The XRT86SH328 has a total of 56 independent T1 framers (or 42 independent framers for E1). This Voyager Device maps 28 T1 payloads up to STS-3/ STM-1. The purpose of the 56 framers is to allow back-to-back transmit and receive framers on each of the 28 channel Egress and Ingress data paths. The channel numbering system references the framers according to the block diagram shown in Figure 1. The XRT86SH328 provides T1 framing and error accumulation in accordance with ANSI/ITU_T specifications. Each framer has its own framing synchronizer and transmit-receive slip buffers. The slip buffers can be independently enabled or disabled as required and can be configured to frame to the common T1 signal formats.