PM8313 datasheet(115/192 Pages) PMC

115 / 192 page

PM8313 D3MX

DATA SHEET

PMC-920702

ISSUE 5

M13 MULTIPLEXER

105

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).

PM8313 Datasheet(PDF) 115 Page - PMC-Sierra, Inc