XRT83SH38_0609 Datasheet, PDF (1/78 Pages) Exar Corporation – 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

XRT83SH38
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
SEPTEMBER 2006
REV. 1.0.7
GENERAL DESCRIPTION
The XRT83SH38 is a fully integrated 8-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 with minimum external components.
The LIU features are programmed through a standard
microprocessor interface, serial interface or
controlled through Hardware mode. 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 outputs a clock reference of the line rate chosen.
Additional features include RLOS, a 16-bit LCV
counter for each channel, AIS, QRSS 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
FIGURE 1. BLOCK DIAGRAM OF THE XRT83SH38 T1/E1/J1 LIU (HOST MODE)
MCLKE1
MCLKT1
TPOS_n/TDATA_n
TNEG_n/CODES_n
TCLK_n
RCLK_n
RNEG_n/LCV_n
RPOS_n/RDATA_n
RLOS_n
HW/HOST
WR_R/W
RD_DS
ALE-AS
CS
RDY_DTACK/SDO
INT
SER_PAR
MASTER CLOCK SYNTHESIZER
1 of 8 channels, CHANNEL_n
QRSS
PATTERN
GENERATOR
HDB3/
B8ZS
ENCODER
TX/RX JITTER
ATTENUATOR
TAOS
TIMING
CONTROL
TX FILTER
& PULSE
SHAPER
DRIVE
MONITOR
LINE
DRIVER
QRSS
DETECTOR
Remote
Loopback
Digital
Loopback
Analog
Loopback
HDB3/
B8ZS
DECODER
TX/RX JITTER
ATTENUATOR
TIMING &
DATA
RECOVERY
LOS
DETECTOR
AIS
DETECTOR
PEAK
DETECTOR
& SLICER
TEST
MICROPROCESSOR/SERIAL INTERFACE CONTROLLER
MCLKOUT
DMO_n
TTIP_n
TRING_n
TXON_n
RTIP_n
RRING_n
ICT
µPTS1
µPTS2
D[7:0]
µPCLK/SCLK
A[7:0]/SDI
RESET
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com