The Cisco ONS 15454 SONET 12-Port DS-3 Transmultiplexer Card provides 12 Telcordia-compliant, GR-499-CORE DS-3 C-Bit or M2/3 framed interfaces operating at 44.736 Mbps. The card demultiplexes a channelized DS-3 into 28 DS-1s, maps each DS-1 to a VT1.5, then multiplexes the 28 VT1.5s into a VT-mapped .... More >
The Cisco ONS 15454 SONET 12-Port DS-3 Transmultiplexer Card provides 12 Telcordia-compliant, GR-499-CORE DS-3 C-Bit or M2/3 framed interfaces operating at 44.736 Mbps. The card demultiplexes a channelized DS-3 into 28 DS-1s, maps each DS-1 to a VT1.5, then multiplexes the 28 VT1.5s into a VT-mapped STS-1 before hand-off to the Cisco ONS 15454 cross-connect card. The integration of transmultiplexing capabilities into the Cisco ONS 15454 Multiservice Provisioning Platform (MSPP) reduces the need for outboard M13 multiplexers or wideband digital cross-connect systems to access and groom DS-1 signals from channelized DS-3 interfaces. The 12-port DS-3 transmultiplexer card offers grooming flexibility by supporting two ways to receive the DS-3 signal, ported or portless. Ported terminations refer to DS-3 interfaces that are received through 75-ohm coaxial cables from the shelf assembly's electrical interface adapter (EIA) panels. Portless termination is a channelized DS-3 signal received over an STS-1 circuit from a SONET optical line (OC-n). The portless capability eliminates the need to terminate a channelized DS-3 signal on the shelf assembly and then re-insert.The 12-port DS-3 transmultiplexer card supports multiple card-protection options, including 1:0 (unprotected), 1:1 and 1: N, N =5 for ported terminations, or N =7 for portless terminations. It can be provisioned to operate as either a working or a protection card, reducing spares inventories and their associated cost. The 12-port DS-3 transmultiplexer card supports circuit-level interoperability with the existing Cisco ONS 15454 SONET 6-Port DS-3 Transmultiplexer Card. The system supports in-service upgrades from the 6-port card to the 12-port card, allowing the user to increase the number of interfaces supported on a shelf assembly or reduce the number of shelf slots required to terminate a given quantity of DS-3 interfaces.To aid with troubleshooting and fault isolation, the 12-port DS-3 transmultiplexer card supports near-end and far-end performance-monitoring capabilities at the SONET, DS-3, and DS-1 levels. The card incorporates three faceplate-mounted status indicators: a red fail LED for hardware-level problems; dual color, green/yellow active/standby LED to indicate when the card is being used as the active or protection card; and a yellow signal fail LED for problems being received on incoming ports. The condition of the card's individual interface ports can be queried using the shelf's liquid crystal display (LCD) panel as well as the browser-based Cisco Transport Controller craft interface.
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