Telephone over cat5

[nvening]

Hi,

What do i need to connect a run of cat 5e which runs into a patch pannel to a bt telephone port. Is there a special cable or is there something else i need??

Thanks!

[Funkstar]

Easy.

Just get a couple of these things, one for each end. Job done

http://www.bttorj45.com/rj45tobtconverters.html

You can get them in Maplin, B&Q, RS Components, etc.

We have one at work at that solid molded straight from the RJ45 connector to the BT socket and they are all broken due to being kicked or knocked by furniture, so best getting ones with a fly lead.

[Agent]

You can just directly wire it into the telephone socket too. The tool looks like:

and they are only a few quid. All of our telephones from the master socket are CAT5

[Jay]

How many lines are you doing?

I am starting to plan our new patch panel. At the moment everytime we want to move a number we have to call Telewest out to do it at a cost of £80 + VAT. With a patch its a simple plug and unplug setup.

[Funkstar]

We only have CAT5e wiring in the office. In the cable cabinet, we have a set of patch pannels that are wired to the wall sockets, a set of patch panels wired to our PBX and a couple of 24port switches.

green patch leads go from the socket panel to the switches, white from the socket panel to the PBX panel.

So any point in the whole office can be data or phone (providing there are enough switch or PBX ports obviously)

[nvening]

thanks for the help guys, just one more question, can you just use the patch cable like this http://www.bttorj45.com/bttorj45leads.html or do you need an adaptor??

Obv at the phone end ill need an adapter.

[Funkstar]

I saw that cable and don't understand it.

if it had RJ45 at one end and RJ11 at the other it would make sense, then you can connect the phone directly to the ethernet port without using the BT plug/socket.

It's also more expensive than the adapters i linked to in my first reply. One of them at either end is what you want.

[Jay]

What is the point of that cable?

Maybe VOIP phone to standard wall jack so people can use their existing cables but upgrade to a VOIP System.

[Funkstar]

Perhaps. seems a bit convoluted that one though.

[Jay]

maybe but if you have an old PBX you have removed and all the sockets in the room are alrady there then you may as well put the VoIP PBX in the place of the old system and use the existing cables and sockets.

[runitdirect]

thanks for the help guys, just one more question, can you just use the patch cable like this or do you need an adaptor??

Obv at the phone end ill need an adapter.

Those leads are designed to plug into the BT socket of the line you want to patch over your CAT5/CAT6 cabling, at the other end you would use a PABX converter to convert the RJ45 socket to a standard BT telephone socket. We also do various kits should you wish to patch one line to multiple network points.

Hope this clears that up.

[runitdirect]

I saw that cable and don't understand it.

if it had RJ45 at one end and RJ11 at the other it would make sense, then you can connect the phone directly to the ethernet port without using the BT plug/socket.

It's also more expensive than the adapters i linked to in my first reply. One of them at either end is what you want.

That would depend on the phone being used, most phones require the ring capacitor hence the need for the PABX converter.

[CrazyMonkey]

You can just directly wire it into the telephone socket too. The tool looks like:

and they are only a few quid. All of our telephones from the master socket are CAT5

Seconded - Using a similar device in my house.

[Jay]

its called a punch down tool

[peterb]

What is the point of that cable?

Maybe VOIP phone to standard wall jack so people can use their existing cables but upgrade to a VOIP System.

This has been partially answered - but in structured cabling systems using 8 core Cat 5 (4 pairs) using a wiring standard such as 568B all pairs are terminated at an RJ45 socket. Two pairs are for data (ethernet) leaving the other two pairs for analogue telecoms. An adaptor like this should have the BT plug connected to the RJ45 socket analogue phone pair. However you need the right cable for the cabling standatd (568A for example assigns different pairs for different fubctions.

Other adaptors have an RJ45 plug and go to a breakout box with a BT socket on the end so that a standatrd telephone can be plugged in. Although some older style telephones need a ring capacitor, most new ones with high impedance or electronic ringers do not (contrary to Wikipaedia!! ) but the breakout box type can incorportae these if required. Structured cabling systems do not incorporate provision for a ringing line (a 3 wire system) so if required, it has to be provided locally to the telephone.

[runitdirect]

The difference between 568A and 568B is two pairs are swapped over. The pair normally used for analogue phones is unchanged. Two pairs are only required for 10/100 but for gigabit speeds all four pairs are used. It is normal practice to run enough RJ45 outlets for phones AND data so ports are NOT shared for both, although this can be done. It makes no difference what wiring standard is used for the network at the cable above uses one pair only and if used in the kit form is supplied with the correct RJ45 to BT converter to supply the ring pin for older phones.