peb3456 Infineon Technologies Corporation, peb3456 Datasheet - Page 286
peb3456
Manufacturer Part Number
peb3456
Description
Channelized T3 Termination With Ds3 Framer, M13 Multiplexer, T1/ E1 Framers And 256 Channel Hdlc/ppp Controller
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB3456.pdf
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COFA
REDS
LOSS
FAS
Data Sheet
multiframe when fewer than 15 errors are detected and is declared when
it was persistent as per alarm timing parameters defined in register
D3RAP. At 10
time necessary to change the flag could be greater if the FAS flag is not
constant. The frame alignment state is integrated by incrementing or
decrementing a counter at the end of each multiframe when the FAS flag
is set or cleared respectively.
Red Alarm State (loss of frame alignment)
This bit indicates that red alarm was persistent as per alarm timing
parameter defined in register D3RAP. The red alarm flag nominally
changes when loss of frame alignment condition persists for either 32 or
128 multiframes. This is determined by bit D3RCFG.SAIT. The exact
time necessary to change the flag could be greater if the FAS flag is not
constant. The frame alignment state is integrated by incrementing or
decrementing a counter at the end of each multiframe when the FAS flag
set or cleared respectively.
Loss of DS3 Input Signal
This bit indicates that the received DS3 bit stream contained at least 175
consecutive ‘0’s. It is deasserted when 59 ‘1’ bits are detected in 175
clocks (1/3 density). Following removal of LOS, a 10 msec guard timer
is started. If a new LOS occurs, the release condition is extended so that
the 1/3 density condition must persist for at least 10 msec. This prevents
chatter and excessive interrupts.
Change of Frame Alignment.
This bit indicates a change of frame alignment event. It is set when the
DS3 framer found a new frame alignment and when the new frame
position differs from the expected frame position.
DS3 Frame Alignment State
This bit indicates that the DS3 framer is not aligned.
-3
error rates, 5 errors per multiframe are typical. The exact
286
Register Description
PEB 3456 E
05.2001
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