Hayes: glitches with pulse dialing... — ZXNet «real.speccy»

From Felix Knajzev To All 31 May 1999

Greetings, oh venerable Musa!

[Friday May 28, 1999] at [09:49:39] Musa Khaybullin wrote a letter to Oleg
Pritula.
They discussed the topic "New text editor for Spectrumists".
Let's continue what we started...

OP>> 2All: None of the real-life people had any problems with
OP>> connection and
OP>> Acorp 33.6 running? The tables are as follows: when dialing
OP>> numbers in
OP>> pulse mode, at an arbitrary moment of dialing
OP>> next
OP>> digits
OP>> the DCD indicator lights up and the modem hangs up. And so

In fact, he does ATZ, at least that’s what he did for me. You can
check this yourself.
If you have &C1 in your active profile, then perhaps it
does AT&F for you.
IMHO, this happens due to the presence of a certain self-diagnosis system when dialing
numbers: if the modem “feels” that
it is dialing “something wrong” (control can be carried out through the modem
receiver), then it (the modem) is in good faith restarts, thereby
preserving the healthy sleep of innocent citizens. 8-)

OP>> constantly. Not
OP>> was able to dial the number completely. Moreover, Long Shain
OP>> 2400
OP>> works without problems. What could be the matter here? HELP!!!
MK> I have the same problem, but only
MK> sometimes, with the modemRocwell 14400. The bastard picks up and hangs up
MK> during pulse dialing, some time passes
MK> and he wakes up, after which he starts dialing
MK> the number again. And it dials normally!

Problem 1:1, just like I had. Modem LTI-9624HV-B (2400/MNP/V42BIS).
The culprit is the dial relay. The reason is “sticking” or burning of the reed switch contacts inside the relay. A simple check: give the modem
ATX3 and set it to auto-dial when the phone is _disabled_. lines. If
it never freezes, the reason is 100% in the relay.
How to treat:

1. Replace the relay: find a relay specifically for the modem or install a domestic analogue, for example, from the RES-55 or RES-64 series. If you have to install “our” relay (only a reed switch!), then you need to pay attention to two of its
characteristics: operating voltage (5V), winding resistance to DC >= 500 Ohms. The last parameter is very
important, because In most more or less modern modems, the key (transistor) for controlling the relay is located inside some healthy “cockroach”. If it burns out due to
too high load current, then you can be left without any pulse dialing at all...

2. Install an electronic analogue of the relay (the role of the switching element is performed by an optocoupler. There is a circuit for USR, but, IMHO, it can be suitable for any modem.).

3. Do it yourselfreed relay. ;-) If the hands are of the correct
configuration ;), then it is done in 1 hour. Works very
reliably.

4. You can try to disassemble the “original” relay and replace only the reed switch in it. But there are two possible problems here: the internal cavity
of the relay can be filled with epoxy feces (my case. The reed switch
could not be pulled out without destroying the coil) and the lack of a suitable reed switch in size (bulb diameter). Miniature reed switches
can be taken from keyboards made on them.

For myself, I used the 3rd option. If you need a “technology”
of production, then I can share...

Sincerely, Felix.

[I ZX]

From Dmitry Lomov To All 1 June 1999

Hello, Felix!

Once, Mon May 31 1999 15:01, Felix Knajzev wrote to Musa Khaybullin about
[Hayes: glitches with pulse dialing...]:

FK> 4. You can try to disassemble the “native” relay and replace only the reed switch in it
FK>.

tell me, what kind of angel does it rattle like that, if it reed switch? IMHO, the contacts there
are simple + solenoid :-) why then change to Soviet reed relays? Are the reed switches quieter there? ;)

All the best.
Dmitry.

..LD..X-TRADE.. [ZX]

From Kirill Frolov To All 3 June 1999

DL> tell me, why the angel does it rattle so much if it is a reed switch? IMHO,
DL> the contacts are simple + solenoid :-) why then change to Soviet
DL> reed relays? Are the reed switches quieter there? ;)

The relay there is a reed switch - hold up a magnet and make sure.
And the Soviet one rattles even louder. RES-55 is very loud. Type in a tone and don't
suffer.

Kirill Frolov. [ZX]

From Felix Knajzev To All 3 June 1999

You have? :) I don't know. :) Maybe you are mistaking “clicks” from the speaker built into the modem when dialing a number for increased relay noise? Set ATM0 (the speaker is always off) and check it like this.
For me, the very relay that eventually “crashed” was working quite noisily (this is not a guide to “action”! :). And on the old 2400/none
the relay was not
audible at all, you have to listen for a very long time.

DL> IMHO, the contacts there are simple + solenoid :-) why then
DL> are they changing to Soviet reed relays? Are the reed switches there quieter?
DL> ;)

They change, IMHO, only for two reasons - complete breakdown or unsatisfactory
work (subject).

From Dmitry Lomov To All 5 June 1999

FK> They change, IMHO, only for two reasons - complete breakdown or
FK> unsatisfactory work (subject).

no. do you read business? there regularly pops up the sentence “I’m changing
the loud-fucking relay to a gentle-soporific one.”

From Oleg Pritula To All 5 June 1999

Bah! Who do I see! Felix, is that you?!

On Thursday, June 3, 1999 at 13:29:00, Felix Knajzev pressed the beeps for Dmitry Lomov
about "Hayes: glitches with pulse dialing...":

FK> -+- LC_v4.30

Das ist fantastish!

FK> + Origin: REALLY on REAL! (2:5030/827.9)

...REAL Lara 4.30 for REAL people!

P.S. Isn’t it a shame to mock people? ;(

\\|// ╟─┤asta la vista !!! Curator from the prefecture:
o(@ @)o -=POWer/WDG/AF=-
-----ooO-(_)-Ooo----- √E-Mail: w...@hello.to