PEB2256HT datasheet(80/490 Pages) INFINEON

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FALC56 V1.2

PEB 2256

Functional Description E1

Data Sheet

2002-08-27

4.2.2

Doubleframe Format (E1)

The framing structure is defined by the contents of time slot 0 (refer to Table 16).

4.2.2.1

Transmit Transparent Modes

In transmit direction, contents of time slot 0 frame alignment signal of the outgoing PCM

frame are normally generated by the FALC56. However, transparency for the complete

time slot 0 can be achieved by selecting the transparent mode XSP.TT0. With the

Transparent Service Word Mask register TSWM the S

i-bits, A-bit and the Sa-bits can be

selectively switched through transparently.

Table 16

Allocation of Bits 1 to 8 of Time Slot 0 (E1)

Bit

AlternateNumber

Frames

456

Frame Containing the

Frame Alignment Signal

110

Note

Frame Alignment Signal

Frame not Containing the

Frame Alignment Signal

Service Word

Note 1)

i-bits: reserved for international use. If not used, these bits should be fixed to "1". Access to received

information trough bits RSW.RSI and RSP.RSIF. Transmission is enabled by bits XSW.XSIS and XSP.XSIF.

Note 2)

Fixed to "1". Used for synchronization.

Note 3)

Remote alarm indication: In undisturbed operation "0"; in alarm condition "1".

Note 4)

Sa-bits: Reserved for national use. If not used, they should be fixed at "1". Access to received information

trough bits RSW.RY0…4. Transmission is enabled by bits XSW.XY0…4. HDLC signaling in bits S

a4 to 8 is

selectable. As a special extension for double frame format, the S

a-bit registers RSA4 to 8/XSA4 to 8 can be

used optionally.

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