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MT8977 Datasheet

Part Number MT8977
Manufacturers Mitel Networks Corporation
Logo Mitel Networks Corporation
Description ISO-CMOS ST-BUS FAMILY T1/ESF Framer Circuit
Datasheet MT8977 DatasheetMT8977 Datasheet (PDF)

® 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 Selectab.

  MT8977   MT8977






Part Number MT8979
Manufacturers Mitel Networks Corporation
Logo Mitel Networks Corporation
Description ISO-CMOS ST-BUS FAMILY CEPT PCM 30/CRC-4 Framer & Interface
Datasheet MT8977 DatasheetMT8979 Datasheet (PDF)

® ISO-CMOS ST-BUS™ FAMILY MT8979 CEPT PCM 30/CRC-4 Framer & Interface Features • • • • • • • • • • Single chip primary rate 2048 kbit/s CEPT transceiver with CRC-4 option Meets CCITT Recommendation G.704 Selectable HDB3 or AMI line code Tx and Rx frame and multiframe synchronization signals Two frame elastic buffer with 32 µ sec jitter buffer Frame alignment and CRC error counters Insertion and detection of A, B, C, D signalling bits with optional debounce On-chip attenuation ROM with option f.

  MT8977   MT8977







Part Number MT8976
Manufacturers Mitel Networks Corporation
Logo Mitel Networks Corporation
Description ISO-CMOS ST-BUS FAMILY T1/ESF Framer Circuit
Datasheet MT8977 DatasheetMT8976 Datasheet (PDF)

® ISO-CMOS ST-BUS™ FAMILY MT8976 T1/ESF Framer Circuit Features • • • • • • • • • • • • • • D3/D4 or ESF framing and SLC-96 compatible 2 frame elastic buffer with 32 µ sec 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. signal.

  MT8977   MT8977







Part Number MT8972B
Manufacturers Mitel Networks Corporation
Logo Mitel Networks Corporation
Description (MT8971B) ISO2-CMOS ST-BUS FAMILY Digital Subscriber Interface Circuit Digital Network Interface Circuit
Datasheet MT8977 DatasheetMT8972B Datasheet (PDF)

® ISO2-CMOS ST-BUS™ FAMILY MT8971B/72B Digital Subscriber Interface Circuit Digital Network Interface Circuit Features • • • • • • • • • Full duplex transmission over a single twisted pair Selectable 80 or 160 kbit/s line rate Adaptive echo cancellation Up to 3km (8971B) and 4 km (8972B) ISDN compatible (2B+D) data format Transparent modem capability Frame synchronization and clock extraction MITEL ST-BUS compatible Low power (typically 50 mW), single 5V supply ISSUE 7 May 1995 Ordering Inf.

  MT8977   MT8977







Part Number MT8971B
Manufacturers Mitel Networks Corporation
Logo Mitel Networks Corporation
Description (MT8972B) ISO2-CMOS ST-BUS FAMILY Digital Subscriber Interface Circuit Digital Network Interface Circuit
Datasheet MT8977 DatasheetMT8971B Datasheet (PDF)

® ISO2-CMOS ST-BUS™ FAMILY MT8971B/72B Digital Subscriber Interface Circuit Digital Network Interface Circuit Features • • • • • • • • • Full duplex transmission over a single twisted pair Selectable 80 or 160 kbit/s line rate Adaptive echo cancellation Up to 3km (8971B) and 4 km (8972B) ISDN compatible (2B+D) data format Transparent modem capability Frame synchronization and clock extraction MITEL ST-BUS compatible Low power (typically 50 mW), single 5V supply ISSUE 7 May 1995 Ordering Inf.

  MT8977   MT8977







ISO-CMOS ST-BUS FAMILY T1/ESF Framer Circuit

® 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 Contr.


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