Description
The MT8976 is Mitel’s second generation T1 interface solution. The MT8976 meets the Extended Super Frame format (ESF), the current D3/D4 format and is compatible with SLC-96 systems.
The MT8976 interfaces to DS1 1.544 Mbit/sec digital trunk.

Features
• D3/D4 or ESF framing and SLC-96 compatible
• 2 frame elastic buffer with 32 µsec jitter buffer
• Insertion and detection of A, B,C,D bits. Signalling freeze, optional debounce
• Selectable B8ZS, jammed bit (ZCS) or no zero code suppression
• Yellow alarm and blue alarm signal capabilities
• Bipolar violation count, FT error count, CRC error count
• Selectable robbed bit signalling
• Frame and superframe sync. signals, Tx and Rx
• AMI encoding and decoding
• Per channel, overall, and remote loop around
• Digital phase detector between T1 line & STBUS
• One uncommitted scan point and drive point
• Pin compatible with MT8977 and MT8979
• ST-BUS compatible

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