
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
register are logic 0; if either AISPAT or AISC are logic 1, the AISONES bit is
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
1
0
X
Framed DS3 stream containing repeating
1010… pattern; overhead bits ignored.
0
1
X
Framed DS3 stream containing C-bits all
logic 0; payload bits ignored.
1
1
X
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).
0
0
0
Framed DS3 stream containing all-ones
payload pattern; overhead bits ignored.
0
0
1
Unframed all-ones DS3 stream.