XRT83SH314_0610 Datasheet, PDF (1/101 Pages) Exar Corporation – 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

XRT83SH314
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
OCTOBER 2006
REV. 1.0.4
GENERAL DESCRIPTION
The XRT83SH314 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/PRBS
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 XRT83SH314
TCLK_n
TPOS_n
TNEG_n
TxON
RPOS_n
RCLK_n
RNEG_n
ICT
TEST
ATP_TIP
ATP_RING
1 of 14 Channels
Driver
Monitor
HDB3/B8ZS
Encoder
Tx/Rx Jitter
Attenuator
Timing
Control
Tx Pulse
Shaper &
Pattern Gen
Remote
Loopback
Digital
Loopback
QRSS
Generation
& Detection
Line
Driver
Analog
Loopback
HDB3/B8ZS
Decoder
Tx/Rx Jitter
Attenuator
Clock & Data
Recovery
Peak
Detector
& Slicer
AIS & LOS
Detector
Test
Microprocessor
Interface
Programmable Master
Clock Synthesizer
DMO
TTIP_n
TRING_n
RTIP_n
RRING_n
RLOS
RCLKOUT
RxON
RxTSEL
8kHzOUT
MCLKE1out
MCLKT1out
MCLKE1Nout
MCLKT1Nout
FEATURES
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com