The OC12 IR/STM4 SH 1310 card provides one intermediate or short range SONET/SDH OC-12 port compliant with the International Telecommunication Union's G.707, G.957, and Telcordia's GR-253. The port operates at 622.08 Mbps over a single-mode fiber span. The card supports VT and non-concatenated or concatenated payloads at STS-1, STS-3c, STS-6c or STS-12c signal levels.You can install the OC12 IR/STM4 SH 1310 card in any multispeed or high-speed card slot and provision the card as a drop card or span card in a two-fiber BLSR, UPSR, or in ADM (linear) configurations. The OC12 IR/STM4 SH 1310 port features a 1310 nm laser and contains a transmit and receive connector (labeled) on the card faceplate. The OC12 IR/STM4 SH 1310 uses SC optical connections and supports 1+1 unidirectional and bidirectional protection.