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STANDARD PRODUCT
PMC-Sierra, Inc.
PM6344 EQUAD
PMC-951013
ISSUE 5
QUADRUPLE E1 FRAMER
109
Register 021H, 0A1H, 121H, 1A1H: FRMR Maintenance Mode Options
Bit
Type
Function
Default
Bit 7
R/W
FASC
0
Bit 6
R/W
BIT2C
0
Bit 5
R/W
SMFASC
0
Bit 4
R/W
T16C
0
Bit 3
R/W
RADEB
0
Bit 2
R/W
RMADEB
0
Bit 1
R
CMFACT
X
Bit 0
R
EXCRCE
X
FASC:
The FASC bit selects the criterion used to declare loss of frame alignment
signal: a logic 0 in the FASC bit position enables declaration of loss of frame
alignment when 3 consecutive frame alignment patterns have been received
in error; a logic 1 in the FASC bit position enables declaration of loss of frame
when 4 consecutive frame alignment pattern errors are detected.
BIT2C:
The BIT2C bit enables the additional criterion that loss of frame is declared
when bit 2 in time slot 0 of NFAS frames has been received in error on 3
consecutive occasions: a logic 1 in the BIT2C position enables declaration of
loss of frame alignment when bit 2 is received in error; a logic 0 in BIT2C
enables declaration of loss of frame alignment based on the setting of FASC,
only.
SMFASC:
The SMFASC bit selects the criterion used to declare loss of signaling
multiframe alignment signal: a logic 0 in the SMFASC bit position enables
declaration of loss of signaling multiframe alignment when 2 consecutive
multiframe alignment patterns have been received in error; a logic 1 in the
SMFASC bit position enables declaration of loss of signaling multiframe when
2 consecutive multiframe alignment patterns have been received in error or
when time slot 16 contains logic 0 in all bit positions for 1 or 2 multiframes
based on the criterion selected by T16C.