STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
PROPRIETARY AND CONFIDENTIAL
210
Register 063H: T1 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
YELD
AISD
X
X
X
X
X
X
X
X
R
R
R
When the E1/T1B bit of the Global Configuration register is a logic 1, this register
is held reset.
This register indicates the presence or absence of one or more OOF
occurrences within the last 40 ms; the presence or absence of the Yellow alarm
signal over the last 40 ms; and indicate the presence or absence of the AIS
alarm signal over the last 60 ms.
REDD:
When REDD is a logic 1, one or more out of frame events have occurred
during the last 40 ms interval. When REDD is a logic 0, no out of frame
events have occurred within the last 40 ms interval.
YELD:
When YELD is logic 1, a valid Yellow signal was present during the last 40 ms
interval. When YELD is logic 0, the Yellow signal was absent during the last
40 ms 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 SLC96 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;