The OPTI-6100 OC-12 Tributary Module, Enhanced (O12TME) provides an OC-12 (622.08Mb/s) tributary interface to the supported chassis, and retimes and maps one STS-12C, or up to four STS-3Cs or twelve STS-1s and/or VT1.5s from the OC-12 interface to the Optical Multiplexer (OMM) Modules. This module requires the OMM-48 (1184548L1) be utilized as the high-speed module(s).