The OC48 IR 1310 card provides one intermediate-range, Telcordia-compliant, GR-253 SONET OC-48 interface. Each interface operates at 2488.320 Mbps over a single-mode fiber span and supports VT payloads and non-concatenated or concatenated payloads of STS-1, STS-3C, STS-6C, STS-12C, or STS-48C.