Geoff Posted January 16, 2012 Posted January 16, 2012 I need to move a telephone without moving the phone line. The obvious way to do this is to use a couple of RJ45/RJ12/11 adapters and use the cat5 wiring already present to move the line to where I want it. However I can't seem to find anywhere to buy the adapters! Does anyone know where I can get these? I've tried looking on CPC but their seach system is terrible. :S
featured_spectre Posted January 16, 2012 Posted January 16, 2012 PC World do them instore, but they're not cheap. Think they are ~£15 per adapter if not more.
plexer Posted January 16, 2012 Posted January 16, 2012 Re-crimp the phone lead into an rj45 I've also done that before. Ben
Geoff Posted January 16, 2012 Author Posted January 16, 2012 I'd rather use an adapter, I've tried plugging them in directly in the past and it invariably ended up in damage. As for re-crimping the cable, I can't as we don't own the equipment. Really, the simplest option is to just get an adapter.
3s-gtech Posted January 16, 2012 Posted January 16, 2012 Is this what you need eBay - The UK's Online Marketplace We already have this done in one of our offices, tidied things up a bit. 1
pete Posted January 16, 2012 Posted January 16, 2012 We used Assynia ones from CMS PLC. Can't remember the part code though.
plexer Posted January 16, 2012 Posted January 16, 2012 The last phones we got for our system came with 2 leads, one with rj45 on and the other with a normal phone lead. I use rj11/12 cables from my environment monitor and then convert them to cat5 by plugging them into a sensor that has rj45's each end so maybe just and rj45 coupler would do? Seems strange that the current wallboxes for your phones have rj11/12 sockets and not a standard BT plug. Ben
kaphc Posted January 16, 2012 Posted January 16, 2012 Is it a balun you are after? That's the term phone companies tend to use - have you tried searching under that term rather than adapter? Beware - they come in different types so if you're ordering, it might be wise to choose somewhere with a robust returns policy. From memory, it comes down to whether they are primary or secondary baluns but don't quote me on that!
steveg Posted January 16, 2012 Posted January 16, 2012 I assume it's these that you are after? Voice Converters/Line Adapters For most things you'll want the secondary ones. Steve 1
Geoff Posted January 16, 2012 Author Posted January 16, 2012 Yes indeed, if someone can explain what the differences are?
steveg Posted January 17, 2012 Posted January 17, 2012 I believe primary and pbx are largely the same thing (someone will correct me if i'm wrong) and have a capacitor between 2 of the pins, which ones I can't remember right now, I've been teaching all day! (this is the same as your master BT socket which has the capacitor in it) Secondary ones do not have this capacitor. I once made the mistake of assuming pbx ones would be the ones to use on an internal phone system, apparently not, lots of crackling on the line and generally not working, secondary ones were fine. Steve 1
Geoff Posted January 17, 2012 Author Posted January 17, 2012 Yeah, I read this on wikipedia which I think explains it: This master socket contains a high voltage surge protection[clarification needed] (SP1) to suppress high voltage spikes etc, a 1.8 µF capacitor (Bell Circuit) to feed the AC ringing and a 470 kΩ resistor (R1 Out of Service Resistor) to provide remote testing when no telephones are plugged into any sockets. Additional internal extension (secondary) sockets are wired off the master socket (connected in parallel using the IDC system) and do not contain the surge protector, bell circuit capacitor and the out-of-service resistor. British telephone sockets - Wikipedia, the free encyclopedia
plexer Posted January 17, 2012 Posted January 17, 2012 Are you going, pbx - telephone wall socket - cat5 point - structured cabling - cat5 point - phone? Ben
Geoff Posted January 17, 2012 Author Posted January 17, 2012 ATM I'm going on one line: BT Master socket -> DSL Microfilter -> Structured Cabling -> Phone. On the other line, its the same with no DSL involved.
plexer Posted January 17, 2012 Posted January 17, 2012 Ok well if you're going from a phone socket then into structured cabling you don't need any of those other adaptors you really just need to convert to cat5. I did it by, take cable with bt phone plug on and punch down onto cat5 module this then convert the bt socket to cat5 capable. Then this was patched over the structured cabling and at the other end you just need to do rj11/12 to rj45, simplest to replace the cable on the phone. Ben
Geoff Posted January 17, 2012 Author Posted January 17, 2012 The phone lines will be going into a FreePBX box at some point though.
plexer Posted January 17, 2012 Posted January 17, 2012 You only need one set of capacitors and surge aresstors though so if keeping the bt socket that's fine. In the future with the free pbx then the cabling will still go from pbx to socket of straight of cat5 to phone? Ben
Geoff Posted January 17, 2012 Author Posted January 17, 2012 I imagine I'll use SIP phone on desks, so I wont need to patch phone lines anywhere.
plexer Posted January 17, 2012 Posted January 17, 2012 Ok no worries in case just need to do what I said. Ben
Gaz Posted January 18, 2012 Posted January 18, 2012 Do you mean these Geoff? Networking & Broadband | CPC | Results 1
Gaz Posted January 18, 2012 Posted January 18, 2012 Arh, they're called Line Adapter Units ("LAU" is what I searched for)
Geoff Posted January 18, 2012 Author Posted January 18, 2012 The CPC pages helpfully explain the differences too. PSTN - - mastered with surge arrestor Secondary - - no mastering or surge arrestor PABX - - mastered without surge arrestor
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