XRT83VSH38 Datasheet, PDF (1/76 Pages) Exar Corporation – 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

XRT83VSH38
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
MARCH 2007
REV. 1.0.7
GENERAL DESCRIPTION
The XRT83VSH38 is a fully integrated 8-channel
short-haul line interface unit (LIU) that operates from
a 1.8V and a 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 parallel or serial 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 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 XRT83VSH38 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