1A2 Key System

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MurrayB:
I went to 30 then 45 with no joy. I reduced the current back to default.

Stewart:
Quote from: MurrayB on April 24, 2012, 09:52:56 am

I went to 30 then 45 with no joy. I reduced the current back to default.

Well, then it will be interesting to see what the tip-ring voltage and loop current are while attempting to hold.  Also, what voltage and current do you see when on a call?  This failure is a little strange to me, because I'd expect the KTU to work at the end of a very long CO loop, which would also be about 20 mA.

Stewart:
I just discovered that the hold mechanism is different depending on line card type.  Which kind(s) do you have?  See http://thephonebooth.com/bsp/518-220-400.pdf .

MurrayB:
The cards are 400D.

Just for your info it is a "shoebox" style KSU manufactured in the seventies.

MurrayB:
Hi Stewart & everyone

I was just able to get back to this. Here is some data:

On Hook:

State   On Hook
LoopCurrent   0 mA
VBAT                    58 V
TipRingVoltage   45 V

On Call & hold button pushed not released same data:         

State   Off Hook
LoopCurrent   19 mA
VBAT                   17 V
TipRingVoltage   8 V

Stewart, I hope that this is what you want! What are your thoughts?

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