Quick Eagle Networks DL3800E DSU Loopback, DSX-1 Digital Signal Cross Connect Level, DTE loopback

G

DSU Loopback

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.

DSU/CSU (Data Service Unit/Channel Service Units)

The pair of communications devices that connect an in-house line to an external digital circuit. At the customer's end of the telephone connection, the DSU/CSU takes data from terminals and computers, encodes it, and transmits it down the link. At the receive end, another DSU/CSU equalizes the received signal, filters it, and decodes it for interpretation by the end-user.

DSX-1 (Digital Signal Cross Connect Level 1)

Parameters set used when DS-1 signals are cross connected.

DTE (Data Terminal Equipment)

Terminal equipment connected to the DSU and used for communication over digital networks. May be a terminal, computer, printer or multiplexer.

DTE loopback

An EIA-232-D signal which indicates that the DTE is ready for operation.

DTR (Data Terminal Ready)

Signal from DTE to DSU/CSU.

E

EER (Excessive Error Rate)

Determined by counting the number of T1/T3 code violations during a time interval.

EFS (Error Free Seconds)

Occurs when a second is free of CRC-6 violations or Out of Frame (OOF) events or one or more BPV or OOF events.

EIA (Electronic Industries Association)

An organization which sets data communication industry standards.

encoding/decoding

The process of reformatting information into a format suitable for transmission, and then recovering it after transmission.

G-6 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001