The Cisco CAB-SS-V35MT-EXT is a serial cable designed specifically for Cisco routers with a Smart Serial interface. It features a V.35 Male DTE connector on one end and a Cisco Smart Serial connector on the other, with extended control leads for added flexibility. The cable is 10 feet long (3 meters) in total length, making it suitable for various networking setups. This unit is a high-quality networking cable from Cisco, a trusted brand known for its reliable networking products.