Glossary - Paradyne FrameSaver 9620 User Manual

Glossary

alternate destination
ASCII
terminal/printer
asynchronous
Autobaud mode
B channel
BKP
BRI
channel
CIR
compression
configuration
shortcuts
DBM
DDS
DE
DLCI
DTR
9621-A2-GB20-30
A designated port, DLCI, and EDLCI that provides an alternate path for backup when the
primary link or path is out of service.
Devices that can be attached, either locally or remotely, to display or print the access unit's
alarm messages.
A data transmission that is synchronized by a transmission start bit at the beginning of
a character (five to eight bits) and one or more stop bits at the end.
Access unit forces automatic redetermination of the DDS line rate/speed (56 or 64 kbps)
as soon as a valid DDS network signal is detected.
ISDN Bearer Channel. A 56 or 64 Kbps channel that carries customer information like
voice calls, circuit- or packet-switched data. Used for circuit-switched information by
FrameSaver access units.
Faceplate LED and rear panel label for the access unit's Backup interface.
Basic Rate Interface. An ISDN service rate of 144 Kbps, provided as two B-channels of
64 Kbps for information transfer and one D-channel of 16 Kbps for control and signaling.
An independent data path.
Committed Information Rate. Less than or equal to the access rate, the CIR is used by the
service provider for rate enforcement when the network is congested. When rates exceed
the CIR, frames may be discarded. The management path has a CIR from 0 kbps to
64 kbps.
With an access unit equipped with the data compression feature, serial data coming in
from the DTE over Port 1 is compressed at ratios up to 4:1, encapsulated into a
standards-based compression-transport protocol, then transmitted over the DDS network
to frame relay PVCs. Also called data compression or synchronous data compression.
A feature that simplifies basic setup (configuration) of the access unit. Based upon the
application selected, the access unit automatically configures certain options like DLCIs
from information obtained from the network.
Dial Backup Module. The optional internal ISDN BRI feature that provides automatic dial
backup and service restoration of failed digital circuits. Provides an ISDN U-interface.
Digital Data Service, such as DATAPHONE Digital Service or ACCUNET Spectrum of
Digital Services, that provides digital communication circuits.
Discard Eligibility. Part of the frame header that marks a frame for low priority if there is
congestion on the network. If congestion occurs, DE frames are the first to be discarded by
the network.
Data Link Connection Identifier. The virtual circuit number corresponding to a particular
connection between two destinations. This number is used as part of the frame relay
header. The DLCI is always between devices, not just between endpoint devices. The total
number of DLCIs between endpoints make up the PVC. DLCIs are a local means of
identifying a PVC.
Data Terminal Ready. An EIA-lead standard for V.24 circuit CD, ITU 108; an input signal
(DTE-to-DCE).
August 1997
GL-1