XRT73R12_07 Datasheet, PDF (1/89 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT

XRT73R12
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
JUNE 2007
REV. 1.0.2
GENERAL DESCRIPTION
The XRT73R12 is a twelve channel fully integrated
Line Interface Unit (LIU) featuring EXAR’s R³
Technology (Reconfigurable, Relayless Redundancy)
for E3/DS3/STS-1 applications. The LIU incorporates
12 independent Receivers and Transmitters in a
single 420 Lead TBGA package.
Each channel of the XRT73R12 can be
independently configured to operate in E3 (34.368
MHz), DS3 (44.736 MHz) or STS-1 (51.84 MHz).
Each transmitter can be turned off and tri-stated for
redundancy support or for conserving power.
The XRT73R12’s differential receiver provides high
noise interference margin and is able to receive data
over 1000 feet of cable or with up to 12 dB of cable
attenuation.
The XRT73R12 provides a Parallel Microprocessor
Interface for programming and control.
The XRT73R12 supports analog, remote and digital
loop-backs. The device also has a built-in Pseudo
Random Binary Sequence (PRBS) generator and
detector with the ability to insert and detect single bit
error for diagnostic purposes.
APPLICATIONS
• E3/DS3 Access Equipment
• DSLAMs
• Digital Cross Connect Systems
• CSU/DSU Equipment
• Routers
• Fiber Optic Terminals
FIGURE 1. BLOCK DIAGRAM OF THE XRT 73R12
CS
RD
WR
Addr[7:0]
D[7:0]
PCLK
RDY
INT
Pmode
RESET
RTIP_n
RRing_n
TTIP_n
TRing_n
MTIP_n
MRing_n
DMO_n
ICT
µProcessor Interface
XRT73R12
Peak Detector
AGC/
Equalizer
Slicer
Local
LoopBack
Clock & Data
Recovery
LOS
Detector
Clock
Synthesizer
MUX
Remote
LoopBack
HDB3/
B3ZS
Decoder
Line
Driver
Device
Monitor
Tx
Pulse
Shaping
Tx
Control
Timing
Control
HDB3/
MUX
B3ZS
Encoder
Channel 0
Channel n...
Channel 11
CLKOUT_n
SFM_en
RLOL_n
E3Clk
DS3Clk
STS-Clk/12M
RxClk_n
RxPOS_n
RxNEG/LCV_n
RLOS_n
TxClk_n
TxPOS_n
TxNEG_n
TxON
PART NUMBER
XRT73R12IB
ORDERING INFORMATION
PACKAGE
420 Lead TBGA
OPERATING TEMPERATURE RANGE
-40^°C to +85^°C
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com