Re: [Telecom] False Preliminary Pulse (was 11X vs. N11 Codes)

Re: [Telecom] False Preliminary Pulse (was 11X vs. N11 Codes)
NewsGroups | Search | Tools
User Password
Register Now! Lost Password?
 comp.dcom.telecom  Post an article  get this group's latest topics as an RSS feed add this group's latest topics to your My MSN content add this group's latest topics to your My Yahoo content  add this group's latest topics to your Google content  YahooMyWeb Yahoo!  Google Google  Windows Live Favorites Windows Live  del.icio.us del.icio.us  digg digg  Add to Netscape Netscape
Subject Author Date
Re: [Telecom] False Preliminary Pulse (was 11X vs. N11 Codes) Neal McLain 01-27-2008
Posted by Neal McLain on January 27, 2008, 5:36 pm
If you were  Registered and logged in, you could reply and use other advanced thread options
hancock4@bbs.cpcn.com wrote:

> There was a concern (I don't understand) the candle stick
> phones of that time would sense an erroneous pulse that
> would confuse SxS gear, thus the 11 code. Why this
> wouldn't screw up panel gear I don't know. Once 'sticks
> went away the issue was moot.

I wrote:

> It's possible to make a false preliminary pulse with any
> analog phone, not just candlesticks. A false preliminary
> pulse equates to dialing a 1 no matter what kind of
> equipment is at the other end, even ESS. As we've
> discussed on this list any number of times before, an
> experienced high school kid can dial any number by
> punching the switchhook button.

hancock4@bbs.cpcn.com then wrote:

> According to the Bell System history, the problem was
> unique to candlestick phones. Why only those phones, I
> don't know. I'll have to read up on it to get more
> details.

Let us know the details after you've read up on it.

I can understand that the physical architecture of a candlestick phone would
make
it more likely that a user could inadvertently make a false preliminary pulse.
But that doesn't preclude the possibility of making a FPP with any type of
(non-VOIP landline) phone. Electrically, any type of switching equipment
would
interpret any pulse of about 1/2 second duration as a dialed "1".

Try this: pick up your landline home phone, then press and release the
switchhook
as fast as you can. Note that dialtone goes away. You just dialed "1".

Or try dialing 215-221-1111 with the switchhook. It might be a bit tricky
dialing that "5", but if you reach Sam's Kitchen Supply, you did it
correctly.

Neal McLain


Pure Networks
Posted by Curtis R Anderson on January 28, 2008, 11:23 am
If you were  Registered and logged in, you could reply and use other advanced thread options
Neal McLain wrote:

> Try this: pick up your landline home phone, then press and release the
> switchhook
> as fast as you can. Note that dialtone goes away. You just dialed "1".
>
> Or try dialing 215-221-1111 with the switchhook. It might be a bit tricky
> dialing that "5", but if you reach Sam's Kitchen Supply, you did it
> correctly.

In the '70s, NPA 716 had 716-221-1111 assigned to the "time and
temperature" Audichron device in downtown Rochester, NY. Our running
joke in elementary school was to dial 2 twice and "hang up" five times
to get our #5XBs to load 1s into the originating register.

With the NPA split of 2001, maybe Buffalo should reassign 221-1111 for
those purposes, say, the Talking Phone Book, instead of the current
844-1111.
--
Curtis R. Anderson, Co-creator of "Gleepy the Hen", still
Only N more shopping days to Christmas! (where N is an integer)
http://www.gleepy.net/ mailto:gleepy@intelligencia.com
mailto:gleepy@gleepy.net (and others) Yahoo!: gleepythehen


Posted by Rick Blaine on January 28, 2008, 11:24 am
If you were  Registered and logged in, you could reply and use other advanced thread options

>Try this: pick up your landline home phone, then press and release the
>switchhook as fast as you can. Note that dialtone goes away. You just dialed
"1".

Back in the 70s, a friend's roommate thought he had discovered a way to make
free long distance calls by flicking the switchook. The roomies girlfirend lived
a few states away and he was on the phone for hours every night. I think it took
him a year to pay off their first phone bill.


