I am getting input errors and CRC on cisco 2800 router, and the reliabilty is 145/255 it is up but too slow

[CSCO10166315]

Serial0/3/1 is up, line protocol is up   Hardware is GT96K Serial   MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,      reliability 145/255, txload 1/255, rxload 1/255   Encapsulation PPP, LCP Open, multilink Open   Link is a member of Multilink bundle Multilink1, loopback not set   Keepalive set (10 sec)   CRC checking enabled   Last input 00:00:00, output 00:00:00, output hang never   Last clearing of "show interface" counters 00:25:16   Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0   Queueing strategy: fifo   Output queue: 0/40 (size/max)   5 minute input rate 2000 bits/sec, 5 packets/sec   5 minute output rate 4000 bits/sec, 5 packets/sec      5626 packets input, 497386 bytes, 0 no buffer      Received 0 broadcasts, 0 runts, 0 giants, 0 throttles      35414 input errors, 35414 CRC, 9780 frame, 1865 overrun, 0 ignored, 14006 a bort      5945 packets output, 580197 bytes, 0 underruns      0 output errors, 0 collisions, 0 interface resets      0 unknown protocol drops      0 output buffer failures, 0 output buffers swapped out      0 carrier transitions      DCD=up  DSR=up  DTR=up  RTS=up  CTS=up

[Mohamed Sobair]

Hi,

Is this link back to back or going through a telco CSU/DSU.

The symtoms indicate a physical layer problem, you need to engage with the Telco in order to have or perform Loop test.

HTH

Mohamed

[Thotsaphon Lueangwattanaphong]

Hi,

   You can try to change the serial cable for testing If you have got the new one. If the problem still exists,I would make a call ISP for helping me troubleshoot CSU/DSU,including loop test.

   Ref: http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1915.html#wp1020852

HTH,

Toshi