发明名称 |
LOSS OF OPTICAL INPUT CIRCUIT |
摘要 |
LOSS OF OPTICAL INPUT CIRCUIT A loss of optical input detector is disclosed disposed to receive a signal voltage from a fiber-optic receiver indicating that the optical input has dropped below a preset threshold. The detector includes a voltage follower connected to the fiber-optic receiver which passes to the detector circuit the signal voltage. A comparator circuit receives the signal voltage and compares it to a reference voltage. When the signal voltage is greater than the reference voltage the comparator produces and applies to an alarm circuit a positive voltage signal. This positive voltage signal turns on the alarm circuit. The alarm circuit provides a visual alarm indication and a logic signal to a controller interface indicating a loss of the optical input signal.
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申请公布号 |
CA1287904(C) |
申请公布日期 |
1991.08.20 |
申请号 |
CA19870552800 |
申请日期 |
1987.11.19 |
申请人 |
GTE COMMUNICATION SYSTEMS CORPORATION;GTE COMMUNICATION SYSTEMS CORPORATION;GTE COMMUNICATION SYSTEMS CORPORATION |
发明人 |
KOLLANYI, MIKLOS J. |
分类号 |
H01J40/14;(IPC1-7):H01J40/14 |
主分类号 |
H01J40/14 |
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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