HP auroraTempo User Manual page 270

aurora Tempo - User Guide
Cyclic Redundancy Check. This is used to ensure the integrity
CRC
of frames transmitted across the network. This is a
mathematical operation based on the Frame Check Sequence
(FCS).
Channel Service Unit. This is switching equipment which
CSU
connects the Data Service Unit to the Frame relay Network.
Demand channel. This is one of the multiplexed channels in
D Channel
the ISDN information stream. The Demand channel carries
signalling and call setup information (the 'demands') and can
also be used for packet data transmission to the subscriber.
This is digital information which may be text, voice or video.
Data
Layer 2 of the OSI reference model. This layer is concerned
Data Link
with error detection and correction to ensure the
Layer
integrity of transmitted data.
Decibels
dB
Data Communications Equipment. This is switching
DCE
equipment which connects the DTE into the
communications link - for example, a modem.
Digital Data System - a service which provides full duplex
DDS
data communication at a variety of rates.
Digital Data System Clear Channel - a data service which
DDS CC
provides data communications at 64 kbps.
Digital Data System Primary rate - a data service which
DDS PRI
provides data communications at 56 kbps.
Discard Eligibility. A bit in the Frame Relay Header that,
DE
when set, tells the network 'discard this frame first'. This
provides a method of prioritizing frames whose DE bits are
not set.
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