PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 255

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

Synchronization Procedure
In the synchronous state terminal framing (FT bits) and multiframing (FS bits of the
framing header) are observed independently. Further reaction on framing errors
depends on the selected sync/resync procedure (via bit FMR2.SSP):
• FMR2.SSP = ‘0’: terminal frame and multiframe synchronization are combined
• FMR2.SSP = ‘1’: terminal frame and multiframe synchronization are separated
Semiconductor Group
Two errors within 4/5/6 framing bits (via bits FMR4.SSC1/0) of one of the above will
lead to the asynchronous state for terminal framing and multiframing. Additionally to
the bit FRS0.LFA, loss of multiframe alignment is reported via bit FRS0.LMFA.
The resynchronization procedure starts with synchronizing upon the terminal framing.
If the pulseframing has been regained, the search for multiframe alignment is initiated.
Multiframe synchronization has been regained after two consecutive correct
multiframe patterns have been received.
Two errors within 4/5/6 terminal framing bits will lead to the same reaction as
described above for the “combined” mode.
Two errors within 4/5/6 multiframing bits will lead to the asynchronous state only for
the multiframing. Loss of multiframe alignment is reported via bit FRS0.LMFA. The
state of terminal framing is not influenced.
Now, the resynchronization procedure includes only the search for multiframe
alignment. Multiframe synchronization has been regained after two consecutive
correct multiframe patterns have been received.
255
Functional Description T1 / J1
PEB 22554
09.98