The OC12 LR/STM4 LH 1310 card provides one long-range, ITU-T G.707, ITU-T G.957, and Telcordia-compliant, GR-253 SONET OC-12 port per card. 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 LR/STM4 LH 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 (Bidirectional line switched ring), UPSR, or ADM (linear) configuration. The OC12 LR/STM4 LH 1310 card port features a 1310 nm laser and contains a transmit and receive connector (labeled) on the card faceplate. The card uses SC optical connections supporting 1+1 unidirectional and bidirectional protection. The OC12 LR/STM4 LH 1310 detects LOS, LOF, LOP, AIS-L, and RDI-L conditions. The card also counts section and line BIT errors.