PEB22554 Datasheet, PDF(64/397 Page) Siemens Semiconductor Group – ICs for Communications

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

PEB22554 Datasheet, PDF (64/397 Pages) Siemens Semiconductor Group – ICs for Communications

◁

PEB 22554

Functional Description E1

3.7.1 Doubleframe Format

The framing structure is defined by the contents of time-slot 0 (refer to table 6).

Table 6

Allocation of Bits 1 to 8 of Time-Slot 0

Bit

1

2

3

4

5

6

7

8

Alternate Number

Frames

Frame Containing the

Frame Alignment Signal Si

0

0

1

1

0

1

1

Note 1 Frame Alignment Signal

Frame not Containing

the Frame Alignment

Signal or

Service Word

Si

1

A

Sa4

Sa5

Sa6

Sa7

Sa8

Note 1 Note 2 Note 3 Note 4

Note:

1. Si bits: reserved for international use. If not used, these bits should be fixed to â1â.

Access to received information via bits RSW.RSI and RSP.RSIF. Transmission is

enabled via bits XSW.XSIS and XSP.XSIF.

2. Fixed to â1â. Used for synchronization.

3. Remote alarm indication: In undisturbed operation â0â; in alarm condition â1â.

4. Sa bits: Reserved for national use. If not used, they should be fixed at â1â. Access to

received information via bits RSW.RY0 â¦ RY4. Transmission is enabled via bits

XSW.XY0 â¦ XY4. HDLC-signaling in bits Sa4- Sa8 is selectable. (*)

Note: (*) As a special extension for double frame format, the Sa -bit registers RSA4-8 /

XSA4-8 may be used optionally.

Semiconductor Group

64

09.98

▷