ASAK HAider,
In simple language CRC and input errors refer to Layer 1 issues could be a faulty port or cable.
Few thingsto be checked when CRC/frame errors:
1.Both the end of the interfaces should have same speed and duplex settings.
2. Check the phyisical cabling , if possible change the cable and ports.
3. Check the MTU setting between both the interfaces.
B-
If your switch supports TDR, use the "test cable-diagnostics tdr" command.
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/50sg/command/reference/snmp_vtp.html#wp1208382
HTH
Regards
Inayath
*Plz rate if this info is helpfull.