The Dual Cell Bearing T-1 Module is a compact sub-assembly that occupies one of the 15 slots available in the CX-1500. It can connect to other equipment as a DSX-1 interface or terminate a public T-1 on its built in T-1 CSU. The Dual Cell Bearing T-1 Module terminates two independent T-1 facility interfaces, recovers clock, accesses the ATM cells within the T-1 payload, and sends these cells to the switching fabric. In the transmit direction the process is reversed. ATM cells are taken off the switching fabric and mapped into the T-1 framed payload, which is then formatted per ATM Forum specifications and clocked out on the T-1 facility.