The OC3 IR 4/STM1 SH 1310 card provides four intermediate or short range SONET/SDH OC-3 ports compliant with the International Telecommunication Union's G.707, G.957, and Telcordia's GR-253. Each port operates at 155.52 Mbps over a single-mode fiber span. The card supports VT and non-concatenated or concatenated payloads at the STS-1 or STS-3c signal levels.You can install the OC3 IR 4/STM1 SH 1310 card in any multispeed or high-speed card slot. The card can be provisioned as part of a unidirectional path switched ring (UPSR) or in a linear add-drop multiplexer (ADM) configuration. Each port features a 1310 nm laser and contains a transmit and receive connector (labeled) on the card faceplate. The card uses SC connectors. The OC3 IR 4/STM1 SH 1310 card supports 1+1 unidirectional or bidirectional protection switching. You can provision protection on a per port basis. The OC3 IR 4/STM1 SH 1310 detects LOS, LOF, Loss of Pointer (LOP), line Alarm Indication Signal (AIS-L), and line Remote Defect Indication (RDI-L) conditions.