PM6341 E1XC
DATA SHEET
PMC-910419
ISSUE 8
E1 FRAMER/TRANSCEIVER
Register 27H: FRMR Maintenance/Alarm Status
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R
R
R
R
R
R
RRA
RRMA
AISD
X
X
X
X
X
X
X
X
T16AISD
RED
AIS
Unused
Unused
Reading this register returns the current state value of the RRA, RRMA, AISD,
T16AISD, RED, and AIS maintenance/alarm statuses.
RRA:
The RRA bit is a logic one when the "A" bit (bit 3 in time slot 0 of the non-
frame alignment signal frame) has been a logic one for 2 or 3 consecutive
non-frame alignment signal frames, as determined by the RADEB bit.The
RRA output is updated every two frames.
RRMA:
The RRMA bit is a logic one when the "Y" bit (bit 6 in time slot 16 in frame 0
of the signalling multiframes) has been a logic one for 2 or 3 consecutive
signalling multiframes, as determined by the RMADEB bit.. The RRMA bit is
updated every 16 frames.
AISD:
The AISD bit is a logic one after an unframed pattern of all ones with less
than 3 zeros in two consecutive frame times (512 bits) has been detected.
The AISD bit is updated every 512 bit times.
T16AISD:
The T16AISD is a logic one after an all-ones byte has been detected in time
slot 16 for 2 consecutive frames while out of signalling multiframe alignment.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
131
PMC [ PMC-SIERRA, INC ]
