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MT8977

Part Number	MT8977
Manufacturer	Mitel Networks Corporation
Description	ISO-CMOS ST-BUS FAMILY T1/ESF Framer Circuit
Published	Sep 11, 2005
Detailed Description	® ISO-CMOS ST-BUS™ FAMILY MT8977 ® T1/ESF Framer Circuit (ACCUNET T1.5) Preliminary Information Features • • • • • • •...
Datasheet	MT8977 PDF File

Overview

® ISO-CMOS ST-BUS™ FAMILY MT8977 ® T1/ESF Framer Circuit (ACCUNET T1.
5) Preliminary Information Features • • • • • • • • • • • • • • D3/D4 or ESF framing and SLC-96 compatible Two frame elastic buffer with jitter tolerance improved to 156 UI 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 and STBUS One uncommitted scan point and drive point Pin compatible with MT8976 and MT8979 ST-BUS compatible ISSUE 2 May 1995 Ordering Information MT8977AC 28 Pin Ceramic DIP MT8977AE 28 Pin Plastic DIP MT8977AP 44 Pin PLCC -40°C to 85° C Description The MT8977 is a variant of the MT8976 framer, which has been enhanced to meet ACCUNET® T1.
5 wander tolerance (138 UI).
The MT8977 meets ESF and D3/D4 formats, and is compatible with SLC-96 systems.
Applications • • • DS1/ESF digital trunk interfaces Computer to PBX interfaces (DMI and CPI) High speed computer to computer data links TxSF C2i F0i RxSF DSTo DSTi C1.
5i ST-BUS Timing Circuitry 2 Frame Elastic Buffer with Slip Control DS1 Link Interface 2048-1544 Converter RxFDLClk RxFDL RxA Remote & Digital Loopbacks RxB TxA TxB TxFDLClk TxFDL RxD Serial Control Interface ABCD Signalling RAM E1.
5i Phase Detector DS1 Counter Data Interface CSTi0 CSTi1 CSTo XCtl XSt Control Logic • E8Ko VSS VDD ACCUNET ® T1.
5 is a registered trademark of AT & T Figure 1 - Functional Block Diagram 4-99 MT8977 ISO-CMOS Preliminary Information TxA TxB DSTo NC VSS VDD IC NC F0i NC E1.
5i 28 PIN CERDIP/PDIP Figure 2 - Pin Connections Pin Description Pin # DIP PLCC Name TxA TxB DSTo NC RxA Description Transmit A Output.
Unipolar output that can be used in conj...

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