User`s guide

G-4 DL600E E1 Data Multiplexer UserÕs Guide
DSR (Data Set Ready)ÑA data port signal.
DSU LoopbackÑ A DSU loopback is intended to include as much of the
customer data communications circuitry in the looped-back path as possible.
The signal passes from the remote unit into the local unit as far as the
DSU.
This test loops the received network signal back to the network.
DSX-1 (Digital Signal Cross Connect Level 1)ÑParameters set used when
DS1 signals are cross connected.
DTE (Data Terminal Equipment)ÑTerminal equipment connected to the
DSU and used for communication over digital networks. May be a terminal,
computer, printer or multiplexer.
DTE loopbackÑAn EIA232-D signal which indicates that the DTE is ready
for operation.
DTR (Data Terminal Ready)ÑSignal from DTE to DSU/CSU.
E
E1ÑEuropean counterpart to T1, which transmits at 2.048 Mbps.
30 channels.
E2ÑEuropean counterpart to T2, which transmits at 8.448 Mbps.
120 channels.
E3 ÑEuropean counterpart to T3, which transmits at 34.368 Mbps.
480 channels.
E4 ÑEuropean counterpart to T4, which transmits at 139.264 Mbps.
1920 channels.
EER (Excessive Error Rate)ÑDetermined by counting the number of T1/T3
code violations during a time interval.
EFS (Error Free Seconds)ÑOccurs when a second is free of CRC-6 viola-
tions or
Out of Frame (OOF) events or one or more BPV or OOF events.
EIA (Electronic Industries Association)ÑAn organization which sets data
communication industry standards.
EIA 530ÑElectrical standard and interface.
encoding/decodingÑThe process of reformatting information into a format
suitable for transmission, and then recovering it after transmission.