CTC Union ETU-01A User Manual

Chapter 5. Loop Back and BERT Testing
97
November 2001
E1 line remote payload loop back
E1 line remote payload loop back is performed by sending a loop
back code to the remote unit. The remote unit then connects its E1
link receive signal to the output of the transmit path, before the
Digital Service Unit (DSU). This loop back test checks the
performance of the local ETU-01A, the remote ETU-01A and
the connections between them, as shown in Figured 5-5.
Figure 5-5. E1 link remote payload loop back
DTE
DSU
E1
CSU
LOCAL ETU-01A
DTE
DSU
CSU
REMOTE ETU-01A

CTC Union ETU-01A Specifications

General

Brand	CTC Union
Model	ETU-01A
Category	Control Unit
Language	English