MH89790B Datasheet, PDF (1/32 Pages) Mitel Networks Corporation – ST-BUS™ FAMILY CEPT PCM 30/CRC-4 Framer & Interface Preliminary Information

ST-BUS™ FAMILY MH89790B
®
CEPT PCM 30/CRC-4 Framer & Interface
Preliminary Information
Features
• Complete primary rate 2048 kbit/s CEPT
transceiver with CRC-4 option
• Selectable HDB3 or AMI line code
• Two frame elastic buffer with 32µs jitter buffer
• Tx and Rx frame and multiframe
synchroniza-tion signals
• Frame alignment and CRC error counters
• Insertion and detection of A, B, C, D signalling
bits with optional debounce
• Line driver and receiver
• Per channel, overall, and remote loop around
• Digital phase detector between E1 line and
ST-BUS
• ST-BUS compatible
• Pin compatible with the MH89790
• Inductorless clock recovery
• Loss of Signal (LOS) indication
• Available in standard, narrow and surface
mount formats
• Supports single supply rail operation
Applications
• Primary rate ISDN network nodes
• Multiplexing equipment
• Private network: PBX to PBX links
ISSUE 5
May 1995
MH89790B
MH89790BN
MH89790BS
Ordering Information
40 Pin DIL Hybrid 1.3” row pitch
40 Pin DIL Hybrid 0.8“ row pitch
40 Pin Surface Mount Hybrid
0°C to 70°C
Description
The MH89790B is Mitel’s CEPT PCM 30 interface
solution, designed to meet the latest CCITT
standards PCM 30 format with CRC-4. The
MH89790B provides a complete interface between a
2.048 Mbit/sec digital trunk and Mitel’s Serial
Telecom Bus, the ST-BUS.
The MH89790B is a pin-compatible enhancement of
the MH89790, permitting the removal of the tuneable
inductor and inclusion of the external NAND gate
used for generating RxD.
TxMF
C2i
F0i
RxMF
DSTo
DSTi
CSTi0
CSTi1
CSTo
VDD
ADl
XCtl
XSt
ST-BUS
Timing
Cicuitry
Data
Interface
Digital
Attenu-
ator
ROM
2 Frame
Elastic
Buffer
with Slip
Control
Serial
Control
Interface
Control
Logic
ABCD
Signalling RAM
CEPT
Link
Interface
Transmitter
•
Receiver
•
Phase
Detector
•
Clock
•
Extractor
CEPT
•
Counter
Figure 1 - Functional Block Diagram
PADi
TxG
PADo
OUTA
OUTB
RxA
RxT
LOS
RxR
RxB
E2o
E8Ko
VSS
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