XRT91L80 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT91L80' PDF : 45 Pages View PDF
XRT91L80
PRELIMINARY
2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER
xr
REV. P1.1.0
4.4.3 Jitter Generation
Jitter generation is defined as the amount of jitter at the STS-N output in the absence of applied input jitter. The
Bellcore and ITU requirement for this type jitter is 0.01UI rms measured with a specific band-pass filter.
FIGURE 22. 91L80 MEASURED ELECTRICAL PHASE NOISE TRANSMIT JITTER GENERATION AT 2.488 GBPS
Wide-band filter used in this test case.
-8 5
-9 0
-9 5
-1 0 0
-1 0 5
-1 1 0
-1 1 5
-1 2 0
-1 2 5
-1 3 0
-1 3 5
1
P h a se N o ise T ra n sm it J itte r G e n e ra tio n
(W id e B a n d ) u sin g H P 8 5 6 0 E
10
100
1000
10000
F re q u e n c y (k H z )
R E F C LK = 155.52 M H z
R E F C LK = 77.76 M H z
100000
FIGURE 23. 91L80 MEASURED ELECTRICAL PHASE NOISE RECEIVE JITTER GENERATION AT 2.488 GBPS
Wide-band filter used in this test case.
-8 5
-9 0
-9 5
-1 0 0
-1 0 5
-1 1 0
-1 1 5
-1 2 0
-1 2 5
-1 3 0
-1 3 5
1
P h a se N o ise R e ce iv e J itte r G e n e ra tio n
(W id e B a n d ) u sin g H P 8 5 6 0 E
10
100
1000
10000
F re q u e n cy (kH z )
RE F CLK = 155.52 M Hz
RE FCLK = 77.76 M Hz
100000
For more information on these specifications refer to Bellcore TR-NWT-000253 sections 5.6.2-5 and GR-253-
CORE section 5.6.
28
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