MT8976 Datasheet, PDF (1/26 Pages) Mitel Networks Corporation – ISO-CMOS ST-BUS™ FAMILY T1/ESF Framer Circuit

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 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, F_T 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 & ST-
BUS
• One uncommitted scan point and drive point
• Pin compatible with MT8977 and MT8979
• ST-BUS compatible
ISSUE 9
May 1995
Ordering Information
MT8976AC 28 Pin Ceramic DIP
MT8976AE 28 Pin Plastic DIP
MT8976AP 44 Pin PLCC
-40°C to 85°C
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.
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
CSTi0
CSTi1
CSTo
XCtl
XSt
ST-BUS
Timing
Circuitry
Data
Interface
Serial
Control
Interface
Control Logic
2 Frame
Elastic Buffer
with Slip
Control
2048-1544
Converter
DS1
Link
Interface
Remote &
Digital
Loopbacks
ABCD
Signalling RAM
Phase
DS1
Detector
Counter
•
Figure 1 - Functional Block Diagram
C1.5i
RxFDLClk
RxFDL
RxA
RxB
TxA
TxB
TxFDLClk
TxFDL
RxD
E1.5i
E8Ko
V_SS
V_DD
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