We have a T1 circuit installed and is terminated into an RJ-48c jack. The router is a Cisco ISR4331 with a NIM-2MFT-T1/E1. NIM has a integrated CSU/DSU. My question is what pinout standard should I the cable be connect the T1's RJ-48c to the router? Would the straight-through cable with a 568b pinout work? I'm not really sure about L1 information, and my field tech doesn't have a clue. This T1 will be used for data only.