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

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'.

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'.