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XRT83SL28
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
APRIL 2005
REV. 1.0.0
Additional features include TAOS for transmit and
receive, RLOS, LCV, AIS, DMO, and diagnostic
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.
loopback modes.
APPLICATIONS
• 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
FIGURE 1. HOST MODE BLOCK DIAGRAM OF THE XRT83SL28
1 of 8 Channels
Driver
DMO
Monitor
TTIP
TCLK
TPOS
TNEG
HDB3
Encoder
Timing
Control
Tx Pulse
Shaper
Line
Driver
TRING
Remote
Loopback
Analog
Loopback
Digital
Loopback
Jitter
Attenuator
(Rx or Tx)
RTIP
Peak
Detector
& Slicer
RCLK
HDB3
Decoder
Clock & Data
Recovery
Rx
Equalizer
RPOS
RNEG/LCV
RRING
RLOS
AIS & LOS
Detector
Test
ICT
Clock Distribution
Serial Microprocessor
Interface
TxOE
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
EXAR [ EXAR CORPORATION ]
