GENERAL DESCRIPTION
   Tethys™ 448 is optimized for SONET/SDH applications as a full-duplex sixteen STS-48/STM-16 or a mix of sixteen STS-12/STM-4 and STS-3/STM-1 MUX/DEMUX with full framer functionality including pointer processing, and overhead termination; ideal for aggregation, ADM and DWDM applications. In the demultiplex ingress direction, Tethys™ 448 accepts either sixteen STS-48/ STM-16, or a mix of sixteen STS-12/STM-4 and STS-3/ STM-1 signals in serial 2.5 Gbit/s or serial 622 Mbit/s or serial 155 Mbit/s format. Tethys™ 448 locates the incoming SONET/SDH frame, optionally de-scrambles the data, monitors the TOH and POH, and provides STS-1 level pointer processing. In addition, Tethys™ 448 supports TOH and POH overhead transparency.

APPLICATIONS
• ADM
• Metro Aggregation
• Digital Cross Connects
• Repeaters
• DWDM Equipment
• Test Equipment