XRT86SH221

The XRT86SH221 (Voyager-Lite) is a physical layer SDH to PDH mapper/demapper which enables E1 aggregation to STM-1 via standard VC-12 to AU-3 and TUG-3/AU-4 mapping protocols. Voyager-Lite supports all the framing, mapping and grooming functions required for STM-1 mapper applications. The XRT86SH221 device generates and terminates all SDH Regenerator Section, Multiplexer Section and Path Overhead including the low-order Virtual Container (VC) Path Overhead. E1 framing is transparent; therefore, the device neither generates nor terminates the E1 frame.

A single Voyager-Lite performs mapping of 21 asynchronous E1 spans to either VC-12/TU-12/TUG-2/ VC-3/AU-3/STM-0 or VC-12/TU-12/TUG-2/TUG-3/STM-1. Mapping to STM-1 requires (3) Voyager-Lite devices with one acting as "master" framer and two acting as "slave" framers. In this configuration of XRT86SH221, Voyager-Lite performs all the necessary framing, pointer processing and mapping functions required for mapping of 63xE1 spans to either VC-12/TU-12/TUG-2/VC-3/AU-3/STM-1 or VC-12/TU-12/TUG-2/TUG-3/VC-4/AU-4/STM-1.