MT90710 Datasheet, PDF (1/12 Pages) Mitel Networks Corporation – High-Speed Isochronous Multiplexer

CMOS
MT90710
®
High-Speed Isochronous Multiplexer
Preliminary Information
Features
• Multiplexes eight 2.048 Mbit/s, ST-BUS links
onto one serial high-speed 20.48 Mbit/s link
• 15.808 Mbit/s clear bandwidth transport
• Two 8 kbit/s and one 32 kbit/s oversampled
signalling channels
• Embedded system timing and frame
synchronization
• Frame buffer control signals generated on-chip
• Check-sum generated on multiplexed frame
• Remote synchronization indication
• Both master and slave timing mode operation
• On-chip reference generation for slave mode
synchronization
• 4B/5B data encoding/decoding
Applications
• Fibre distributed sytems
• Backplane concentrators
• Local Area Networks (LANs)
ISSUE 1
January 1995
Ordering Information
MT90710AP
84 Pin PLCC
0 °C to +70 °C
Description
The High-Speed Isochronous Multiplexer integrated
circuit multiplexes up to eight Serial Telecom
(ST-BUS) links onto a single 20 MHz loop to facilitate
point-to-point data transport requirements. The
MT90710 connects easily with standard Fiber Optic
interfaces to form a complete electric to photonic
conversion circuit. Optical transmission allows large
bandwidth inter-shelf or, in distributed systems,
inter-node communication by eliminating multiple
data buses, cable inter-connect and attendant driver
interfaces. The final result is a simple physical
interface free of the radiated emissions and
background noise susceptibility problems
encountered in copper-wired environments.
STi0
STi5
STi6A
STi6B
STi7
DIN8K0
DIN8K1
DIN32K
STo0
STo5
STo6A
STo6B
STo7
DOUT8K0
DOUT8K1
DOUT32K
MUX
DEMUX
TRANSMIT
Overhead
Checksum
Frame Sync
4B/5B &
NRZI
Encode
RECEIVE
Overhead
Extract &
Insert
Error Check
Frame Alignment & Buffer
External Memory Control
To Transmit Driver
Amplifier and Fiber
Driver Transducer
Control
NRZI Decode
Sync Detect
4B/5B Decode
From Receive Pin Diode,
Pre-amp and Post-amp
Circuits
Signals to
External PLL
TxDATA
MODE0
MODE1
MODE2
F0b
C4b
E20i
RLED
LLED
C20o
POR
RESET
C4REFo
C4o
C40i
Figure 1 - Functional Block Diagram
5-3