参数资料
型号: PEF80902
厂商: INFINEON TECHNOLOGIES AG
英文描述: 4B3T Second Gen. Modular ISDN NT(Ordinary)
中文描述: 4B3T二将军模块化综合业务数字网新台币(普通)
文件页数: 41/83页
文件大小: 1168K
代理商: PEF80902
PEF 80902
Functional Description
Data Sheet
33
2001-11-12
2.4
S-Transceiver
The S-Transceiver offers the NT state machine described in the User
s Manual V3.4 [8].
The S-transceiver basic configurations are performed via pin strapping.
2.4.1
Line Coding, Frame Structure
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.
Figure 9
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 9
).
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.
0 1 1
code violation
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