CTC Union ETU-01A User Manual

Chapter 5.Loop Back & BERT Testing
61
May 2011
Data Port V.54 remote loop back
The Data Port V.54 remote loop back is performed by sending standard V.54 loop back codes
to the remote unit. The remote unit then connects its local data channel receive data (RD) to the
channel transmit input (TD). 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 5-8.
Figure 5-8. Data Port V.54 remote loop back
Integrated Bit Error Rate Test (BERT).
During Data Port BERT testing, the local DTE is disconnected and the DSR line is off. An
internal pattern generator connects a user selected test pattern sequence to the transmit input of the
local data channel interface. To calibrate the system, the user can inject errors at a selectable rate.
The receive output is connected to a pattern tester. The tester compares the received and transmitted
patterns and detects errors.
During E1 Line BERT testing, an internal pattern generator connects a user selected test
pattern sequence to the transmit input of the local E1 line interface. To calibrate the system, the
user can inject errors at a selectable rate. The receive output is connected to a pattern tester. The
tester compares the received and transmitted patterns and detects errors.
BERT local loop back
For a local test, use the E1 Line local analog loop back (or hardwire main link RX connector
to TX) or the Data Port local analog loop back, to return the data back to the local DTE, as shown
in Figure 5-9.
Figure 5-9. BERT for local test
(BERT on Data Port shown, E1 Link analog loop back.)
“1”
User
DTE
Data
Port
E1
E1 LINE
LOCAL ETU-01A
Generator
Tester
DSU
CSU
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