STANDARD PRODUCT
PM4328 TECT3
DATASHEET
PMC-2011596
ISSUE 1
HIGH DENSITY T1/E1 FRAMER
AND M13 MULTIPLEXER
Table 6: PMON Counter Saturation Limits (E1 mode)
Counter BER
-3
FER
4.0 X 10
CRCE
FEBE
cannot saturate
cannot saturate
Table 7: PMON Counter Saturation Limits (T1 mode)
Counter
Format
BER
-3
-2
FER
SF
1.6 x 10
6.4 x 10
ESF
SF
-1
CRCE
1.28 x 10
cannot saturate
ESF
Below these 50% points, the relationship between the BER and the counter
event count (averaged over many one second samples) is essentially linear.
Above the 50% point, the relationship between BER and the average counter
event count is highly non-linear due to the likelihood of counter saturation. The
following figures show this relationship for various counters and framing formats.
These graphs can be used to determine the BER, given the average event
-3
count. In general, if the BER is above 10 , the average counter event count
cannot be used to determine the BER without considering the statistical effect of
occasional counter saturation.
Figure 28 illustrates the expected count values for a range of Bit Error Ratios in
E1 mode.
PROPRIETARY AND CONFIDENTIAL
137
PMC [ PMC-SIERRA, INC ]
