STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
PROPRIETARY AND CONFIDENTIAL
423
counter saturation reaches 50% is shown for various counters in Table 112 for
E1 mode, and in Table 113 for T1 mode.
Table 112
- PMON Counter Saturation Limits (E1 mode)
Counter
BER
LCV
4.0 X 10
-3
FER
4.0 X 10
-3
CRCE
cannot saturate
FEBE
cannot saturate
Table 113
- PMON Counter Saturation Limits (T1 mode)
Counter
Format
BER
LCV
all
5.3 x 10
-3
FER
SF
1.6 x 10
-3
T1DM
1.6 x 10
-3
SLC96
3.2 x 10
-2
ESF
6.4 x 10
-2
CRCE
SF
1.28 x 10
-1
T1DM
1.83 x 10
-2
SLC96
2.56 x 10
-1
ESF
cannot saturate
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
count. In general, if the BER is above 10
-3
, the average counter event count
cannot be used to determine the BER without considering the statistical effect of
occasional counter saturation.