Description
The MT9042B Multitrunk System Synchronizer contains a digital phase-locked loop (DPLL), which provides timing and synchronization signals for multitrunk T1 and E1 primary rate transmission links. The MT9042B generates ST-BUS clock and framing signals that are phase locked to either a 2.048MHz, 1.544MHz, or 8kHz input reference.

FEATUREs
• Meets jitter requirements for AT&T TR62411 Stratum 3, 4 and Stratum 4 Enhanced for DS1 interfaces and for ETSI ETS 300 011 for E1 interfaces
• Provides C1.5, C3, C2, C4, C8 and C16 output clock signals
• Provides 8kHz ST-BUS framing signals
• Selectable 1.544MHz, 2.048MHz or 8kHz input reference signals
• Accepts reference inputs from two independent sources
• Provides bit error free reference switching -meets phase slope and MTIE requirements
• Operates in either Normal, Holdover and Freerun modes

APPLICATIONs
• Synchronization and timing control for multitrunk T1 and E1 systems
• ST-BUS clock and frame pulse sources
• Primary Trunk Rate Converters