Table of Contents
Advertisement
Chapter 8
TESTING EXAMPLES
Far End Looped Back Test
61200410L2-1A
Example Operations
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.
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
steps outlined in Table 8-1 on page 66 to loop-up the remote E1
CSU/DSU and send a test pattern.
ESU LT User Manual
menu tree.) Complete the
EST
65
Advertisement
Table of Contents