Posted by on January 28, 2008, 11:26 am
If you were  Registered and logged in, you could reply and use other advanced thread options
> > According to the Bell System history, the problem was
> > unique to candlestick phones. Why only those phones, I
> > don't know. I'll have to read up on it to get more
> > details.
>
> Let us know the details after you've read up on it.
>

> I can understand that the physical architecture of a candlestick
> phone would make it more likely that a user could inadvertently
> make a false preliminary pulse.

There was recently something in the TCI Bulletin that confirms your
statement. Perhaps the way people held the stick in their hands or
lifted off the handset caused an extra 'flick' of the hookswitch. The
hookswitch of a 'stick' extends out as opposed to the button
hookswitch of later model sets. Maybe as the used grasped it they
flicked it. Because it sticks out, it acts as a large lever and
doesn't need much pressure to engage it. (I just checked one.) When
I used my stick phone in service I had no problem with it. (The
associated network broke, I need to get it fixed.)



> Or try dialing 215-221-1111 with the switchhook. It might be a bit tricky
> dialing that "5", but if you reach Sam's Kitchen Supply, you did it
> correctly.

"Dialing" anything more than a 2 is actually quite tricky Your hand
pressing a hookswitch is not precise enough for dial pulses. The
chance of error increases with the digits to be dialed. Even an easy
number like that can be tricky with the twos and particularly the
five.


Posted by T on January 28, 2008, 6:03 pm
If you were  Registered and logged in, you could reply and use other advanced thread options
In article <e517bbc5-21e7-4df1-85b6-098e31a2ea91
@q77g2000hsh.googlegroups.com>, hancock4@bbs.cpcn.com says...

> > Or try dialing 215-221-1111 with the switchhook. It might be a bit tricky
> > dialing that "5", but if you reach Sam's Kitchen Supply, you did it
> > correctly.
>
> "Dialing" anything more than a 2 is actually quite tricky Your hand
> pressing a hookswitch is not precise enough for dial pulses. The
> chance of error increases with the digits to be dialed. Even an easy
> number like that can be tricky with the twos and particularly the
> five.

I used to get around dial locks by doing just that, pulsing out the
number by hand.

Can still do it too! I remember one time I was in a store with a COCOT
style phone and a desk phone tied to it with no dial. I showed the owner
how to dial out on it. Too funny!




***** Moderaotor's Note *****

When I was a kid, the barber down the street had a calendar hung next
to his wall phone, which wsa an "answer only" instrument tied to the
pay phone line. If he picked up the phone and tapped that calendar, he
could make a call: it seems that someone had run wires from the ring and
ground leads to a position behind the calendar.

BTW, please put [Telecom] (The brackets are important) in your subject
line, unless you're willing to wait a few days for me to read it.

Bill Horne
Temporary Moderator


Similar ThreadsPosted
[Telecom] Re: False Preliminary Pulse (was 11X vs. N11 Codes) January 30, 2008, 11:39 am
Subscriber Pulse Metering 12/16 kHz: Pulse Ramp Time October 24, 2005, 1:13 pm
History -- why not 20 pulse/sec dials? [telecom] August 6, 2008, 8:17 pm
Re: History -- why not 20 pulse/sec dials? [telecom] August 7, 2008, 9:11 pm
Re: History -- why not 20 pulse/sec dials? [telecom] August 10, 2008, 9:18 am
Re: iPhone's false bargain [Telecom] July 5, 2008, 9:05 am
Re: [Telecom] 1+10D, was 11X and N11 Codes January 21, 2008, 7:40 am
[Telecom] Re: 1+10D, was 11X and N11 Codes January 17, 2008, 4:24 pm
[TELECOM] Re: 1+10D, was 11X and N11 Codes January 14, 2008, 9:09 pm
Re: [Telecom] 11X and N11 Codes (was 911 not universal) November 29, 2007, 4:15 pm

other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

Custom CGI Perl and PHP programming by 1-Script.com

Contact Us | Privacy Policy
The site map in XML format XML site map