Three new single-port OC-3/STM-1 ATM Circuit Emulation Service (CES) network modules are now available for the Cisco 3600 series multiservice access routers that provide ATM Forum -compliant CES. All three network modules support STS-3c or STM-1 ATM Forum framing standards over multimode and single-mode intermediate reach, and single-mode long reach fiber optic interfaces.The OC-3/STM1 CES network modules have an available slot for the insertion of either a one or two-port multiflex VWIC to establish connectivity to the PBX for either structured or unstructured CES. There are currently six versions of the multiflex VWICs that are supported by the OC-3/STM-1 CES network modules.