Monitoring and Troubleshooting302768-C Rev 00 6-13The following example shows how to send loop-up and loop-down signals overslot 2, connector 1, FT1 channel 5, logical line 6, time slot 7:ft1/2/1/5# send-feac-loop-up-code 7ft1/2/1/5# send-feac-loop-down-code 7ft1/2/1/5#Clearing the Loopback State of an FT1 ChannelA logical-line-test object that accepts a remote loop-up signal stays in a loopbackstate until it receives a loop-down signal.To clear a loopback state, go to the logical-line-test prompt (for example,logical-line-test/2/1/5/6) and enter the following command:clear-fractional-loop-state {no-action | <timeslot>}no-action does not clear the fractional loop state. This option is the defaultsetting.timeslot is a timeslot from 1 to 24 on which you want to clear the fractional loopstate.The following example shows how to clear the loopback state on slot 2,connector 1, FT1 channel 5, logical line 6:logical-line-test/2/1/5/6# clear-fractional-loop-state 6logical-line-test/slot/ds3/ds1/logical-line#Configuring BERT TestingThe bit error rate test (BERT) involves transmitting a known pattern of bits andthen counting the errors received to determine the bit error rate (BER). This isdone to measure the quality of the data tranmission. The BER is the ratio ofreceived bits that are in error, relative to the number of bits received. It is usuallyexpressed in powers of 10.The following sections describe how to conduct a BERT:• Selecting a BERT Pattern for a Channel• Selecting the Type of BERT Error to Insert on a Channel• Selecting the Type of Alarm Signal to Be Generated in BERT Mode
