PM7346 datasheet(179/419 Pages) PMC

179 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 158

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

CBIT:

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

with a logic 1, C-bit parity is enabled, and the S/UNI-QJET modifies the C-bits

as required to include the path maintenance data link, the FEAC channel, the

far end block error indication, and the path parity. When CBIT is written with a

logic 0, the M23 application is selected, and each C-bit is set to logic 1 by the

S/UNI-QJET except for the first C-bit of the frame, which is forced to toggle

every frame. Note that 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 1, the X1 and X2

overhead bit positions are set to logic 0. When FERF is written with a logic 0,

the X1 and X2 overhead bit positions in the DS3 stream are set to logic 1.

IDL:

The IDL bit enables insertion of the idle maintenance signal in the DS3

stream. When IDL is written with a logic 1, 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 0, the idle signal

is not inserted.

PM7346 Datasheet(PDF) 179 Page - PMC-Sierra, Inc

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