Cisco - X.21 cable (DTE) - Smart Serial (M) to DB-15 (M) - 10 ft - refurbished - for P/N: HWIC-1SER/ HWIC-2A/S/ HWIC-2A/S=/ SPA-4XT-SERIAL/ SPA-4XT-SERIAL=/ SPA-4XT-SERIAL-RF