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PEB2256HT датащи(PDF) 89 Page - Infineon Technologies AG

номер детали PEB2256HT
подробное описание детали  E1/T1/J1 Framer and Line Interface Component for Long and Short Haul Applications
PDF  490 Pages
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производитель  INFINEON [Infineon Technologies AG]
домашняя страница  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

PEB2256HT датащи(HTML) 89 Page - Infineon Technologies AG

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FALC56 V1.2
PEB 2256
Functional Description E1
Data Sheet
89
2002-08-27
Note: E-bits can be processed by the system interface. Setting bit TSWM.TSIS enables
transparency for E-bits in transmit direction (refer to Table 18).
Figure 22
CRC4 Multiframe Alignment Recovery Algorithms (E1)
ITD10310
OUT of Primary BFA:
Inhibit Incoming CRC-4 Performance Monitoring
Reset all Timers
Set FRS0.LFA/LMFA/NMF = 110
No
BFA Search ?
Primary
Yes
Reset Internal Frame Alignment Status
Start 400 ms Timer
IN Primary BFA:
Enable Primary BFA Loss Checking Process
(FRS0.LFA = 0)
Start 8 ms Timer
Can CRC-4
MFA be found
Yes
in 8 ms ?
400 ms
Timer
Elapsed ?
Yes
No
Parallel
BFA Search
Good ?
No
No
Assume CRC-4 to CRC-4 Interworking:
Confirm Primary BFA Associated with CRC-4 MFA
Reset Internal Multiframe Alignment Status
Adjust Primary BFA if Necessary
(FRS0.LMFA = 0)
Confirm Primary BFA
Set Internal 400 ms Timer Expiration Status Bit
Assume CRC-4 to non CRC-4 Interworking:
(FRS0.NMF = 1)
Start CRC-4 Performance Monitoring
Yes
or LFA ?
Error Count
CRC-4
No
Continue CRC-4 Performance Monitoring
_
< 915
Yes
CRC-4 MFA Search



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