STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
be ±200 Hz and that the XCLK input accuracy can be ±100 ppm, the minimum
jitter tolerance for various differences between the frequency of PLL reference
clock and XCLK are shown in Figure 10.
Figure 10
- TJAT Minimum Jitter Tolerance vs. XCLK Accuracy
70
68
66
65
60
JAT MIN.
JITTER
TOLERANCE,
UI pp
61
55
MAX. FREQUENCY
100
200
0
250
32
300
354
Hz
OFFSET
100 ,± ppm
XCLK ACCURACY
Jitter Transfer
For T1 applications, the output jitter for jitter frequencies from 0 to 5.7 Hz (7.6 Hz
for E1) is no more than 0.1 dB greater than the input jitter, excluding residual
jitter. Jitter frequencies above 5.7 Hz (7.6 Hz for E1) are attenuated at a level of
6 dB per octave, as shown in Figure 11.
PROPRIETARY AND CONFIDENTIAL
60
PMC [ PMC-SIERRA, INC ]
