xrt91l31 Exar Corporation, xrt91l31 Datasheet - Page 36

• Manufacturer Part Number: xrt91l31
• Description: Sts-12/stm-4 Or Sts-3/stm-1 Sonet/sdh Transceiver
• Manufacturer: Exar Corporation

XRT91L31
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
The jitter transfer function is a ratio between the jitter output and jitter input for a component, or system often
expressed in dB. A negative dB jitter transfer indicates the element removed jitter. A positive dB jitter transfer
indicates the element added jitter. A zero dB jitter transfer indicates the element had no effect on jitter.
The jitter attenuator within the XRT91L31 meets the latest jitter attenuation specifications and/or jitter transfer
characteristics as shown in the
F
F
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.
BellCore GR-253 and ITUT G.783 versus XRT91L31 typical jitter performance.
4.6.3
IGURE
IGURE
26. J
27. J
Jitter Generation
ITTER
ITTER
T
T
RANSFER
RANSFER
-10
-15
-20
-25
-10
-15
-20
-25
-5
-5
5
0
1E+02
5
0
1E+02
F
F
OR
OR
Figure 26
Jitter Transfer, OC-3 (Low Bandwidth)
Jitter Transfer, OC12 (Low Bandwidth)
OC-12
OC-3
1E+03
1E+03
Mask
and
Mask
Figure
1E+04
1E+04
Frequency (Hz)
Frequency (Hz)
36
27.
Table 19
1E+05
1E+05
below shows the jitter generation limits per
Jitter Transfer
Jitter Transfer
1E+06
1E+06
1E+07
1E+07
REV. 1.0.0