peb2035 ETC-unknow, peb2035 Datasheet - Page 43

• Manufacturer Part Number: peb2035
• Description: Communications Advanced Cmos Frame Aligner
• Manufacturer: ETC-unknow

Signaling
The selection of the signaling scheme is done via bit MODE.SIGM.
Especially when using the CAS-BR signaling schemes it could be necessary to define ‘clear
channels’ for data transmission. By programming registers CCB1 … CCB3 they can be selected on
a per channel basis.
4-Frame Multiframe
The allocation of the FT bits (bit 1 of frames 1 and 3) for frame alignment signal is shown in table 6.
The FS bit may be used for signaling.
Remote alarm is indicated by setting bit 2 to ’0’ in each channel.
Table 6
4-Frame Multiframe Structure
Synchronization Procedure
For multiframe synchronization, the terminal framing bits (FT bits) are observed. The synchronous
state is reached if at least one terminal framing candidate is definitely found, or the synchronizer is
forced to lock onto the next available candidate (CCR.FRS).
Semiconductor Group
Frame Number
1
2
3
4
CCS
MODE.SIGM = 0
For Common Channel Signaling, the use of time-slot 24 is recommended. In channel translation
mode 1 channel 17 (corresponding to time-slot 16 on the system internal highway) may be
selected instead of channel 24 by programming the bit FMR.SM24. The use of CCS is permitted
for all multiframe formats.
CAS-CC
MODE.SIGM = 0
Instead of CCS the above channels may be used for carrying CAS information. For positioning
of the CAS multiframe with respect to the selected multiframe structure, refer to DMI, part III,
§ 12.1.
Note: Synchronization to and synthesis of the CAS multiframe is not performed by the ACFA.
The use of CAS-CC is permitted for all multiframe formats.
CAS-BR
MODE.SIGM = 1
The use of CAS bit robbing mode is applicable to F12, ESF, and F72 multiframe format.
F
1
–
0
–
T
43
F
Service bit
Service bit
S
PEB 2035