peb3456e Infineon Technologies Corporation, peb3456e Datasheet - Page 285

• Manufacturer Part Number: peb3456e
• Description: Channelized T3 Termination, With Ds3 Framer, M13 Multiplexer, T1/e1 Framers And 256-channel Hdlc/ppp Controller
• Manufacturer: Infineon Technologies Corporation

LPCD
SEC
N
AIC
XBIT
IDLES
AISS
Data Sheet
r
/AICC
This bit indicates that the spare data link transmit buffer (register
D3TSDL) is empty.
Loopback Code Detected
This bit indicates a changes in register D3RLPCS.
1 Second Flag
This bit toggles every second synchronously with the one second
interrupt. It can be used by software to synchronize 1 second events
when the ’One second interrupt’ vector is masked.
N
This bit contains an image of the DS3 frame overhead bit in block 5 of
subframe 1. It is updated only if its state persists for 3 multiframes and
DS3 frame is aligned.
AIC-bit changed (M13 asynchronous format)
This bit indicates a change of the AIC-bit (first C-bit of the first subframe)
since the last read of this register.
AIC bit Image (DS3 frame overhead bit in block 3 of subframe 1)
This bit contains an image of the DS3 frame overhead bit in block 3 of
subframe 1. It is updated only if its state persists for 3 multiframes and
DS3 frame is aligned.
X bit Image (DS3 frame overhead bit in block 1 of subframes 1 and 2)
This bit contains an image of the DS3 frame overhead bit in block 1 of
subframes 1 and 2. It is updated only if both bits in a DS3 multiframe
have the same value, its state persists for at least 3 multiframes and
when the DS3 framer is in synchronous state.
Idle State
This bit indicates that the idle pattern (framed ...1100... with C-bits=’0’ in
subframe 3 and X-bits=’1’) was persistent as per alarm timing
parameters defined in register D3RAP. Idle is considered active in a
multiframe when fewer than 15 errors are detected. At 10
errors per multiframe are typical. 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 is set or cleared
respectively.
AIS Alarm State.
This bit indicates the AIS alarm state. AIS can be a framed ’..1010..’
pattern with C-bits=’0’ and X-bits=’1’ or an unframed all ‘1’ pattern. This
is determined by D3TCFG.AISC. AIS is considered active in a
r
-bit Image (C-bit parity format only)
285
Register Description
-3
PEB 3456 E
error rates, 5
05.2001