PSF21150 INFINEON [Infineon Technologies AG], PSF21150 Datasheet - Page 51
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PSF21150
Manufacturer Part Number
PSF21150
Description
IPAC-X ISDN PC ADAPTER CIRCUIT
Manufacturer
INFINEON [Infineon Technologies AG]
Datasheet
1.PSF21150.pdf
(272 pages)
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Part Number:
PSF21150FV1.4
Manufacturer:
INFINEON/英飞凌
Quantity:
20 000
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PSB 21150
PSF 21150
Description of Functional Blocks
3.3.1
S/T-Interface Coding
Transmission over the S/T-interface is performed at a rate of 192 kbit/s. 144 kbit/s are
used for user data (B1+B2+D), 48 kbit/s are used for framing and maintenance
information.
Line Coding
The following figure illustrates the line code. A binary ONE is represented by no line
signal. Binary ZEROs are coded with alternating positive and negative pulses with two
exceptions:
For the required frame structure a code violation is indicated by two consecutive pulses
of the same polarity. These two pulses can be adjacent or separated by binary ONEs.
In bus configurations a binary ZERO always overwrites a binary ONE.
0 1 1
code violation
Figure 19
S/T -Interface Line Code
Frame Structure
Each S/T frame consists of 48 bits at a nominal bit rate of 192 kbit/s. For user data
(B1+B2+D) the frame structure applies to a data rate of 144 kbit/s (see
Figure
20).
In the direction TE
NT the frame is transmitted with a two bit offset. For details on the
framing rules please refer to ITU I.430 section 6.3. The following figure illustrates the
standard frame structure for both directions (NT
TE and TE
NT) with all framing
and maintenance bits.
Data Sheet
51
2000-07-21
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