Whats the difference between these two telephone ports?

Forums › Home Workshop DIY › Whats the difference between these two telephone ports?

gished

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#165661 16-Feb-2015 17:07

I noticed my sons room had a transparent phone socket when I took the front faceplate off. Took it out and it looked different to what I'm used to seeing

What I expected to see is this:

Is there any difference or relevance to the different sockets?

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#1240226 16-Feb-2015 17:32

Just a more compact design and I think modular allowing the face plate to be used for different applications rather than as in the lower pic the face plate and socket are one piece.

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gished

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#1240232 16-Feb-2015 17:35

Thanks.

I thought it may have been the case. The house was built about 12 years ago so I'm a bit puzzled why they used the transparent socket in only one room.

richms

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#1240245 16-Feb-2015 17:39

Those are way more expensive than the all in one plates, so I guess it would be a case of what was in the van.

Richard rich.ms

InstallerUFB

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#1240257 16-Feb-2015 17:55

gished: Thanks.

I thought it may have been the case. The house was built about 12 years ago so I'm a bit puzzled why they used the transparent socket in only one room.

the top one is a single mech PDL faceplate with a BT Jkpt mech insurt ( there are multipule inserts available for differnt aplications, including adaptors for keystone RJ45 sockets ) - I suspect that this one might have been part of the original set up and the 'convertional' all-in-one was installed later as a replacement (for along time this was all 'telecom' used for spares - in reality there is no 'electrical' difference

Brunzy

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#1240326 16-Feb-2015 19:45

They both have one thing in common .....
They look like home handyman jobs ;-)

MadEngineer

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#1240348 16-Feb-2015 20:05

Top one is slave (/secondary). 2nd is master. The Master one should have an M on the flap.

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richms

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#1240354 16-Feb-2015 20:12

MadEngineer: Top one is slave (/secondary). 2nd is master. The Master one should have an M on the flap.

So wrong.

Both are 2 wire sockets.

Richard rich.ms

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MadEngineer

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#1240360 16-Feb-2015 20:16

Really?

"PTC 226 Telecom “2-wire” 2 contact jackpoints To differentiate these latest versions from previous types, they are being referred to as “2C” (two contact) jackpoints. These latest “2C” versions drop the requirement for an integral 1 microfarad ringing capacitor and now incorporate a BT socket with only 2 contact springs in place of the usual six. These are marked "2C" (2 inside a C). These Telecom “2-wire” 2 contact jackpoints are compatible with the great majority of customer premises equipment now in service. While they are connected by means of a BT type mating plug, they no longer provide ringing current for any older 3-wire connected telephones remaining in service. In the relatively few cases where such telephones are connected via these new jackpoints, a simple plug-in ringing adapter will be needed. "

"Master" or "M" marked sockets have that capacitor, some even have the spark gap protection device (small gas tube) built in

You're not on Atlantis anymore, Duncan Idaho.

richms

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#1240401 16-Feb-2015 20:56

You can see they both have a capacitor in them so are previous 2 wire ones before the 2C ones.

Master ones would not allow the wires to be punched down in seperate slots, instead doing that aweful practice of jamming 2 wires in one slot

Richard rich.ms

Bung

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#1240403 16-Feb-2015 20:58

MadEngineer: Really?

"Master" or "M" marked sockets have that capacitor, some even have the spark gap protection device (small gas tube) built in

Really. The old masters also had a test resistor and more importantly had each Krone slot connected to its own corresponding socket contact. 2W sockets paralleled krone slots to 2 contacts only.

richms

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#1240416 16-Feb-2015 21:14

Also has anyone ever seen a "ringing adapter" in the wild?

Richard rich.ms

Bung

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#1240425 16-Feb-2015 21:24

They have existed. ADSL filters didn't pass through the capacitor. OTOH telephones have had their own capacitors for over 10 years.

InstallerUFB

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#1240500 17-Feb-2015 05:59

richms: Also has anyone ever seen a "ringing adapter" in the wild?

yep - I have supplied them to a few - shall we say older aged people - when some helpfull person has changed the house wireing to two wire working and replaced all the jkpts but hasnt considered that they had x-postoffice/telecom phones (in perfect working order) that required the ringing circuit

MadEngineer

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#1240560 17-Feb-2015 09:26

They're both 2wire but the one with the cap is still a master.

You're not on Atlantis anymore, Duncan Idaho.

Brunzy

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#1240571 17-Feb-2015 09:36

They both have caps.

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