peb2035 ETC-unknow, peb2035 Datasheet - Page 31

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

Operating Modes
The operating mode of the ACFA is selected by programming the carrier data rate, line code,
multiframe structure, and signaling scheme.
The ACFA implements all of the standard and/or common framing structures for both PCM 30
(CEPT, 2048 kbit/s) and PCM 24 (T1, 1544 kbit/s) carriers. These are summarized in table 1, along
with the signaling types applicable in each of the multiframe formats. ’General signaling’ refers to the
support the ACFA provides for handling the data link or service bits, as the case may be, in the
multiframe.
Table 1
Summary of ACFA Framing and Supported Signaling Modes
CRC
Signaling
CCS
CAS-CC
CAS-BR
General
Signaling
CCS
CAS-CC
CAS-BR
For CCS, CAS-CC, and CAS-BR, different types of support are provided.
Note: All signaling procedures (e.g. HDLC), signaling frame synchronization and synthesis have to
The next pages give a general description of the PCM modes and their assigned framing formats.
After RESET, the ACFA is switched to PCM 30 doubleframe format automatically.
Semiconductor Group
be performed by an external controller (e.g. SAB 82525, HSCX for CCS).
= Common Channel Signaling
= Channel Associated Signaling (Common Channel)
= Channel Associated Signaling (Bit Robbing)
Double-
Frame
–
–
e.g. TS16
e.g. TS16
S bits
PCM 30
CRC-Multi-
Frame
–
CRC4
e.g. TS16
e.g. TS16
S bits
4-Frame
Multiframe
–
–
e.g. Ch24
e.g. Ch24
FS bits
31
12-Frame
Multiframe
–
–
e.g. Ch24
e.g. Ch24
PCM 24
Extended
Multiframe
CRC6
e.g. Ch24
e.g. Ch24
DL bits
Remote
Switch M.
–
PEB 2035
e.g. Ch24
e.g. Ch24
FS bits