PM4332 Datasheet, PDF (285/446 Pages) PMC-Sierra, Inc – HIGH DENSITY 32 CHANNEL T1/E1/J1 FRAMER

PRELIMINARY
DATA SHEET
PMC-2011402
ISSUE 1
PM4332 TE-32
HIGH DENSITY 32 CHANNEL T1/E1/J1 FRAMER
0, AISD is asserted when 512 bit periods have been received with 2 or fewer
zeros. The indication is cleared when a 512 bit period is received with 3 or
more zeros. When the AISC bit is a logic 1, AISD is asserted when two
consecutive 512 bit periods have been received with 2 or fewer zeros. The
indication is cleared when 2 consecutive 512 bit periods are received, with
each period containing 3 or more zeros. The AISD bit is updated once every
512-bit period.
TS16AISD:
The time slot 16 Alarm Indication Signal detect (TS16AISD) signal goes high
to indicate that the incoming TS 16 data stream has a low zero-bit density.
TS16AISD is detected when the incoming TS16 signal has 3 or less zeroes in
each of 2 consecutive multi-frames. The indication is cleared when 4 or more
zeros are detected in each of two consecutive multi-frame periods, or when
the signaling multi-frame signal has been found, or when basic frame
alignment is lost.
Si[2:1]:
The Si[1] bit contains the International bit in the last received FAS frame. The
Si[2] bit contains the International bit in the last received NFAS frame (note
that this does not necessarily refer to a CRC bit).
A:
The A bit position contains the Remote Alarm Indication (RAI) bit in the last
received NFAS frame.
Sa[4:8]:
These bits contain the National bit values in the last received NFAS frame.
Note that the contents of this field are not updated while out of CRC
multiframe.
X[3], Y, X[1], X[0]:
These bits contain the value of the Extra bits (X[3], X[1] and X[0]) and the
Remote Signaling Multiframe Alarm bit (Y) in frame 0, timeslot 16 of the last
received signaling multiframe. Note that the contents of this field are not
updated while out of signaling multiframe.
SaX[4:1]:
These bits contain the SaX nibble code word extracted from the sub-
multiframe., where ‘X’ corresponds to the National bit selected by the
SaSEL[2:0] bits. SaX[1] is from the first SaX bit of the sub-multiframe; SaX[4]
is from the last. A change in these bit values sets the SaI[X] bit.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR THE INTERNAL USE OF ITS CUSTOMERS
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