PM8313D3MX Datasheet, PDF (115/192 Pages) PMC-Sierra, Inc – M13 MULTIPLEXER

DATA SHEET
PMC-920702
ISSUE 5
PM8313 D3MX
M13 MULTIPLEXER
M3O8:
The M3O8 bit configures the out of frame decision criteria. If M3O8 is a logic
1, out of frame is declared if at least 3 of 8 framing bits are in error. If M3O8
is a logic 0, the standard 3 of 16 bits in error criteria is used.
MBDIS:
The MBDIS bit disables the use of M-bit errors as a criteria for losing frame
alignment. When MBDIS is set to logic 1, M-bit errors are disabled from
causing an OOF; the loss of frame criteria is based solely on the number of F-
bit errors selected by the M3O8 bit. When MBDIS is set to logic 0, errors in
either M-bits or F-bits are enabled to cause an OOF. When MBDIS is logic 0,
an OOF can occur when one or more M-bit errors occur in 3 out of 4
consecutive M-frames, or when the F-bit error ratio selected by the M3O8 bit.
is exceeded.
FDET:
The FDET bit selects the fast detection timing for AIS, IDLE and RED. When
FDET is set to logic 1, the AIS, IDLE, and RED detection time is 2.23 ms;
when FDET is set to logic 0, the detection time is 13.5 ms.
AISPAT:
The AISPAT bit controls the pattern used to detect the alarm indication signal
(AIS). When a logic 1 is written to AISPAT, the AIS detection algorithm checks
that a framed DS3 signal containing the repeating pattern 1010... is present.
The C-bits are checked for the value specified by the AISC bit setting. When a
logic 0 is written to AISPAT, the AIS detection algorithm is determined solely
by the settings of AISC and AISONES register bits (see bit mapping table in
the Additional Configuration Register description).
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