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: 36/74页
文件大小: 2620K
代理商: PEF2080
Semiconductor Group
37
Functional Description
Use of ECHO
Local communication of terminals connected to an S bus may be implemented by using the auxiliary
ECHO output (pin X2, in TE mode only). The timing of ECHO is identical to that of output SDO:
however, the signal is “1” everywhere except in bit positions 24 and 25 of the IOM frame, where it
is equal to the echo bits received from the S interface. Thus a layer-2 device (e.g. the ISDN
Communication Controller PEB 2070) connected to ECHO is able to receive or “hear” all other
terminals. As a special application, an S-bus local area network may be built using several TE
SBC’s and one NT (or an NT star configuration). Communication in the D and E channel is half
duplex.
Figure 19
Star Configuration in NT
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