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Residential Telephone Interface
Hello: What is the purpose of the diode, resistor, and capacitor network circuit that is within the junction box just inside my basement wall? I recently had a malfunction of connection to the local telephone company. (The wire connection at the outside Junction Box was brittle and broke away from the RED terminal.) In the process of troubleshooting, I removed the connections of the diode from the RED wire terminal and of a 0.464 uF capacitor from the GREEN wire terminal. There was no apparent difference noted during normal operation when this network is disconnected. There is an identification marking of: " AM-1 " followed by " 843749409 " on the pc board. This network appears to be a series connection of a diode cathode (at the RED term,), a 25 k ohm resistor, and a 0.464 uF capacitor (at the GREEN term). Can someone point me to a reading reference that explains what voltages and signals are present between/at the RED and the GREEN wire connections ? Thank you. Vince eMail: subsitute wa dot tworsx and verizon dot net |
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Residential Telephone Interface
Vince wrote:
What is the purpose of the diode, resistor, and capacitor network circuit that is within the junction box just inside my basement wall? I recently had a malfunction of connection to the local telephone company. (The wire connection at the outside Junction Box was brittle and broke away from the RED terminal.) In the process of troubleshooting, I removed the connections of the diode from the RED wire terminal and of a 0.464 uF capacitor from the GREEN wire terminal. There was no apparent difference noted during normal operation when this network is disconnected. There is an identification marking of: " AM-1 " followed by " 843749409 " on the pc board. This network appears to be a series connection of a diode cathode (at the RED term,), a 25 k ohm resistor, and a 0.464 uF capacitor (at the GREEN term). Telco wire can sometimes pick up RF inteference, much the same way as the occasional story of people's dental fillings acting as a detector circuit and picking up a radio station. It comes from the wire coming close to other metalic conductors as it snakes through your home, and again, it's a fluke thing, it only happens under certain conditions. Taking a clue from the "AM-1" marking and the presence of a capacitor, I'll hazard an educated guess that somebody along the line (previous owner?) had these problems, and the thing you removed was a "noise filter" designed to route radio frequencies to ground. -- No more big'uns for me, now I'm a 'Venture Capitalist'. I've learned to totally appreciate 'Small Firms'. |
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Residential Telephone Interface
The device is there to allow the telco to check your line from the CO. It's
best left on under normal circumstances. However, the telco installer removed ours several years ago when we got DSL installed as he said that it would interfere with the high frequency signal. However, since today most DSL is self-installed, I'm sure that the device is left in without any problems. -- Peace, BobJ "I-zheet M'drurz" wrote in message ... Vince wrote: What is the purpose of the diode, resistor, and capacitor network circuit that is within the junction box just inside my basement wall? I recently had a malfunction of connection to the local telephone company. (The wire connection at the outside Junction Box was brittle and broke away from the RED terminal.) In the process of troubleshooting, I removed the connections of the diode from the RED wire terminal and of a 0.464 uF capacitor from the GREEN wire terminal. There was no apparent difference noted during normal operation when this network is disconnected. There is an identification marking of: " AM-1 " followed by " 843749409 " on the pc board. This network appears to be a series connection of a diode cathode (at the RED term,), a 25 k ohm resistor, and a 0.464 uF capacitor (at the GREEN term). Telco wire can sometimes pick up RF inteference, much the same way as the occasional story of people's dental fillings acting as a detector circuit and picking up a radio station. It comes from the wire coming close to other metalic conductors as it snakes through your home, and again, it's a fluke thing, it only happens under certain conditions. Taking a clue from the "AM-1" marking and the presence of a capacitor, I'll hazard an educated guess that somebody along the line (previous owner?) had these problems, and the thing you removed was a "noise filter" designed to route radio frequencies to ground. -- No more big'uns for me, now I'm a 'Venture Capitalist'. I've learned to totally appreciate 'Small Firms'. |
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