Cisco Optical Services Modules (OSMs) for channelized Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH) services provide for the rapid, efficient addition of circuits within existing optical connections. When an OC-12/STM-4 circuit is established, all channels from OC-3c/STM-1 to DS0 can be remotely provisioned, eliminating the need for the multiplexer line-card installations that are normally required to increase the available number of electrical circuits.