Phone Systems

Previous Thread
Next Thread
New Reply
Print Thread
Rate Thread
Page 1 of 3 1 2 3
Whats the right thing to call it/what's in it? #20439 10/13/08 04:21 AM
Joined: Sep 2007
Posts: 746
Matt1964 Offline OP
Member
OP Offline
Member
Joined: Sep 2007
Posts: 746
When I was a kid I took apart a phone (probably a 500). For lack of a better term (i.e. what do you call it?) - the terminal block where all the connections join together?

Also, what is inside of that thing? And, since not all phones have it, why is it needed? I can see the need for a place to connect everything together... but that's about it.

Anyway, as I said, I took (rather tried to) take one apart when I was about 8. Pried up the tabs, but could only get it out about 1/2". Was immediately confronted with a bunch of goo, and decided maybe this isn't such a healthy thing to be getting on me. (This was the same time when rampant warnings were running around to not take apart a golf ball, as at the core was a substance that would burn, blind and cripple you).

Whats in there, why is whatever in there needed, and what's with the goo?

Thanks
Matt

Reply Quote
Refurbished Phones & Equipment Search
Re: Whats the right thing to call it/what's in it? #20440 10/13/08 05:13 AM
Joined: Apr 2006
Posts: 1,970
TexasTechnician Offline
Member
Offline
Member
Joined: Apr 2006
Posts: 1,970
It was the network. I never took one apart so I have no idea what was inside them.

I think You were a lot like me when I was a kid. I was always taking my toys apart to see what was in them. Sometimes I managed to get them back together. laugh
But it paid off I think, I scored 100 percent on the mechanical portion of the asvab test when I joined the Air Force.

Reply Quote
Re: Whats the right thing to call it/what's in it? #20441 10/13/08 05:26 AM
Joined: Sep 2007
Posts: 746
Matt1964 Offline OP
Member
OP Offline
Member
Joined: Sep 2007
Posts: 746
Thanks! Network. Easay enough to remember.


Oh yeah.. we were alike. from TV sets to radios, anything that plugged in. Used my first pair of wire cutters on a live lamp cord. That was fun. They tell me I spent most of my toddler years sticking things in receptacles.

Then there was the time I got a plug fuse cause I thought it was a really cool looking light bulb. For about 1/10000000 of a second it really was. A little bright though.

I too had mixed results on getting things back together. But I'd say I had about a 65% success rate, most times actually fixing something. It really freaked people out when a 7 year old put in a car stereo or fixed their brake lights for 'em.

I don't remember my ASVABS... They were good enough to qualify me for a lot of the more technical ratings (Navy).. but sure wasn't 100%.

Never have understood Math.

Reply Quote
Re: Whats the right thing to call it/what's in it? #20442 10/13/08 05:41 AM
Joined: Dec 2005
Posts: 6,264
Lightninghorse Offline
Moderator-Mitel, Panasonic
*****
Offline
Moderator-Mitel, Panasonic
*****
Joined: Dec 2005
Posts: 6,264
When I was a kid, starting about age 9, I got a new Timex every Christmas. It would last until about the following November. When I was about 14, I decided to investigate why my latest watch had stopped. Got the back off and, son-of-a-gun, there was an eyelash in there jamming what I later found out was the balance wheel. Sooooo, I removed it. all 3 feet of it! It was actually the broken mainspring. I just slid the mess off the side of the desk into the trash basket and got a new watch for Christmas, as usual! John C.


When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
Reply Quote
Re: Whats the right thing to call it/what's in it? #20443 10/13/08 05:44 AM
Joined: Sep 2007
Posts: 746
Matt1964 Offline OP
Member
OP Offline
Member
Joined: Sep 2007
Posts: 746
lol

John - for future reference - there's this dial on the side you have to wind from time to time. Actually, if you pull out on it.... you can even set the time!!!!

