I have installed a WIC-1DSU-56K card into a Cisco 1721 router and the card came with a CAB-DSU-RJ45 cable. My telco tells me I require a RJ48S or RJ48C cable to connect to the Frame circuit. I read on a vendor site that the CAB-DSU-RJ45 is equivalent to RJ48S but have been unsuccesul in validating this on Cisco site. Can anyone confirm\refute that the cable I have will work?