PRELIMINARY
PM4318 OCTLIU
DATASHEET
PMC- 2001578
ISSUE 3
OCTAL E1/T1/J1 LINE INTERFACE DEVICE
signature with four zeros. In T1 mode, a logic 0 selects B8ZS line decoding which entails
substituting an B8ZS signature with eight zeros.
LOS[1:0]:
The loss of signal threshold is set by the operating mode and the state of the AMI, LOS[1]
and LOS[0] bits:
Table 13 – Loss of Signal Thresholds
Mode
AMI
LOS[1]
LOS[0]
Threshold (PCM periods)
E1
T1
X
0
0
0
0
0
0
1
1
0
0
0
1
0
1
10
15
15
31
63
175
1
X
X
X
X
X
X
When the number of consecutive zeros on the incoming PCM line exceeds the programmed
threshold, the LOSV status bit is set. For example, if the threshold is set to 10, the 11th zero
causes the LOSV bit to be set.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
131
PMC [ PMC-SIERRA, INC ]
