MT8979 Datasheet, PDF (1/26 Pages) Mitel Networks Corporation – ISO-CMOS ST-BUS™ FAMILY CEPT PCM 30/CRC-4 Framer & Interface

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 µsec 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 for ADI
codecs
• Per channel, overall and remote loop around
• ST-BUS compatible
Applications
• Primary rate ISDN network nodes
• Multiplexing equipment
• Private network: PBX to PBX links
• High speed computer to computer links
ISSUE 7
May 1995
Ordering Information
MT8979AC 28 Pin Ceramic DIP
MT8979AE 28 Pin Plastic DIP
MT8979AP 44 Pin PLCC
-40° to 85°C
Description
The MT8979 is a single chip CEPT digital trunk
transceiver that meets the requirements of CCITT
Recommendation G.704 for digital multiplex
equipment.
The MT8979 is fabricated in Mitel’s low power
ISO-CMOS technology.
TxMF
C2i
F0i
RxMF
DSTi
DSTo
ADI
CSTi0
CSTi1
CSTo
XCtl
XSt
ST-BUS
Timing
Circuitry
PCM/Data
Interface
Digital
Attenuator
ROM
2 Frame
Elastic Buffer
with Slip
Control
CEPT
Link
Interface
Remote
&
Digital
Loop-
backs
Serial
Control
Interface
Control Logic
ABCD Bit RAM
Phase
Detector
CEPT
Counter
Figure 1 - Functional Block Diagram
V_DD
RxD
RxA
RxB
TxA
TxB
E2i
E8Ko
V_SS
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