XRT83SL314_05 Datasheet, PDF (1/83 Pages) Exar Corporation – 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

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XRT83SL314
MARCH 2005
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.1
GENERAL DESCRIPTION
The XRT83SL314 is a fully integrated 14-channel
short-haul line interface unit (LIU) that operates from
a single 3.3V power supply. Using internal
termination, the LIU provides one bill of materials to
operate in T1, E1, or J1 mode independently on a per
channel basis with minimum external components.
The LIU features are programmed through a standard
microprocessor interface. 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.
The on-chip clock synthesizer generates T1/E1/J1
clock rates from a selectable external clock frequency
and has five output clock references that can be used
for external timing (8kHz, 1.544Mhz, 2.048Mhz,
nxT1/J1, nxE1).
Additional features include RLOS, a 16-bit LCV
counter for each channel, AIS, QRSS generation/
detection, Network Loop Code generation/detection,
TAOS, DMO, and diagnostic loopback modes.
APPLICATIONS
• T1 Digital Cross Connects (DSX-1)
• ISDN Primary Rate Interface
• CSU/DSU E1/T1/J1 Interface
• T1/E1/J1 LAN/WAN Routers
• Public Switching Systems and PBX Interfaces
• T1/E1/J1 Multiplexer and Channel Banks
• Integrated Multi-Service Access Platforms (IMAPs)
• Integrated Access Devices (IADs)
• Inverse Multiplexing for ATM (IMA)
• Wireless Base Stations
FIGURE 1. BLOCK DIAGRAM OF THE XRT83SL314
TCLK
TPOS
TNEG
RCLK
RPOS
RNEG
ICT
TEST
TxON
1 of 14 Channels
NLCD
Generation
Driver
Monitor
HDB3/B8ZS
Encoder
Tx Jitter
Attenuator
Timing
Control
Tx Pulse
Shaper &
Pattern Gen
Remote
Loopback
Digital
Loopback
QRSS
Generation
& Detection
Line
Driver
Analog
Loopback
HDB3/B8ZS
Decoder
Rx Jitter
Attenuator
Clock & Data
Recovery
NLCD
Detection
AIS & LOS
Detector
Peak
Detector
& Slicer
Rx
Equalizer
Rx Equalizer
Control
Test
Microprocessor
Interface
Programmable Master
Clock Synthesizer
TTIP
TRING
RTIP
RRING
DMO
RLOS
8kHzOUT
MCLKE1out
MCLKT1out
MCLKE1Nout
MCLKT1Nout
RxON
RxTSEL
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com