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Re: Telephone Tip/Ring Tester Schematic

Discussion in 'Misc Electronics' started by rw, Jul 12, 2003.

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  1. rw

    rw Guest

    if you got a multimeter and a phone you can start testing.
    check the voltage across the pair, should be 48VDC in US, 60VDC
    in europe.
    place a 600 ohm resistor, 5W across the pair and measure the current
    should be 20 to 40mA (holding current)

  2. How do you distinguish between Tip and Ring?

    Harry C.

  3. How do you distinguish between Tip and Ring?

    Harry C.

  4. How do you distinguish between Tip and Ring?

    Harry C.
  5. Ross Herbert

    Ross Herbert Guest

    They must have changed it then... but somehow I doubt it. See and

    Anyway, if the tech reversed the main frame jumper... the wire colors
    mean nothing. You need to check the polarity with respect to earth. The
    normal polarity is;

    The 'A' leg (or TIP) is connected to earth at the exchange and therefore
    the 'B' leg (or RING) will be -ve wrt to the 'A' leg (or TIP).

    Connect a digital voltmeter between both wires of the line.
    When the meter reads -52V the red lead will be connected to the 'B' leg
    (or RING) and the black lead will be connected to the 'A' leg (or TIP).

    Ross Herbert
  6. Dave VanHorn

    Dave VanHorn Guest

    When they converted the Waikiki exchange to ESS, half the subscribers lost
    the ability to dial.
    Seems there were a lot of reversed reversals in the middle of the wiring,
    and the installers just flipped the leads till it worked. :)

    Even into the 80's I had no true DTMF service, though the telco charged for
    They put a tone to pulse converter on each line. "Beep"-Dit-Dit-Dit...

    This was also a time when you couldn't dial 800 numbers from hawaii.
    Most frustrating when some companies had ads with only 800 numbers on them.
  7. Been there, done that, got the T-shirt. Damn installers ruined a
    lotta times and I get stuck with straightening out their abortions.
    I had pulse dial, and got my 300 baud Smartmodem, with DTMF. I used
    the TT on it once, and the Pac Hell bastards tried to contact me and
    make me pay for the service. They wanmted a buck twenty a month!!
    For something that benefitted them more than the customer! Finally
    the Calif PUC came to their senses and made the telcos give everyone
    DTMF for free, so we could all call the 'voice jail' systems without
    having to switch from pulse to tone after making each call.
    Yeah, lotta good that does the customer. Like when your number is

    I had a Rat Shack TRS-80 Model 100 with the modem that dialed at 20
    PPS, and it worked okay, too. Twice as fast as regular pulse. I
    believe it still would work today, too.


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