smile

Reply Quote
Re: Whats the right thing to call it/what's in it? #20444 10/13/08 01:16 PM
Joined: Jan 2005
Posts: 14,908
EV607797 Offline
Moderator-Vertical, Vodavi, 1A2, Outside Wire
*****
Offline
Moderator-Vertical, Vodavi, 1A2, Outside Wire
*****
Joined: Jan 2005
Posts: 14,908
Matt, back to your original question, yes that was an early-vintage 425 type network. Many of the terminals on the top are blind (i.e: tie points), but five of them are associated with the balancing transformer. The two wires of the phone line go in on terminals C and RR. The three wires going to the handset go to terminals B, R and GN (actually two of the handset wires end up going to terminal R. The goo was in there to basically make the network much more resistant to shock if the phone was dropped. These things were so reliable that they were riveted to the base.

All phones have some form of network, just in various configurations. Western Electric had about five different ones, some to fit inside smaller phones, etc. They eventually stopped filling them with goo in the late 1970's. ITT and Sromberg Carlson switched over to a PC-board type network around that same time. At this point, phones were becoming disposable. A network that would last a lifetime was a great idea when phones were being rented.


Ed Vaughn, MBSWWYPBX
Reply Quote
Re: Whats the right thing to call it/what's in it? #20445 10/13/08 01:27 PM
Joined: Sep 2006
Posts: 3,210
Arthur P. Bloom Offline
Member
*****
Offline
Member
*****
Joined: Sep 2006
Posts: 3,210
Matt, real phones, such as all those based upon the circuitry of the 500 set, exhibit a trait called "sidetone." It is the effect that allows you to hear your own voice at a correct level, while conversing with the person at the distant end. It can be remembered by visualizing the "side" of your head, where the handset goes.

In generic terms, the 425-type WE "network" is a hybrid coil, or transformer, and a few capacitors. You need to see an older version of a BSP that shows the actual schematic, rather than a newer BSP that just shows the block diagram.

There are no phones that do not have some electrical equivalent of a network. The goo is silicone compound. Earlier ones had some sort of black crap in them. Later ones were open-air affairs, like the 4228-series, and their guts are visible.

The hybrid is arranged so that there is just the exact amount of sidetone so that your voice is reproduced in your receiver unit at a balanced level, taking into consideration the loop length and your local loop current. If you have too much sidetone, your voice sounds loud to you, and to compensate, you will find yourself speaking too softly. The person at the other end will not be able to hear you properly. Alternatively, if you sidetone is too low, you will find yourself shouting, and the person at the other end will assume that you're either very excited, or drunk.

Seasoned repairmen, working on trunk circuits, can tell if the trunk impedance is set properly, just by listening to the sidetone of a circuit, and they can do that without even establishing a conversation. They just blow softly in the transmitter, and listen to the white noise in their receiver. Too loud or too soft = impedance problems, or equalizers set improperly.

Newer el-cheapo phones occasionally have awful sidetone problems, and an old guy like me will remark on it. Nobody listens, or cares, but we complain anyway.

sidetone


Arthur P. Bloom
"30 years of faithful service...15 years on hold"

Reply Quote
Re: Whats the right thing to call it/what's in it? #20446 10/13/08 01:42 PM
Joined: Sep 2007
Posts: 746
Matt1964 Offline OP
Member
OP Offline
Member
Joined: Sep 2007
Posts: 746
Thanks guys!

Now I understand just a little bit more of this huge puzzle.

I take it that cell phones don't have sidetone, and that's why people yell into them, as they can't hear their own voice?

And I'm glad the goo was just silicone.

Reply Quote
Re: Whats the right thing to call it/what's in it? #20447 10/13/08 01:49 PM
Joined: Dec 2002
Posts: 8,037
jeffmoss26 Offline
Member
*****
Offline
Member
*****
Joined: Dec 2002
Posts: 8,037
Arthur, how about the lack of sidetone on cellphones...


