The DataPro 6626 series cable is a replacement cable for the Cisco CAB-SS-232FC cable, one of the Cisco family of "Smart Serial" cables.
The router end terminates in a Foxconn High-Density 26-pin connector, the WAN end terminates in a 25-pin female DSUB connector.
Also, it's blue. A very nice blue.
Custom lengths are available; the maximum length is 10 Feet.