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Chapter 8
TESTING EXAMPLES
Far End Looped Back Test
61200410L1-1B
Example Operations
Before using the ESU LT to pass data, ADTRAN recommends
running tests on the circuit. Testing consists of sending a test
pattern from end-to-end and checking for errors in the
pattern. There are two types of tests used to accomplish this:
•
Loop-up the far end and then send a test pattern.
•
Send a test pattern from both ends and check at both
ends.
E1 CSU/DSUs should respond to a loop-up code sent over
the E1 circuit. The remote unit will "loop" the network
interface providing a path for data from the local unit over
the circuit and back again. Sending a known test pattern over
this loop and checking for errors verifies circuit connectivity.
The following example loops the remote unit and sends 511
or QRSS pattern through the data path. Use the 511 or QRSS
test pattern with any E1 configuration (regardless of the
channel configuration) because 511 and QRSS are always sent
in the occupied channels. (See Test Menu on page 57 for a
complete T
menu tree.) Complete the steps outlined in
EST
Table 8-1 on page 66 to loop-up the remote E1 CSU/DSU and
send a test pattern.
ESU LT User Manual
65
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