Multi-purpose SONET/SDH VT/TU and SONET/SDH STS/STM cross-connect. With a memory-switch architecture, implements a strictly non-blocking switch that supports a VT/TU level fabric of up to 45 Gbit/s. Supports 18 high-speed Enhanced SONET Serial Interface (ESSI) CML links each independently configurable for STS-48/STM-16 at 2.488 Gbit/s or STS-12/STM-4 at 622.08 Mbit/s operation. Supports 12 low-speed links operating at 51.84 Mbit/s. The frame alignment of the low-speed links is independent of the high-speed links. Supports system frame synchronization using an external frame pulse or ESSI smart frame synchronization using the frame boundary of the receive links.