Description
The MH89770 is a complete T1 interface solution, meeting the Extended Super Frame (ESF), D3/D4 and SLC-96 formats. The MH89770 interfaces to the DS1 1.544 Mbit/sec digital trunk and has the capability of meeting ACCUNET®1 T1.5 wander tolerance (138 UI).

FEATUREs
• Complete interface to a bidirectional T1 link
• D3/D4 or ESF framing and SLC-96 compatible
• Two frame elastic buffer with jitter tolerance improved to 156UI
• Insertion and detection of A, B, C, D bits Signalling freeze, optional debounce
• Selectable B8ZS, jammed bit (ZCS) or no zero code suppression
• Yellow and blue alarm signal capabilities
• Bipolar violation count, FT error count, CRC error count
• Frame and superframe sync. signals, Tx and Rx
• Per channel, overall, and remote loop around
• 8 kHz synchronization output
• Digital phase detector between T1 line and ST-BUS
• ST-BUS compatible
• Pin compatible with the MH89760BN/BS
• Inductorless clock recovery
• Loss of Signal (LOS) indication
• Available in standard, narrow and surface mount formats

APPLICATIONs
• DS1/ESF digital trunk interfaces
• Computer to PBX interfaces (DMI and CPI)
• High speed computer to computer data links