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APRIL 2005
XRT83SL28
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
GENERAL DESCRIPTION
The XRT83SL28 is a fully integrated 8-channel E1
short-haul LIU which optimizes system cost and
performance by offering key design features. The
XRT83SL28 operates from a single 3.3V power
supply. The LIU features are programmed through a
standard serial microprocessor interface or hardware
control. EXAR’s LIU has patented high impedance
circuits that allow the transmitter outputs and receiver
inputs to be high impedance when experiencing a
power failure or when the LIU is powered off. Key
design features within the LIU optimize 1:1 or 1+1
redundancy and non-intrusive monitoring applications
to ensure reliability without using relays.
Additional features include TAOS for transmit and
receive, RLOS, LCV, AIS, DMO, and diagnostic
loopback modes.
APPLICATIONS
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ISDN Primary Rate Interface
CSU/DSU E1 Interface
E1 LAN/WAN Routers
Public Switching Systems and PBX Interfaces
E1 Multiplexer and Channel Banks
Integrated Multi-Service Access Platforms (IMAPs)
Integrated Access Devices (IADs)
Inverse Multiplexing for ATM (IMA) Wireless Base
Stations
F
IGURE
1. H
OST
M
ODE
B
LOCK
D
IAGRAM OF THE
XRT83SL28
1 of 8 Channels
Driver
Monitor
DMO
TCLK
TPOS
TNEG
HDB3
Encoder
Timing
Control
Tx Pulse
Shaper
Line
Driver
TTIP
TRING
Analog
Loopback
Remote
Loopback
Jitter
Attenuator
(Rx or Tx)
Digital
Loopback
RCLK
RPOS
RNEG/LCV
HDB3
Decoder
Clock & Data
Recovery
Peak
Detector
& Slicer
Rx
Equalizer
RTIP
RRING
RLOS
AIS & LOS
Detector
ICT
Test
Serial Microprocessor
Interface
Clock Distribution
TxOE
HW/Host
Reset
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
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(510) 668-7000
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FAX (510) 668-7017
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www.exar.com
MCLK
SCLK
SDO
INT
SDI
CS
EXAR [ EXAR CORPORATION ]
