PM7346 datasheet(121/419 Pages) PMC

121 / 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 100

Control

Bit

Type

Function

Default

Bit 7

R/W

LCDEN

Bit 6

R/W

AISEN

Bit 5

R/W

RBLEN

Bit 4

R/W

OOFEN

Bit 3

R/W

LOSEN

Bit 2

R/W

TNETOP

Bit 1

R/W

RNETOP

Bit 0

R/W

DLINV

DLINV:

The DLINV bit provides polarity control for the DS3 C-bit Parity path

maintenance data link which is located in the 3 C-bits of M-subframe 5.

When a logic 1 is written to DLINV, the path maintenance data link is inverted

before being processed. The rationale behind this bit is as follows: currently

ANSI standard T1.107 specifies that the C-bits (which carry the path

maintenance data link) be set to all zeros while the AIS maintenance signal is

transmitted. The data link is obviously inactive during AIS transmission, and

ideally the HDLC idle sequence (all ones) should be transmitted. By inverting

the data link, the all zeros C-bit pattern becomes an idle sequence and the

data link is terminated gracefully. Although this inversion is currently not

specified in ANSI T1.107a, this bit is provided to safe-guard the S/UNI-QJET

in case the inversion is required in the future.

RNETOP:

The RNETOP bit enables the Network Operator Byte (NR) extracted from the

G.832 E3 stream to be terminated by the internal HDLC receiver, RDLC.

When RNETOP is logic 1, the NR byte is extracted from the G.832 stream

and terminated by RDLC. When RNETOP is logic 0, the GC byte is extracted

from the G.832 stream and terminated by RDLC. Both the NR byte and the

GC byte are extracted and output on the ROH pin for external processing.

TNETOP:

PM7346 Datasheet(PDF) 121 Page - PMC-Sierra, Inc

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