CRC error prob?

[vinothlb1]

when i get a local loop from v.35 modem i m having no error but when i get a local loop from g.703 i m having error. both v.35 and g.703 is in our place . can any one help me..

[johnlloyd_13]

could you post your show interface output? try to issue this command repeatedly for several minutes. this will indicate if you have CRC errors and if it's incrementing. have you considered replacing cables?

[vinothlb1]

when i give physical loop from my side to ISP provider is not getting any error. But when i give loop from my modem they r getting errors..I have replaced v.35 cables. I have changed the interface where v.35 cable connected. even i changed the modem . what could be the reason why CRC errors keep on getting increased..