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: 20/74页
文件大小: 2620K
代理商: PEF2080
Semiconductor Group
21
Functional Description
Digital Interface
IOM Frame Structure
The SBC is provided with a digital interface, the IOM interface, for communication with other ISDN
devices, in other words with units realizing OSI layer-1 functions (such as the ISDN Echo
Cancellation Circuit IEC PEB 2090) or layer-2 functions (such as the ISDN Communication
Controller ICC PEB 2070).
The IOM interface is a four-wire serial interface with: a bit clock, a frame clock and one data line per
direction (
figure 7
).
The ISDN data rate of 144 kbit/s (B1 + B2 + D) is transmitted transparently in both directions over
the interface. In addition, it is necessary to interchange control information for activation and
deactivation of OSI layer 1 and for switching of test loops. This information is transferred using time
division multiplexing with a 125-
μ
s total frame length.
Figure 7
IOM
Interface Signals
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