PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 257

• Manufacturer Part Number: PEB22554
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Table 26
Summary Frame Recover / Out of Frame Conditions
Format
1)
Semiconductor Group
F4
F12 (D4)
and
F72 (SLC96)
F24 (ESF)
In F12 (D4) format bit 1 in frame 12 is excluded fromthe synchronization process.
Frame Recover Condition
only one FT pattern found, optional
forcing on next available FT framing
candidate
FMR2.SSP = 0:
Combined FT + FS framing search:
First searching for FT pattern with
optional forcing on next available fr.
candidates and then for 2
consecutive correct FS pattern
FMR2.SSP = 1:
Separated FT + FS pattern search:
Loss of FT framing will start first
searching for FT and then for 2
consecutive correct FS pattern
Loss of FS framing will start only the
FS pattern
FMR2.MCSP/SSP = 00:
only one FAS pattern found,
optional forcing on next available
FAS framing candidate with
discarding of all remaining fr. cand.
FMR2.MCSP/SSP = 01:
3 consecutive correct multiframing
found independent of CRC6 errors.
FMR2.MCSP/SSP = 10:
choosing multiple framing pattern
step by step, optional forcing on
next available FAS framing pattern
with discarding only of the previous
assumed framing candidate.
FMR2.MCSP/SSP = 11:
FAS framing correctly found and
CRC6 check error free.
1)
. search.
257
1)
1)
.
.
Out of Frame Condition
2 out of 4/5/6 incorrect FT bits
FMR2.SSP=0 : 2 out of 4/5/6
incorrect FT or FS bits
FMR2.SSP= 1 :
2 out of 4/5/6 incorrect FT bits will
search FT and FS framing bits,
2 out of 4/5/6 incorrect FS bits
will search only the FS framing.
2 out of 4/5 incorrect FAS bits
or
2 out of 6 incorrect FAS bits per
multiframe
or
4 consecutive incorrect
multiframing pattern
or
more than 320 CRC6 errors per
second interval
Functional Description T1 / J1
PEB 22554
09.98