XRT83SL30 Datasheet, PDF (1/76 Pages) Exar Corporation – SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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PRELIMINARY
XRT83SL30
SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
MAY 2003
REV. P1.0.4
GENERAL DESCRIPTION
The XRT83SL30 is a fully integrated single-channel
short-haul line interface unit for T1(1.544Mbps) 100Ω,
E1(2.048Mbps) 75Ω or 120Ω and J1 110Ω applica-
tions.
In T1 applications, the XRT83SL30 can generate five
transmit pulse shapes to meet the short-haul Digital
Cross-Connect (DSX-1) template requirements.
The XRT83SL30 provides both Serial Host micropro-
cessor interface and Hardware Mode for program-
ming and control. Both B8ZS and HDB3 encoding
and decoding functions are included and can be dis-
abled as required. On-chip crystal-less jitter attenua-
tor with a 32 or 64 bit FIFO can be placed either in the
receive or the transmit path with loop bandwidths of
less than 3Hz. The XRT83SL30 provides a variety of
loop-back and diagnostic features as well as transmit
driver short circuit detection and receive loss of signal
monitoring. It supports internal impedance matching
for 75Ω, 100Ω, 110Ω and 120Ω for both transmitter
and receiver. For the receiver this is accomplished
with internal resistors or through the combination of
one single fixed value external resistor and program-
mable internal resistors. In the absence of the power
supply, the transmit output and receive input are tri-
stated allowing for redundancy applications. The chip
includes an integrated programmable clock multiplier
that can synthesize T1 or E1 master clocks from a va-
riety of external clock sources.
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
FEATURES
(See Page 2)
FIGURE 1. BLOCK DIAGRAM OF THE XRT83SL30 T1/E1/J1 LIU (HOST MODE)
MCLKE1
MCLKT1
TPOS / TDATA
TNEG / CODES
TCLK
QRPD
RCLK
RNEG / LCV
RPOS / RDATA
NLCD
RLOS
HW/HOST
CS
INT
MASTER CLOCK SYNTHESIZER
QRSS
PATTERN
GENERATOR
QRSS ENABLE
QRSS
DETECTOR
NETWORK
LOOP
DETECTOR
HDB3/
B8ZS
ENCODER
TAOS
ENABLE
TX/RX JITTER
ATTENUATOR
TIMING
CONTROL
TX FILTER
& PULSE
SHAPER
DRIVE
MONITOR
LINE
DRIVER
REMOTE
LOOPBACK
DIGITAL
LOOPBACK
LOOPBACK
ENABLE
HDB3/
B8ZS
DECODER
TX/RX JITTER
ATTENUATOR
TIMING &
DATA
RECOVERY
LBO[3:0]
PEAK
DETECTOR
& SLICER
LOCAL
ANALOG
LOOPBACK
RX
EQUALIZER
NLCD ENABLE
LOS
DETECTOR
AIS
DETECTOR
EQUALIZER
CONTROL
Serial Interface
TEST
MCLKOUT
DMO
TTIP
TRING
TXON
RTIP
RRING
AISD
ICT
SDO
SCLK
SDI
RESET
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com