98 lines
3.5 KiB
Plaintext
98 lines
3.5 KiB
Plaintext
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Type P to Pause, S to Stop listing
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Project Verify
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by Fred Steinbeck
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I did some more research, and found that
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RING FWD doesn't send 90V out on the forward
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part of the loop. Instead, it disconnects the
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forward part of the loop from the position for
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a short period of time (less than 0.5 seconds).
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On an overseas call, this would make the inward
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operator's CLG light flash on and off, signaling
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her to stop doing her nails and get on with the
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call.
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What this does to verify circuitry is
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anyone's guess. If the connection is long
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distance, the winking of the TSPS console
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would send 2600 Hz momentarily at the verify
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circuitry, which might be a possibility...
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Anyway, operators generally don't use
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routing codes anymore, except in a few
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areas (I wish I knew of a few of them). Now
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what an operator does to verify or interrupt
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is the following:
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Assume you have dialed 0+7D, and the 7D
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is the number you want verified. The operator
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then classes charge as "station paid" and hits
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VFY. If VFY lights, it means the number can
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be verified. She then presses HOLD on loop 1,
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and ACS (access) on loop 2. She then presses
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ST, which completes the verify call. If there
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is speech on the line, she will hear encrypted
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speech. Assuming so, she then hits EMER INT
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(emergency interrupt), tells them what's going
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on, and then hits REL FWD (release forward,
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which drops the call on loop 2). She then
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hits POS REL on loop 2, and ACS on loop 1,
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bringing her back to you. She then reports,
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hits REC MSG (record message, which charges
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you) and then POS REL, position release.
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Most areas no longer have "TSPS Maintenance
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Engineers" or frame calling the operator.
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However, if you do, you might waht to try this.
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"Operator, class charge as station paid, and hit
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verify plus start. Now hit emergency interrupt,
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no AMA, and postion release." This should have
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the effect of throwing you into the call as a
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3rd party, for free. I wouldn't do this from
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home, however, because when you call the
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operator, you are not free of her until she
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position releases. Therefore, if she gets
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suspicious, you can hang up, but it won't do
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you any good...
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Paraphernalia
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B & F Enterprises (P.O. Box 3357, Peabody, MA
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01960), says Agent NDS, sells a "telephone loop
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pickup coil", for $4.88. I would assume it is
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much like the Trinetics PC-48 inductive coupler.
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I have not checked this place out, but it would
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seem to be a good deal.
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Bay Technologies-(408)-737-8180 sells the
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NSC 800 series of microprocessors and support
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devices. To find a supplier closer to you,
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try calling National Semiconductor at (408)-
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737-5000, and ask for your local distributor.
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American Microsystems, Inc. (AMI) produces
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what they call the "Telecommunications Design
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Manual". This fine book, which is actually
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a combination of AMI semiconductors, circuit
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layouts, schematics, articles, and an informative
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glossary, can be had for the price of a call
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to (408)-246-0330.
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Bell System locks are a special brand: BEST.
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They are what they claim to be. I have never met
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a person who could pick them. What to do? Take
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a hacksaw to the lock from the top and cut the
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doorknob off. Then throw the bolt with a
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screwdriver. It takes about 20 minutes, but
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it can be worth it.
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Type Selection or M for list,
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P to set protocol, <CR> to exit:
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