PM4341AT1XC
DATA SHEET
PMC-900602
ISSUE 7
T1 FRAMER/TRANSCEIVER
Register 2FH: ALMI Alarm Detection Status
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Unused
Unused
Unused
Unused
Unused
REDD
X
X
X
X
X
X
X
X
R
R
R
YELD
AISD
This register indicates the presence or absence of one or more OOF
occurrences within the last 40ms; the presence or absence of the YELLOW
ALARM signal over the last 40ms; and indicates the presence or absence of the
AIS ALARM signal over the last 60ms.
REDD:
When REDD is a logic 1, one or more out of frame events have occurred
during the last 40ms interval. When REDD is a logic 0, no out of frame events
have occurred within the last 40ms interval.
YELD:
When YELD is logic 1, a valid YELLOW signal was present during the last
40ms interval. When YELD is logic 0, the YELLOW signal was absent during
the last 40ms interval. For each framing format, a valid YELLOW signal is
deemed to be present if:
• bit 2 of each channel is not logic 0 for 16 or fewer times during the
40 ms interval for SF and SLC®96 framing formats;
• the Y-bit is not logic 0 for 4 or fewer times during the 40 ms interval
for T1DM framing format;
• the 16-bit YELLOW bit oriented code is received error-free 8 or
more times during the interval for ESF framing format with a 4 kHz
data link;
• the 16-bit YELLOW bit oriented code is received error-free 4 or
more times during the interval for ESF framing format with a 2 kHz
data link.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
126
PMC [ PMC-SIERRA, INC ]
