In reply to a post by David_W:

I was wondering last night if a PoE splitter like the TP-LINK TL-POE10R would bring in sufficient power over the Ethernet cable to the modem. If you were to try this, you'd need the other end of the Ethernet cable connected to an 802.3af power source, either a PoE capable switch or midspan injector like the TP-LINK TL-POE150S.

It's a shame that the BT Openreach supplied FTTC modems don't support 802.3af powering without a splitter. If they did, this would allow them to be powered from a router with a WAN port that can act as an 802.3af power source.

That would be 100Mbps ethernet which would be sufficient for 80Mbps vdsl?

In reply to a post by MrSaffron:

Brain is full of PAC report today, but you can run 100 Mbps Ethernet and use a spare pair (is it centre pair) for carrying the PSTN side too, unless memory has totally fried that is.

Yeap quick check 100Base-TX can run over two pairs.

http://www.clarity.it/xcart/product.php?productid=16... is 2 pairs only though, so using a supplied "data extension" kit may not give one the required spare pair for filtered voice?

In reply to a post by MrSaffron:

you can run 100 Mbps Ethernet and use a spare pair (is it centre pair) for carrying the PSTN side too, unless memory has totally fried that is.

Yeap quick check 100Base-TX can run over two pairs.

It was the long obsolete 100Base-T4 that needed all four pairs for 100Mbit/s Ethernet. This was rarely seen, even in the day - the only advantage was that it worked with Category 3 cable.

100Base-TX, which is specified for Category 5 cable and up, uses the same two pairs as 10Base-T - 1/2 and 3/6. This leaves 4/5 and 7/8 unused.

1000Base-T and 10GBase-T use all four pairs.

In reply to a post by 4M2:

In reply to a post by David_W:

I was wondering last night if a PoE splitter like the TP-LINK TL-POE10R would bring in sufficient power over the Ethernet cable to the modem. If you were to try this, you'd need the other end of the Ethernet cable connected to an 802.3af power source, either a PoE capable switch or midspan injector like the TP-LINK TL-POE150S.

That would be 100Mbps ethernet which would be sufficient for 80Mbps vdsl?

Almost all modern 802.3af kit, including those TP-LINK boxes, supports Gigabit Ethernet. Old 802.3af midspan kit may only pass two pairs, so is limited to 100Base-TX.

In any event, the BT Openreach VDSL2 modems only have 100Base-TX network ports.

Thanks for the info, I've no experience of power over ethernet and assumed that might limit the data rate to 100Mbps even when using 4 pair CAT5

True, so down to the person buying the kits to make the right buying decision.

Based on what I've been hearing and reading all day, I suspect 99% of people will have got bored of this conversation and also have no idea what we are talking about.

I am one of those people! There's a 30m run of CW1308 Telephone Cable (4 pairs) which takes filtered voice and straight vDSL from the Master to the location of the telephone and data ports where the Phone, BT Modem, my Fibre Router and Telephone socket are located.

Never had any problems, but do benefit from being less than 200m from the cabinet, so have a strong Fibre connection (73Mb down/18Mb up).

Andrew

Edited by deleted (Fri 27-Sep-13 10:31:22)

May I ask what filtered facepate are you using on the NTE5?

It's a brand new BT faceplate, the type that stacks on top of your existing faceplate and has a cutout in the bottom so that the engineer does not need to disconnect any extensions you have on the socket.

The faceplate is a filter which splits the phone signal as it comes into your house into VDSL2 and regular phone. It presents you with an RJ11 socket at the top for VDSL2 and a standard BT 431A phone connector at the bottom.

This is not mine, but it looks like this

In reply to a post by atsw:

The faceplate is a filter which splits the phone signal as it comes into your house into VDSL2 and regular phone. It presents you with an RJ11 socket at the top for VDSL2 and a standard BT 431A phone connector at the bottom.

This is not mine, but it looks like this

MrSaffron's site has a good description and tear down of the NTE5 / interstitial filter / faceplate stack used for FTTC.