XRT75R06D Datasheet, PDF (1/105 Pages) Exar Corporation – SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

áç
XRT75R06D
SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
DECEMBER 2004
GENERAL DESCRIPTION
The XRT75R06D is a six channel fully integrated Line
Interface Unit (LIU) featuring EXAR’s R³ Technology
(Reconfigurable, Relayless, Redundancy) for E3/
DS3/STS-1 applications. The LIU incorporates 6
independent Receivers, Transmitters and Jitter
Attenuators in a single 217 Lead BGA package.
Each channel of the XRT75R06D 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 XRT75R06D’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 XRT75R06D incorporates an advanced crystal-
less jitter attenuator per channel that can be selected
either in the transmit or receive path. The jitter
attenuator performance meets the ETSI TBR-24 and
REV. 1.0.0
Bellcore GR-499 specifications. Also, the jitter
attenuators can be used for clock smoothing in
SONET STS-1 to DS-3 de-mapping.
The XRT75R06D provides a Parallel Microprocessor
Interface for programming and control.
The XRT75R06D 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 75R06D
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
XRT75R06D
XRT75R06D
Peak Detector
AGC/
Equalizer
Slicer
Local
LoopBack
Clock & Data
Recovery
LOS
Detector
Clock
Synthesizer
Jitter
MUX
Attenuator
Remote
LoopBack
HDB3/
B3ZS
Decoder
Line
Driver
Device
Monitor
Tx
Pulse
Shaping
Tx
Control
Timing
Control
Jitter
Attenuator
MUX
HDB3/
B3ZS
Encoder
Channel 0
Channel n...
Channel 5
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
XRT75R06DIB
ORDERING INFORMATION
PACKAGE
217 Lead BGA
OPERATING TEMPERATURE RANGE
-40^°C to +85^°C
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com