参数资料
型号: PEF2080
厂商: SIEMENS AG
英文描述: S/T Bus Interface Circuit(SBC)
中文描述: S / T的总线接口电路(SBC)的
文件页数: 19/74页
文件大小: 2620K
代理商: PEF2080
Semiconductor Group
20
Functional Description
2.3
Interfaces
S Interface
According to CCITT recommendation I.430, pseudo-ternary encoding with 100 % pulse width is
used on the S interface. A logical 1 corresponds to a neutral level (no current), whereas logical 0′s
are encoded as alternating positive and negative pulses. An example is shown in
figure 5
.
Figure 5
S-Interface Line Code
One S frame consists of 48 bits, at a nominal bit rate of 192 kbit/s. Thus each frame carries two
octets of B1, two octets of B2, and four D bits, according to the B1 + B2 + D structure defined for
the ISDN basic access (total useful data rate: 144 kbit/s). Frame begin is marked using a code
violation (no mark inversion). The frame structures (from network to subscriber, and subscriber to
network) are shown in
figure 6
.
Figure 6
Frame Structure at Reference Ponts S and T (CCITT I.430)
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