Jeff Moss

Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
Reply Quote
Re: Whats the right thing to call it/what's in it? #20448 10/13/08 01:52 PM
Joined: Dec 2005
Posts: 6,264
Lightninghorse Offline
Moderator-Mitel, Panasonic
*****
Offline
Moderator-Mitel, Panasonic
*****
Joined: Dec 2005
Posts: 6,264
"Newer el-cheapo phones occasionally have awful sidetone problems, and an old guy like me will remark on it. Nobody listens, or cares, but we complain anyway." Amen to that, Arthur. But, I'll bet some day every one of 'em will say, "what'd that old phone guy say about sidetone?" When SWB started doing away with build-out coils and making the compenation in the SLICs, they never thought about G/S trunks, I guess. At least in the 1 C.O. town I lived in, the motel calls were ok to loop start lines, but any time a Motel called a Motel, EEEEEEEEE, or HOLLOW, or well you know. Since we took care of most of the motels in town, once I realized what was going on, I requested a pad of 1-2 Db on all the trunks of the motels we dealt with. BUT, we picked up all but one of the other motels in town, cause we were the only ones that could stop the problem. smile The others hadn't been padded down yet and just enough gain to EEEEEEE, when they called 1 of 'our' motels, or each other. But all the owners talk and good as well as bad gets passed around, pretty soon all but 1 began to understand that we were 'The Best'. It does my heart good to know that when they call my old outfit, they STILL want to know if and when I'm coming back! OW, I broke my arm patting myself on the back! smile John C.


When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
Reply Quote
Page 1 of 3 1 2 3
Quick Reply

Options
HTML is disabled
UBBCode is disabled
CAPTCHA Verification



Moderated by  MooreTel, Professor Shadow, skip555 

Search

Most Recent 5 Post
Handsfree options. Cics 6.0
by mikemasson123 - 02/28/20 09:23 PM
SV9100 Trunk to Trunk Disconnect
by Johnny Luchador - 02/28/20 06:06 PM
Cabling Tester
by Commshark - 02/28/20 05:30 PM
Samsung Digital Handsets End Of Life
by Aristotelis - 02/27/20 04:14 PM
Voicemail for existing extension not working
by ImNotThePhoneGuy - 02/27/20 03:46 PM
Who's Online Now
44 registered members (Yoda, RATHER BE FISHING, Jeroen, Curlycord, nortelvoip, JBean3329, Professor Shadow, Bushmills, Johnny Luchador, telephonegunner, Mercenary Roadie, mikemasson123, jknichols, jab1780, Aristotelis, Bob3470, DD782, dexman, Pinecreekboy, nfcphoneman, Ruben, BTS01, Biztel Cuban Okie Tech, Touch Tone Tommy, www.telcom1.net, Iwatsu Guru, justbill, metelcom, pdxjim911, ImNotThePhoneGuy, Commshark, usedphones, hbiss, Coral Tech, KRRath, mongo5150, CGTech, mike b, vicbob, gelehu, levi6, MooreTel, Skunky, TelephoneSystemsDirect), 932 guests, and 46 spiders.
Key: Admin, Global Mod, Mod
Popular Topics(Views)
Forum Statistics
Forums94
Topics93,532
Posts634,686
Members49,245
Most Online5,661
May 23rd, 2018
Today's Birthdays
Alex053
Newest Members
SeyerIT, dabrownm1, Gerry Lucent, Semicus, kosta543
49245 Registered Users
Get Tech Support Now! Click the banner below
Get Tech Support Now!
EMP & Lightning Home Surge Protection
EMP - Click Here!
Top Posters(30 Days)
dexman 29
Ruben 25
pvj 17
Jeroen 16
Daniel 15
RESPONSIVE WEBSITE DEVELOPMENT
Bluewater Sailing
Become a Patron! https://www.patreon.com/bePatron?u=5256033
Buy one Get one FREE when you use PayPal at checkout! Code T28P
Yealink $39.95 Buy one Get one FREE when you use PayPal on checkout! Code T28P
EMP Shield for Commercial - Home & Vehicle
Use Coupon code SAVE - Click Here!
Servpro Ventura 24-Hour Emergency Service
Free Estimates call us now 24Hours
Contact Us | Telephone System Tech Support | Terms of Service

Sundance Communications is not affiliated with any of the above manufacturers.
©Copyright Sundance Communications 1998-2020
Trusted Partners