|
Joined: May 2005
Posts: 100
Member
|
Member
Joined: May 2005
Posts: 100 |
Does anyone know why keysets come with a socket for a lamp on the hold button? Would this be for a message waiting lamp or some other kind of hotline? One of my phones has a neon lamp there and it was interesting to think what was it used for. Feel good though, i rewired 4 line cords that someone else cut off. Also does anyone know why a 2568 set has a relay in it and exclusion?
You can always tell when something is old if it says "Made in USA"
|
|
|
Visit Atcom to get started with your new business VoIP phone system ASAP
Turn up is quick, painless, and can often be done same day.
Let us show you how to do VoIP right, resulting in crystal clear call quality and easy-to-use features that make everyone happy!
Proudly serving Canada from coast to coast.
|
|
|
Joined: Mar 2001
Posts: 3,869
Member
|
Member
Joined: Mar 2001
Posts: 3,869 |
You could send ringing voltage to the hold lamp to indicate most anything like "Bring more hot coffee."
That was a class project I did back in 84. The "boss" would not want people listening in to his calls so dial tone would come from the tip and ring pair to his set and then back through the card to everyone elses phone. When he lifted the white plunger, that cut off that dial tone to everyone else and he could speak knowing that no one was listening on his call.
I finished that project early and as the instructer thought I was a smart ass, he said, "Well wire this phone to exclude that phone to exclude the rest. There's no print (diagram) for that smarty pants." I came in the next morning and wired it correctly much to his consternation. "Go read your newspaper and stay out of here." It was always fun pushing his buttons by doing something he thought you couldn't do.
THE Bracha, old blond specialist in Rube Goldberg solutions.
|
|
|
|
Joined: May 2002
Posts: 17,742 Likes: 34
Member
|
Member
Joined: May 2002
Posts: 17,742 Likes: 34 |
You couldn't use ringing voltage on a 51a lamp and I don't remember using the hold button for that, even though there were/are lamps that would handle the ringing voltage. Seems to me it was used for exclusion, so everyone else knew that line was in use and excluded. There were a couple ways to do exclusion, one as Bunnie said where you pulled up the switch hook and excluded all other phones, the other phones were wired through the phone with the exclusion button as Bunnie said. There were also exclusion packs for the key system so you could have multiple phones with the feature and simply had to go off hook. I wish I could find my old 1a2 books, I'd look it up for ya. I'm sure someone on this board still has a set laying around, mine are ????? Somewhere?
Retired phone dude
|
|
|
|
Joined: Aug 2004
Posts: 9,172 Likes: 22
Admin
|
Admin
Joined: Aug 2004
Posts: 9,172 Likes: 22 |
We always used the socket under the hold button to store a spare 10volt lamp so when when running trouble tickets for dead lamps we also had spares at every phone. We always used the pull up plunger for exclusion. Did manage to unscrew the keeper machanism on one position so it wouldn't stay locked down and every time it was depressed it would light the lamp and give an audible buzz on several sets. It was kind of a "come see me button".
|
|
|
|
Joined: Jan 2005
Posts: 15,395 Likes: 17
Moderator-Vertical, Vodavi, 1A2, Outside Wire
|
Moderator-Vertical, Vodavi, 1A2, Outside Wire
Joined: Jan 2005
Posts: 15,395 Likes: 17 |
There were two formal uses for the hold button lamp that I recall. One was for a simple message waiting function which was operated by a manual key (switch) at another station. The second was for the exclusion function (white plunger button). My father's office had all 6-button sets and they wanted to add another line. All of the buttons were in use, so the Bell guys put the new line in the last button in place of intercom. To make an intercom call, they lifted the white plunger which gave them access to the intercom and the hold button was their intercom light. Seemed to me that it was an awful lot of work to avoid changing out the 25 sets to 10-button!
Ed Vaughn, MBSWWYPBX
|
|
|
|
Joined: Jul 2003
Posts: 766
Member
|
Member
Joined: Jul 2003
Posts: 766 |
We used at one instance to light when a back door was open in an office.
|
|
|
|
Joined: Oct 2004
Posts: 376
Member
|
Member
Joined: Oct 2004
Posts: 376 |
It was also used for a individual busy lamp eg. the bosses phone would lite up on the secretarys hold button when he was on a line
|
|
|
|
Joined: Mar 2001
Posts: 3,869
Member
|
Member
Joined: Mar 2001
Posts: 3,869 |
If the bulb was a neon, they work on ring generator, and any use could be assigned to them, lighted from a switch or lighted from ringing.
You obviously could put a 10 volt bulb in there, but the poster specified a neon bulb so 10 AC volts or 24 VDC would not light that up.
Remember I know these things because I am OLD as it says below. OLD, as in when 1A2 was what most everyone had and if you were young then you are now OLD. I wish we had colors so I could put OLD in red.
THE Bracha, old blond specialist in Rube Goldberg solutions.
|
|
|
|
Joined: May 2005
Posts: 100
Member
|
Member
Joined: May 2005
Posts: 100 |
OK so it means that when you get good at 1a2 you're old? LOL? I am really impressed that you guys can really remember this stuff! There's a remote exclusion circuit, wouldn't a relay be sufficient? It does seem odd to run the exclusion by routing tip and ring through one phone. Wouldn't it be better to just ground a wire at the set and control another relay? I am thinking of conencting the neon lamp to the main line of that set, and it comes from an Asterisk PBX and an ata, which has the message waiting function.
You can always tell when something is old if it says "Made in USA"
|
|
|
|
Joined: Jan 2005
Posts: 15,395 Likes: 17
Moderator-Vertical, Vodavi, 1A2, Outside Wire
|
Moderator-Vertical, Vodavi, 1A2, Outside Wire
Joined: Jan 2005
Posts: 15,395 Likes: 17 |
Yes, Rotary you could use a remote relay for exclusion, but remember that this stuff dates back to the Bell System days when it wasn't all driven by cost savings. It was also about quality and maybe that was the reason for wiring exclusion keys that way. They did it both ways, depending on the size of the job. If it was a simple one-station controlling all other stations, I guess it was easier to just do it through the set.
I think you are going to be hard-pressed to find a neon bulb that fits in a 51A lamp socket though. The switchboard neon bulbs were much longer in lentgh, about 1.5" as opposed to the 3/4" standard keyset bulbs.
Ed Vaughn, MBSWWYPBX
|
|
|
Forums84
Topics94,512
Posts639,934
Members49,844
|
Most Online5,661 May 23rd, 2018
|
|
1 members (justbill),
120
guests, and
41
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
|
|