PM8313 datasheet(73/192 Pages) PMC

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PM8313 D3MX

DATA SHEET

PMC-920702

ISSUE 5

M13 MULTIPLEXER

Bit

Type

Function

Default

Bit 7

R/W

TNR

Bit 6

RNR

Bit 5

R/W

ALTFEBE

Bit 4

R/W

REDO

Bit 3

R/W

RED2ALME

Bit 2

R/W

DS2ALME

Bit 1

R/W

RED3ALME

Bit 0

R/W

DS3ALME

The Master Alarm Enable/Network Requirement Bit Register is provided at

D3MX read/write address 06H.

DS3ALME:

The DS3 Alarm Enable (DS3ALME) bit allows the automatic generation of

AIS in all of the demultiplexed DS2s upon a DS3 alarm condition. If

DS3ALME is a logic 1, a DS3 loss of signal (>175 zeros), a DS3 out-of-frame

(OOF) condition (i.e. immediately after 3-of-n F-bit errors where n is 8 or 16,

or 3-of-4 M-frames containing M-bit errors), DS3 idle code detection or DS3

AIS detection causes all of the DS2s to be replaced by an unframed all ones

pattern immediately. Generation of AIS continues while the detected alarm

condition persists. If DS3ALME is a logic 0, AIS can still be generated in the

demultiplexed DS2s under software control by setting the bits in the MX23

Demux AIS Insert Register.

RED3ALME:

The RED DS3 Alarm Enable (RED3ALME) bit works in conjunction with the

DS3ALME and enables detection of DS3 RED condition to be used in place

of DS3 loss of signal and DS3 out-of-frame in the above criteria for

demultiplexed AIS generation. When DS3ALME is set to logic 1 and

REDALME is set to logic 1, the occurrence of LOS or OOF for 127

consecutive M-frames (or 21 consecutive M-frames, if FDET is set to logic 1

in the DS3 FRMR configuration register) causes a DS3 RED alarm condition

and generates the DS2 AIS. When DS3ALME is set to logic 1 and REDALME

is set to logic 0, any occurrence of LOS or OOF generates the DS2 AIS. If

DS3ALME is a logic 0, the REDALME bit is ignored.

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