PM7346 datasheet(174/419 Pages) PMC

174 / 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 153

AISONES:

The AISONES bit controls the pattern used to detect the alarm indication

signal (AIS) when both AISPAT and AISC bits in DS3 FRMR Configuration

ignored. When a logic 0 is written to AISONES, the algorithm checks that a

framed all-ones payload pattern (1111...) signal is observed for a period of

time before declaring AIS. Only the payload bits are observed to follow an all-

ones pattern, the overhead bits (X, P, M, F, C) are ignored. When a logic 1 is

written to AISONES, the algorithm checks that an unframed all-ones pattern

(1111...) signal is observed for a period of time before declaring AIS. In this

case all the bits, including the overhead, are observed to follow an all-ones

pattern. The valid combinations of AISPAT, AISC, and AISONES bits are

summarized below:

Table 11

- DS3 FRMR AIS Configurations

AISPAT

AISC

AISONES

AIS Detected

Framed DS3 stream containing repeating

1010… pattern; overhead bits ignored.

Framed DS3 stream containing C-bits all

logic 0; payload bits ignored.

Framed DS3 stream containing repeating

1010… pattern in the payload, C-bits all

logic 0, and X-bits=1. This can be

detected by setting both AISPAT and AISC

high, and declaring AIS only when AISV=1

and FERFV=0 (Register x33H).

Framed DS3 stream containing all-ones

payload pattern; overhead bits ignored.

Unframed all-ones DS3 stream.

PM7346 Datasheet(PDF) 174 Page - PMC-Sierra, Inc