MH89760B Datasheet, PDF (1/38 Pages) Mitel Networks Corporation – ST-BUS™ FAMILY T1/ESF Framer & Interface Preliminary Information

ST-BUS™ FAMILY MH89760B
®
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 32µs 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 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 MH89760
• Inductorless clock recovery
• Loss of Signal (LOS) indication
• Available in standard, narrow and surface
mount formats
Applications
• DS1/ESF digital trunk interfaces
• Computer to PBX interfaces (DMI and CPI)
• High speed computer to computer data links
ISSUE 5
May 1995
MH89760B
MH89760BN
MH89760BS
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 MH89760B is a complete T1 interface solution,
meeting the Extended Super Frame (ESF), D3/D4
and SLC-96 formats. The MH89760B interfaces to
the DS11.544 Mbit/sec digital trunk.
The MH89760B is a pin-compatible enhancement of
the MH89760, permitting the removal of the tuneable
inductor and inclusion of the external NAND gate
used for generating RxD.
TxSF
C2i
F0i
RxSF
DSTo
DSTi
CSTi0
CSTi1
CSTo
ST-BUS
Timing
Circuitry
Data
Interface
Serial
Control
Interface
VDD
XCtl
XSt
Control
Logic
1544-2048
Two Frame
Elastic
Buffer
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
4-55