Hi,
HWIC-8A/S uses the smart serial cable which is used by WIC-2T.
On the HWIC side you would need smart serial while on the WIC side you'll need regular serial cable.
Following are your options -
HWIC-8A/S - CAB-SS-232FC,CAB-SS-449FC,CAB-SS-V35FC,CAB-SS-X21FC
WIC-1T - CAB-232MT,CAB-449MT,CAB-V35MT,CAB-X21MT.
Replace FC by MT and viceceras for female and male connectors in the above part numbers.
Please make sure at one end you go for male and at the other end for female + same standard like V.35 on both the ends.
-> Sushil