CX28331/CX28332/CX28333
2.0 Functional Description
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
2.4 Jitter Tolerance
2.4.1 Jitter Transfer
The receiver must meet certain jitter transfer specifications between the input and
output jitter as a function of frequency. These specifications are only intended to
be met with the use of a jitter attenuator. Because the CX2833i does not contain a
jitter attenuator, one will have to be supplied externally. For reference purposes,
the specifications are discussed in the following documents and shown in
Figure 2-9.
E3 rate—Assume the same as DS3.
DS3 rate—Bellcore GR499, section 7.3.2 and figures 7-3, 7-4, and 7-5,
defines and describes DS3 jitter transfer.
STS-1 rate—Bellcore GR253, section 5.6.2.1, defines and describes jitter
transfer for the STS-1 rate.
Figure 2-9. Maximum Jitter Transfer Curve Requirement
0.1 dB
–19.9 dB
STS-1 Category II
DS3 Category I
DS3 Category II
(Note: All slopes are 20 dB/decade)
10 Hz
100 Hz
1 kHz
10 kHz
100 kHz
Jitter Frequency
100985_012
100985A
Conexant
2-15
CONEXANT [ CONEXANT SYSTEMS, INC ]
