protocol supported by the network.
channel-associated signaling See CAS.
channelization A process that subdivides the bandwidth of a circuit into
smaller increments called channels. Typically, each channel
would carry a single transmission, such as voice only or data
only. Channelization requires either a frequency division
multiplexer or a time division multiplexer.
channelized circuit emulation ser-
vice A virtual DS1 port that is subdivided into 24 DS0 channels
that provides a connection over a virtual channel-based net-
work, providing service to the end use that is indistinguish-
able from a real, point-to-point, fixed bandwidth circuit.
channelized digital signals Subdivided digital signals.
characters per second See cps.
chassis A reference to the physical hardware, frame, and mother-
board into which are inserted the power supply, stratum,
CPU, and I/O modules. The supporting legs and brackets are
not considered to be part of the chassis.
checksum The sum of a group of data items used for checking errors.
chip shortened term for microchip, a very complex, yet tiny mod-
ule that stores computer memory or provides logic circuitry
for microprocessors. A chip is manufactured from a silicon
(or, in some special cases, a sapphire) wafer, which is first cut
to size and then etched with circuits and electronic devices. A
chip is also sometimes called an integrated circuit (IC).
chipset A group of microchips designed to work together and to be
sold as a unit that performs one or more related functions.
CIR committed information rate. The speed at which a frame relay
network agrees to transfer information under normal condi-
tions, averaged over a minimal increment of time. CIR is
measured in bits per second.
circuit emulation See CE.
circuit emulation service See CES.
circuit grooming A practice that separates used from unused DS0s in wireless
backhauling. The voice circuits are separated from a T1 trunk
consisting of a mixture of voice and data circuits. The voice
circuits are then directed to a T1 switch specifically servicing
voice circuits.
circuit mode data Data that travels across a fixed bandwidth circuit established
from point-to-point through a network, and is held for the
duration of a telephone call.