Phone Systems

Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
#639337 12/20/20 02:02 AM
Joined: Dec 2005
Posts: 8,862
dexman Offline OP
Spam Hunter
*****
OP Offline
Spam Hunter
*****
Joined: Dec 2005
Posts: 8,862
Going old school with this question. smile

I, vaguely, remember a topic about JK cable.

Part of the discussion, if my memory is correct, mentioned that the familiar green, red, black and yellow cable was used for Princess phones. Red/green for audio/signaling/dialing while the black/yellow was the power pair connected to the external transformer.

Was JK intended to be used to wire only a single telephone line, or, was it produced to be able to support two lines from the get-go? ponder

Due to the lack of twisting, crosstalk would be an issue for long runs.


I Love FEATURE 00
Advertising Sponsor
Joined: Dec 2007
Posts: 6,650
Likes: 3
Admin
*****
Online Thinking
Admin
*****
Joined: Dec 2007
Posts: 6,650
Likes: 3

Last edited by Professor Shadow; 12/20/20 02:48 AM.

Dean
Photographs:
https://www.instagram.com/deanwilsoncanby/
https://fstoppers.com/profile/deanwilsoncanby

Please don't confuse your "Internet Search" with my licenses, certifications and over 30 years experience.

"Thank you for calling Technical Support. If you feel you have reached this number in error, please hang up and press redial."
Joined: Dec 2005
Posts: 8,862
dexman Offline OP
Spam Hunter
*****
OP Offline
Spam Hunter
*****
Joined: Dec 2005
Posts: 8,862
Bingo! I was looking in the Cabling forum as opposed to the 1A2.

Danka Professor! bowdown


I Love FEATURE 00
Joined: Feb 2003
Posts: 348
Member
Online Content
Member
Joined: Feb 2003
Posts: 348
my earliest recollection is that the yellow was used most of the time between protector and ts to provide independent ground for party line ringing and party identification for billing purposes. jk could not accommodate the wire needs for the five conductor early trimline or princess models.


HE SEEMS TO BE SAYING SOME KIND OF WORDS
Joined: Dec 2005
Posts: 8,862
dexman Offline OP
Spam Hunter
*****
OP Offline
Spam Hunter
*****
Joined: Dec 2005
Posts: 8,862
Was the cable only three conductors? If it had four, what was the black used for? ponder


I Love FEATURE 00
Joined: May 2002
Posts: 17,597
Likes: 1
Member
****
Online Content
Member
****
Joined: May 2002
Posts: 17,597
Likes: 1
The old original station wire was 20 gauge 3 wire, it replaced the 3 wire braded wire which was originally cloth cover, than rubber, no jacket.


Retired phone dude
Joined: Dec 2005
Posts: 8,862
dexman Offline OP
Spam Hunter
*****
OP Offline
Spam Hunter
*****
Joined: Dec 2005
Posts: 8,862
I've seen the three wire braded cable. I think that I might have a few small sections stashed away in the basement. Based upon the discussions, it seems that JK wasn't intended to support two POTS lines despite having four conductors.

A while back, I had combined my church's two voice lines onto a single JK cable which ran about a total of 10 linear feet between the Verizon H-202 cabinet and the 66 block I had installed as a demarc.

After the church service ended today & the 4 or 5 people left the building, I pulled a hank of JK out of my stock and moved the second voice line over to it. I suppose such a short run between the cabinet and the 66 block wouldn't pose a crosstalk issue, but, I figured that I would separate the lines again. ponder


I Love FEATURE 00
Joined: Feb 2005
Posts: 12,310
Likes: 2
Member
***
Online Content
Member
***
Joined: Feb 2005
Posts: 12,310
Likes: 2
Because the wires are not twisted pairs it was never intended to support two POTS lines. Problem is crosstalk. That's not to say that it was never used for two lines, you can get away with it but the longer the cable the better the possibility you can have crosstalk problems. (And don't ask me how long because I have no idea.) I remember that you will hear the ringing from one line while the other is in use.

-Hal


CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
Joined: Dec 2005
Posts: 8,862
dexman Offline OP
Spam Hunter
*****
OP Offline
Spam Hunter
*****
Joined: Dec 2005
Posts: 8,862
With all of the other POTS cables being CAT3, (and not experiencing any crosstalk), I figured that I might as well separate the two lines.

Now this brings up an interesting point. The daycare that leases space from us is has two POTS lines (1 voice & 1 fax) and two DSL feeds.

It seems that New England Telephone ran both phone lines from the telephone closet to the other side of the building via one JK and the other cable just has the voice line.

The distance between the phone closet (aka my office) and the daycare's areas is, roughly, 70' to 80'. I'm surprised that, after 30+ years, that nobody from the daycare hasn't complained about fax/data bleeding onto the voice line.

Then again, they had wall phone plugged in without a DSL filter for many years. A few months ago, I grabbed an unused filter and connected it to the phone for them on a day when they were closed.


I Love FEATURE 00
Joined: Feb 2005
Posts: 12,310
Likes: 2
Member
***
Online Content
Member
***
Joined: Feb 2005
Posts: 12,310
Likes: 2
Quote
Then again, they had wall phone plugged in without a DSL filter for many years.

How the heck did the DSL work? The ringer would have killed it.

-Hal


CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
Page 1 of 2 1 2

Moderated by  Professor Shadow, Silversam 

Link Copied to Clipboard
Most Recent 5 Post
Comdial DXP Call flows
by Rocket J Tech - 04/12/21 02:59 PM
24 VS 23 Gauge
by teldata1 - 04/09/21 10:28 AM
Bell System Central Office Rotation
by dexman - 04/09/21 01:30 AM
DSX 40 built in auto attendant
by dougster - 04/07/21 03:16 PM
SVMI-2 AND SVMI-2E
by dougster - 04/06/21 11:16 PM
Popular Topics (Views)
Forum Statistics
Forums93
Topics94,342
Posts639,398
Members49,445
Most Online5,661
May 23rd, 2018
Today's Birthdays
Hossmaan
Newest Members
Rocket J Tech, Jonce, Generoso, Flashy65, dv8inpp
49,445 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 57
Ruben 17
MJonas 7
Linked Banner to your Product or Website
EMP Shield for Commercial - Home & Vehicle
Use Coupon code SAVE - Click Here!
Who's Online Now
35 members (sundance, ffej010, dougster, Touch Tone Tommy, Meyery2k, hbiss, BobRobert, Carl Navarro, FONEFXR, nortelvoip, Yoda, justbill, jeffmoss26, mongo5150, Mercenary Roadie, dude, MooreTel, JBean3329, Biztel Cuban Okie Tech, Curlycord, pvj, KRRath, Ruben, www.telcom1.net, Rocket J Tech, phonemeister, Silversam, nfcphoneman, Professor Shadow, newtecky, BalkyNY, NateBates, Iwatsu Guru, Ironhedz, Memphisribs), 454 guests, and 81 robots.
Key: Admin, Global Mod, Mod
Advertising Sponsor Spot 2
Contact Us | Telephone System Tech Support | Terms of Service

Sundance Communications is not affiliated with any of the above manufacturers.
©Copyright Sundance Communications 1998-2021
Trusted Partners