发明名称 |
FERNUEBERWACHUNGSANORDNUNG FUER EIN PCM-UEBERTRAGUNGSSYSTEM |
摘要 |
Two sets of line terminals in a pair of PCM head stations are interconnected by a set of transmission channels via a number of cascaded relay stations each including a line repeater for each channel. A service link extends from an address generator in one head station to a monitoring unit in each relay station, the monitoring unit including a regenerating circuit for throughgoing address codes and further including a discriminating network which, upon detecting an address code identifying that relay station, sends a sinusoidal priming signal to all the associated repeaters. A predetermined PCM test code, e.g. one containing a certain number of consecutive zeroes, is simultaneously transmitted from the same head station over the channel containing a selected repeater to be checked which, upon coincidence of the test code with the priming signal from the associated monitoring unit, closes a loop for feeding back the test code to the originating line terminal. |
申请公布号 |
DE2633922(A1) |
申请公布日期 |
1977.02.10 |
申请号 |
DE19762633922 |
申请日期 |
1976.07.28 |
申请人 |
SOCIETA ITALIANA TELECOMUNICAZIONI SIEMENS S.P.A. |
发明人 |
MANTOVANI,PIETRO,DIPL.-ING.;ROLDI,SILVIO |
分类号 |
H04B17/40;(IPC1-7):H03K13/01 |
主分类号 |
H04B17/40 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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