MH89770 Datasheet, PDF (1/36 Pages) Mitel Networks Corporation – T1/ESF Framer & Interface Preliminary Information

MH89770
®
T1/ESF Framer & Interface
Preliminary Information
Features
• Complete interface to a bidirectional T1 link
• D3/D4 or ESF framing and SLC-96 compatible
• Two frame elastic buffer with jitter tolerance
improved to 156UI
• Insertion and detection of A, B, C, D bits
Signalling freeze, optional debounce
• Selectable B8ZS, jammed bit (ZCS) or no zero
code suppression
• Yellow and blue alarm signal capabilities
• Bipolar violation count, F_T error count, CRC
error count
• Frame and superframe sync. signals, Tx and Rx
• Per channel, overall, and remote loop around
• 8 kHz synchronization output
• Digital phase detector between T1 line and
ST-BUS
• ST-BUS compatible
• Pin compatible with the MH89760BN/BS
• Inductorless clock recovery
• Loss of Signal (LOS) indication
• Available in standard, narrow and surface
mount formats
MH89770N
MH89770S
ISSUE 2
March 1995
Ordering Information
40 Pin DIL Hybrid 0.8" row pitch
40 Pin Surface Mount Hybrid
0°C to 70°C
Applications
• DS1/ESF digital trunk interfaces
• Computer to PBX interfaces (DMI and CPI)
• High speed computer to computer data links
Description
The MH89770 is a complete T1 interface solution,
meeting the Extended Super Frame (ESF), D3/D4
and SLC-96 formats. The MH89770 interfaces to the
DS1 1.544 Mbit/sec digital trunk and has the
capability of meeting ACCUNET^®1 T1.5 wander
tolerance (138 UI).
The MH89770 is a pin-compatible enhancement of
the MH89760B.
1. ACCUNET^® T1.5 is a registered trademark of AT & T.
TxSF
C2i
F0i
RxSF
DSTo
DSTi
CSTi0
CSTi1
CSTo
ST-BUS
Timing
Circuitry
Data
Interface
Serial
Control
Interface
VDD
XCtl
XSt
Control
Logic
Two Frame
Elastic
Buffer with
Slip Control
2048 - 1544
Converter
DS1
LINK
INTERFACE
Transmitter
Receiver
ABCD
Signalling RAM
Phase
Detector
Clock
Extractor
DS1
Counter
Figure 1 - Functional Block Diagram
C1.5i
RxFDLClk
RxFDL
TxFDLClk
TxFDL
OUTA
OUTB
RxA
RxT
LOS
RxR
RxB
E1.5o
E8Ko
VSS
4-125