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258 posts

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# 165661 16-Feb-2015 17:07
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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
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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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  # 1240232 16-Feb-2015 17:35
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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.

 
 
 
 


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  # 1240245 16-Feb-2015 17:39
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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

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  # 1240257 16-Feb-2015 17:55
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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

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  # 1240326 16-Feb-2015 19:45
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They both have one thing in common .....
They look like home handyman jobs ;-)


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  # 1240348 16-Feb-2015 20:05
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Top one is slave (/secondary).  2nd is master.  The Master one should have an M on the flap.

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  # 1240354 16-Feb-2015 20:12
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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.




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  # 1240360 16-Feb-2015 20:16
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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

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  # 1240401 16-Feb-2015 20:56
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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




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  # 1240403 16-Feb-2015 20:58
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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.

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  # 1240416 16-Feb-2015 21:14
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Also has anyone ever seen a "ringing adapter" in the wild?




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  # 1240425 16-Feb-2015 21:24
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They have existed. ADSL filters didn't pass through the capacitor. OTOH telephones have had their own capacitors for over 10 years.

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  # 1240500 17-Feb-2015 05:59
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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

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  # 1240560 17-Feb-2015 09:26
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They're both 2wire but the one with the cap is still a master.

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  # 1240571 17-Feb-2015 09:36
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They both have caps.

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