Chapter 5. Loop Back and BERT Testing
101
November 2001
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
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