Description
The MT90737 DS3/DS1 Multiplexer/Demultiplexer (M13) is designed to multiplex and demultiplex 28 independent DS1 signals to and from a DS3 signal with either an M13 or C-bit frame format. The MT90737 complies with Bellcore’s TR-TSY-000499, ANSI’s T1.107-1988 and supplement T1.107a-1990.

FEATUREs
• Multiplexes/demultiplexes 28 DS1 signals to/from a DS3 signal
• Selectable M13 or C-bit parity mode
• Separate interface for C-bits
• FEBE, C or P-bit parity error insertion
• DS3 LOS, LOF, P-bit parity, C-bit parity, AIS and idle signal detection
• DS3 AIS and idle signal generation
• Access to DS3 and DS2 X-bits
• DS3 and DS1 loopbacks
• Detects DS2 LOF
• DS1 idle signal (QRS, AIS or ESF) generation
• DS1 LOS detection on transmit or receive path
• Multiplexed and non-multiplexed microprocessor bus interfaces

APPLICATIONs
• Single-board M13 multiplexer
• Compact add/drop mux
• Fractional T3
• Digital Cross-connect Systems
• CSU/DSU