PM7347 datasheet(91/341 Pages) PMC

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S/UNI®-JET Data Sheet

Released

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

Document ID: PMC-1990267, Issue 3

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

The DLINV bit provides polarity control for the DS3 C-bit Parity PMDL, which is located in

the three C-bits of M-subframe 5. When a logic one is written to DLINV, the PMDL is

inverted before being processed. The rationale behind this bit is to safe-guard the S/UNI-JET

in case the inversion is required in the future. Currently, the ANSI standard T1.107 specifies

that the C-bits, which carry the PMDL, 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.

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 one,

the NR byte is extracted from the G.832 stream and terminated by RDLC. When RNETOP is

logic zero, 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

The TNETOP bit enables the Network Operator Byte (NR) inserted in the G.832 E3 stream to

be sourced by the internal HDLC transmitter, TDPR. When TNETOP is logic one, the NR

byte is inserted into the G.832 stream through the TDPR block; the GC byte of the G.832 E3

stream is sourced by through the TOH and TOHINS pins. If TOH and TOHINS are not

active, then an all-ones signal will be inserted into the GC byte. When TNETOP is logic zero,

the GC byte is inserted into the G.832 stream through the TDPR block; the NR byte of the

G.832 E3 stream is sourced by the TOH and TOHINS pins. If TOH and TOHINS are not

active, then an all-ones signal will be inserted into the NR byte.

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