PM7347 datasheet(137/341 Pages) PMC

137 / 341 page

S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

137

Document ID: PMC-1990267, Issue 3

Bit

Type

Function

Default

Bit 7

R/W

CBTRAN

Bit 6

R/W

AIS

Bit 5

R/W

IDL

Bit 4

R/W

FERF

Bit 3

R/W

Reserved

Bit 2

Unused

Bit 1

Unused

Bit 0

R/W

CBIT

The CBIT bit enables the DS3 C-bit parity application. When CBIT is written with a logic

one, C-bit parity is enabled, and the S/UNI-JET modifies the C-bits as required to include the

path maintenance data link, the FEAC channel, the FEBE indication, and the path parity.

When CBIT is written with a logic zero, the M23 application is selected, and each C-bit is set

to logic one by the S/UNI-JET except for the first C-bit of the frame, which is forced to

toggle every frame. Note: The C-bits may be modified as required using the DS3 overhead

access port (TOH) regardless of the setting of this bit.

FERF

The FERF bit enables insertion of the far end receive failure maintenance signal in the DS3

stream. When FERF is written with a logic one, the X1 and X2 overhead bit positions are set

to logic zero. When FERF is written with a logic zero, the X1 and X2 overhead bit positions

in the DS3 stream are set to logic one.

IDL

The IDL bit enables insertion of the idle maintenance signal in the DS3 stream. When IDL is

written with a logic one, the DS3 payload is overwritten with the repeating pattern 1100.. The

DS3 overhead bit insertion (X, P, M F, and C) continues normally. When IDL is written with

a logic zero, the idle signal is not inserted.

AIS

The AIS bit enables insertion of the AIS maintenance signal in the DS3 stream. When AIS is

written with a logic one, the DS3 payload is overwritten with the repeating pattern 1010.. The

DS3 overhead bit insertion (X, P, M and F) continues normally. The values inserted in the C-

bits during AIS transmission are controlled by the CBTRAN bit in this register. When AIS is

written with a logic zero, the AIS signal is not inserted.

PM7347 Datasheet(PDF) 137 Page - PMC-Sierra, Inc

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