ADTRAN 1200410L2, Руководство пользователя

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61200410L2-1A ESU LT User Manual 65
Chapter 8
Example Operations
TESTING EXAMPLES
ADTRAN recommends running tests on the circuit before using the
ESU LT to pass data. Testing consists of sending a test pattern from
end-to-end and checking for errors in the pattern. Two types of tests
are 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.
Far End Looped Back Test
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
EST
menu tree.) Complete the
steps outlined in Table 8-1 on page 66 to loop-up the remote E1
CSU/DSU and send a test pattern.