peb3456 Infineon Technologies Corporation, peb3456 Datasheet - Page 95

• 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

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Figure 4-11 CRC-4 Multiframe Alignment Recovery Algorithms
Data Sheet
Assume CRC-4 to CRC-4 interworking
Yes
Confirm primary BFA associated with CRC-4 MFA
Adjust primary BFA if necessary
Reset internal multiframe alignment status
(FRS.LMFA = 0)
Start CRC-4 performance monitoring
Out of primary BFA:
In primary BFA:
error count > 914
Inhibit incoming CRC-4 performance monitoring
Reset all timers
Set FRS.LFA/LMFA/NMF = 110
Start 400 ms timer
Enable primary BFA (loss checking procedure)
Reset internal frame alignment status
(FRS.LFA = 0)
CRC-4
or LFA
No
Yes
CRC-4 MFA search
Start 8 ms timer
MFA be found
BFA search ?
Can CRC-4
in 8 ms ?
Primary
No
Yes
B
.
95
No
Assume CRC-4 to non CRC-4 interworking
Confirm primary BFA
Set internal 400 ms timer expiration status bit
(FRS.T400 = 1)
No
Continue CRC-4 performance monitoring
BFA search
Functional Description
elapsed ?
Parallel
400 ms
good ?
timer
Yes
Yes
No
PEB 3456 E
05.2001