PM7344 S/UNI-MPH
DATA SHEET
PMC-950449
ISSUE 6
MULTI-PHY USER NETWORK INTERFACE
Registers 027H, 127H, 227H and 327H: E1-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
RRA
Unused
AISD
Unused
RED
AIS
Unused
Unused
X
X
X
X
X
X
X
X
R
R
R
Reading these registers returns the current state value of the RRA, AISD, 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 in the
E1-FRMR Maintenance Mode Options register.
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.
RED:
The RED bit is a logic one if an out of frame condition has persisted for 104
ms. The RED bit returns to a logic zero when a out of frame condition has
been absent for 104 ms.
AIS:
The AIS bit is a logic one when an unframed all-ones condition has persisted
for 104 ms. The AIS bit returns to a logic zero when the AIS condition has
been absent for 104 ms.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
125
PMC [ PMC-SIERRA, INC ]
