I have read many posts regarding errors with T1 lines and am just curious as to what some of you do in regards to troubleshooting.
The following are statistics from our line over the last 3 hours:
Serial0/1/0 is up, line protocol is up Hardware is GT96K with integrated T1 CSU/DSU MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 4/255 Encapsulation HDLC, loopback not set Keepalive set (10 sec) Last input 00:00:00, output 00:00:00, output hang never Last clearing of "show interface" counters 02:49:11 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 30 second input rate 25000 bits/sec, 8 packets/sec 30 second output rate 6000 bits/sec, 9 packets/sec 1221441 packets input, 1319175854 bytes, 0 no buffer Received 1184 broadcasts, 0 runts, 0 giants, 0 throttles 239 input errors, 239 CRC, 233 frame, 3 overrun, 0 ignored, 221 abort 1271540 packets output, 178607111 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 output buffer failures, 0 output buffers swapped out 0 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=u
Module type is T1/fractional Hardware revision is 0.50, Software revision is 20051025, Image checksum is 0x3EFB7B, Protocol revision is 0.1 Receiver has no alarms. Framing is ESF, Line Code is B8ZS, Current clock source is line, Fraction has 24 timeslots (64 Kbits/sec each), Net bandwidth is 1536 Kbits/sec. Last module self-test (done at startup): Passed Last clearing of alarm counters 02:50:00 loss of signal : 0, loss of frame : 0, AIS alarm : 0, Remote alarm : 0, Module access errors : 0, Total Data (last 11 15 minute intervals): 504 Line Code Violations, 249 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 161 Line Err Secs, 38 Degraded Mins 162 Errored Secs, 44 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in current interval (291 seconds elapsed): 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 11 15 minute intervals): 504 Line Code Violations, 249 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 161 Line Err Secs, 38 Degraded Mins 162 Errored Secs, 44 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in current interval (316 seconds elapsed): 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 1: 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 2: 38 Line Code Violations, 17 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 7 Line Err Secs, 4 Degraded Mins 7 Errored Secs, 3 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 3: 28 Line Code Violations, 14 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 4 Line Err Secs, 1 Degraded Mins 4 Errored Secs, 1 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 4: 4 Line Code Violations, 2 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 2 Line Err Secs, 2 Degraded Mins 2 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 5: 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 6: 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 7: 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 8: 222 Line Code Violations, 110 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 81 Line Err Secs, 10 Degraded Mins 82 Errored Secs, 19 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 9: 46 Line Code Violations, 22 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 14 Line Err Secs, 7 Degraded Mins 14 Errored Secs, 5 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 10: 104 Line Code Violations, 52 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 35 Line Err Secs, 9 Degraded Mins 35 Errored Secs, 9 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 11: 62 Line Code Violations, 32 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 18 Line Err Secs, 5 Degraded Mins 18 Errored Secs, 7 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
As you can see, I am getting quite a few line code violations at different times, somewhat intermittent. I can run ping tests with different patterns and sizes across the line and they usually run clean. I have had the telco test, and of course they have cleared the line. I have replaced the CPE (but not the cabling, which is about a
50-100ft demarc extension). Are there certain patterns and time periods I should ask the telco to test? Thanks in advance for any replies.