XRT83L314 Datasheet, PDF (1/84 Pages) Exar Corporation – 14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT

XRT83L314
MAY 2004
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
GENERAL DESCRIPTION
The XRT83L314 is a fully integrated 14-channel long-
haul and 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 XRT83L314
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