Cisco BPX-BXM-155-8DX Installation And Configuration Manual page 607

D
A digital signal format with 24 eight-bit channels plus one synchronizing bit per T1 line. Channels are
D4-format
assigned in a straight, numeric sequence.
Equipment, usually found in the telephone company central office, that is used to groom and retime the
DACS (Digital
Access and Control 24 channels in a DS1 signal. Individual DS0 channels can be cross-connected from one DS1 source and
System) inserted in another DS1 source either with the same or with a different channel number.
The adjunct processor used in INS Dial-Up Frame Relay applications to provide frame relay dial-up
DAS Server Shelf
and dial-backup circuits. The DAS Server Shelf is co-located with and connected to an IGX switch.
As defined by the RS-232 standard, any device that transmits or receives information. Usually used
DCE (Data
Communications with data terminal equipment (DTE, like a computer or network node).
Equipment)
D channel A message-oriented ISDN signalling channel, typically carried in DS24 of a PRI on T1 facilities or
TS16 of a PRI on E1 facilities. Compare to B channel.
An AT&T dial-up data service offering for 2.4 to 56 Kbps over subscriber loop cable. Requires a Data
DDS (Digital Data
Service) Service Unit, DSU, at customer premise for interface to the DDS trunk.
The first 8 bits of a FastPacket Address.
Device Code
An optional feature that saves data channel bandwidth by analyzing data channel content and
DFM (Data Frame
Multiplexing) suppressing repetitive data patterns.
Another name for the INS Dial-Up Frame Relay application.
Dial Access
Switching
An INS application that uses a DAS Server Shelf and software to enhance Cisco WAN switching
Dial-Up Frame
Relay networks with frame relay soft permanent virtual circuits (SPVCs) for dial-up dial-backup connections.
A field in a frame relay data packet that identifies the destination for the data.
DLCI (Data Link
Connection
Identifier)
A grouping of nodes sharing common interests or attributes.
domain
A unique name consisting of the letter "D" immediately followed by a number (1–8) delineated by a
domain name
"." (period) from the node name (1–8 characters maximum). Example: D1.alpha.
A number from 1–8 assigned with the cnfdmn command. The number assigned is part of the domain
domain number
name.
Digital Private Network Signalling System. A common-channel message-oriented signalling protocol
DPNSS
commonly used by private branch exchanges (PBXes). The INS Voice Network Switching application
supports DPNSS signalling.
A 64 Kbps channel used to transmit encoded voice and/or data. There are 24 DS0 channels in a circuit
DS0 (Digital Signal
0) T1 (DS1) line. DS0 data is transmitted using one or more DS0 circuits in a T1 or E1 circuit line.
An extension of DS0 that defines the format for assembling various low-speed data circuits (1.2 to 19.6
DS0A
Kbps) into a single 64 Kbps DS0 channel.
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Cisco BPX 8600 Series Installation and Configuration
Glossary
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