CX28331 datasheet(47/68 Pages) CONEXANT

47 / 68 page

CX28331/CX28332/CX28333

2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2.4 Jitter Tolerance

100985A

Conexant

2-15

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

Jitter Frequency

–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

100985_012

CX28331 Datasheet(PDF) 47 Page - Synaptics Incorporated.