PXB4340E Datasheet, PDF (33/185 Pages) Infineon Technologies AG – ICs for Communications

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setup of
new connection
CC inactive
CC activated for
VPC/VCC by uP
CC deactivated for
VPC/VCC by uP
Insert CC cell if
no user cell transmitted
for programmable Ts
(<= 1.5 sec, default 1 sec)
CC active
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At the CC termination point (see ILJXUH ):
• discard of CC cells (see ILJXUH , marker ó)
• declaration of LOC GHIHFW state and insertion of AIS cells in one second intervals after
3.5 seconds absence of user or OAM cells (see ILJXUH , marker ì)
• declaration of LOC IDLOXUH state if LOC defect state persists for 2.5 seconds.
setup of
new connetion
CC inactive
CC activated for
VPC/VCC by uP
CC deactivated for
VPC/VCC by uP
CC active
First valid ATM cell
for VPC/VCC received
notification to uP
First valid ATM cell
for VPC/VCC received
No valid ATM cell for VPC/VCC
received for programmable
Tr (<= 7.5 sec, default: 3.5 sec)
Send periodically AIS/RDI
every 1 second
Loss of
Continuity
Defect
No valid ATM cell for VPC/VCC
received for programmable
Tdef (<= 7.5 sec, default: 2.5 sec)
notification to uP
Loss of
Continuity
Failure
Send periodically AIS/RDI
every 1 second
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The LOC failure state is notified to the control processor, while still AIS cells are automatically
generated. This additional filtering according to the standards avoids frequent notifications to the
microprocessor due to sporadic errors (see bits 3..0 of register ISR0, VHFWLRQ ).
All cell insertions are initiated by the SCAN mechanism (see VHFWLRQ ). The delay times
given are default values, recommended by I.610 []. The PXB 4340 AOP allows to program
these values in multiples of the SCAN frequency which in turn is given by the microprocessor.
The corresponding register is named SCCONF0 (see VHFWLRQ  page 78).
Data Sheet
2-33
04.2000