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XRT91L30 View Datasheet(PDF) - Exar Corporation

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XRT91L30 Datasheet PDF : 39 Pages
First Prev 31 32 33 34 35 36 37 38 39
XRT91L30
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
xr
REV. 1.0.1
FIGURE 25. XRT91L30 MEASURED JITTER TOLERANCE WITH 19.44MHZ REFERENCE CLOCK
STS-3/STM-1
STS-12/STM-4
4.6.2 Jitter Generation
Jitter generation is defined as the amount of jitter at the STS-N output in the absence of applied input jitter. The
bandwidth is set according to the data rate. The Bellcore and ITU requirement for this type jitter is 0.01UI rms
measured with a specific band-pass filter.
For more information on these specifications refer to Bellcore TR-NWT-000253 sections 5.6.2-5 and GR-253-
CORE section 5.6 and ITUT G.783 section 9.3.1.1. Table 17 below shows the jitter generation limits per
BellCore GR-253 and ITUT G.783 versus XRT91L30 typical jitter performance.
TABLE 17: XRT91L30 OPTICAL JITTER GENERATION USING 223-1 PRBS PATTERN
INTERFACE
MEASUREMENT BAND FILTER
-3dB FREQUENCIES
HIGH PASS LOW PASS
GR-253/
G.783
MAXIMUM
PERMISSIBLE
LIMIT
XRT91L30 INTRINSIC JITTER
(TRANSMIT PARALLEL CLOCK
INPUT DIRECTION)
19.44 MHZ
REF CLOCK
77.76 MHZ
REF CLOCK
XRT91L30 INTRINSIC JITTER
(TRANSMIT PARALLEL CLOCK
OUTPUT DIRECTION)
19.44 MHZ
REF CLOCK
77.76 MHZ
REF CLOCK
OPTICAL
(KHZ)
(MHZ)
mUI rms
mUI rms
mUI rms
mUI rms
mUI rms
OC3/STM1
12
1.3
10
2
1
2
OC12/STM4
12
5
10
7
8
7
TABLE 18: XRT91L30 OPTICAL JITTER GENERATION USING 223-1 PRBS PATTERN USING ALTERNATE STANDARD
FILTERS
INTERFACE
MEASUREMENT BAND FILTER
-3dB FREQUENCIES
HIGH PASS LOW PASS
XRT91L30 INTRINSIC JITTER
(TRANSMIT PARALLEL CLOCK
INPUT DIRECTION)
XRT91L30 INTRINSIC JITTER
(TRANSMIT PARALLEL CLOCK
OUTPUT DIRECTION)
19.44 MHZ
REF CLOCK
77.76 MHZ
REF CLOCK
19.44 MHZ
REF CLOCK
77.76 MHZ
REF CLOCK
OPTICAL
(KHZ)
(MHZ)
mUI rms
mUI rms
mUI rms
mUI rms
OC3/STM1
65
1.3
2
1
2
OC12/STM4
250a
5
4
5
4
a. According to ITU-T G.783
32
 

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