XRT71D00(2000) Просмотр технического описания (PDF) - Exar Corporation
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XRT71D00 Datasheet PDF : 18 Pages
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XRT71D00
E3/DS3/STS-1 JITTER ATTENUATOR,STS-1 TO DS3 DESYNCHRONIZER
JULY 2000
REV. 1.01
GENERAL DESCRIPTION
The XRT71D00 is a single channel, single chip Jitter
Attenuator, that meets the Jitter requirements speci-
fied in the ETSI TBR-24, Bellcore GR-499 and GR-
253 standards.
In addition, the XRT71D00 also meets the Jitter and
Wander specifications described in the ANSI
T1.105.03b 1997, Bellcore GR-253 and GR-499 stan-
dards for Desynchronizing and Pointer adjustments in
the DS3 to STS-SPE mapping applications.
FEATURES
• Meets the E3/DS3/STS-1 jitter requirements
• No external components required
• Compliance with jitter transfer template outlined in
ITU G.751, G.752, G.755 and GR-499-CORE,1995
standards
• Meets output jitter requirement as specified by
ETSI TBR24
• Meets the Jitter and Wander specifications
described in T1.105.03b,GR-253 and GR-499 stan-
dards.
• Selectable buffer size of 16 and 32 bits
• Jitter attenuator can be disabled
• Available in a 32 pin TQFP package.
• Single 3.3V or 5.0V supply.
• Operates over - 400 C to 850 C temperature range.
APPLICATIONS
• E3/DS3 Access Equipment.
• STS-SPE to DS3 Mapper
• DSLAMs
BLOCK DIAGRAM OF THE XRT71D00
BWS
IC T
DJA
RC lk
C lk E S
RPOS
RNEG
Tim ing C ontrol B lock /
Phase locked Loop
W rite Clock
Read Clock
16/32 Bit FIFO
M Clk
R R C lk
RRPOS
RRNEG
FL
H O S T /H W
RST
DS3/E3
M icroprocessor Serial
In te rfa c e
CS SDI SDO SClk
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
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