Cabling from outside to master socket

Hello everyone. Compliments of the season to you and Happy New Year! Attached to the front of my house is a black box (sort of sausage shaped, approximately 5 inches in length) and from this is a white cable which goes through the wall at the front of the house, into my loft, is stapled to the rafters and then drops down into my room and attaches straight to the master socket (NTE5a), which is the only socket in the property. The white cable is thin and has four cores - BLUE, BROWN, GREEN and ORANGE. As the attenuation on my line is quite high for my distance from the cabinet (I'm on FTTC) I was wondering if this is the correct cable and if it being stapled to the rafters would affect it at all. Should it be an external wire coming into my house? What is the most up-to-date wiring colours? Just trying to tweak wherever possible before my fibre is upgraded to the 80/20 package. Many thanks for reading.

Not your cable to fiddle with, and changing just a metre or two is not going to affect the attenuation to any great extent

Good pictures might let someone identify whether genuine cable or a previous residents DIY bodge

It's not so much as what colours are right as what pairs are right. There are numerous colour codes out there and indeed marking codes from times before man could make coloured wires.

MrSaffron and partial - thanks for your quick responses. If the cable turns out to be rubbish I shall ask BT to replace.

Am I right in thinking the pair connected in the box outside my house on the wall need to match the pair connected to A and B in the master socket then? Thanks again.

The pairs don't need to match, so long as pair is used rather than being a split pair

Thanks MrSaffron. Just letting the OCD get the better of me. Sounds like no point in replacing it then! Just thought attenuation of 19.1db was quite high to say I'm 300 metres from the cabinet is all.

Just stripped back the white outer sheath and the cores aren't twisted. Is this correct? Thanks and apologies for more questions. I have previously trimmed back cable on a master socket and used an idc tool to remake the connections and saw the attenuation drop a little! 🙂

In reply to a post by giggsy1977:

Just stripped back the white outer sheath and the cores aren't twisted. Is this correct? Thanks and apologies for more questions. I have previously trimmed back cable on a master socket and used an idc tool to remake the connections and saw the attenuation drop a little! 🙂

Firstly, not your cable to be stripping back, secondly how are you totally sure it is not twisted? Cabling is not always obviously twisted.

The black box is likely just a BT approved joint enclosure such as this snapped and closed:
https://www.picclickimg.com/00/s/OTAwWDE2MDA=/z/xdMA...

It is standard to use internal vs external cabling, one white and one black. Drop cable would not typically be used internally, it will often run outside, drill through the wall and straight into the master. If there's internal wiring, it should be white as yours is.

As a reference I have an attenuation of 13.9 and my green FTTC cab is less than 50m away. It all depends how the cabling is routed.

Third point, you state you are upgrading to 80/20, although based on your signature "Predicted speed 54.7Mbps down/15.7Mbps up. Actual speed 42Mbps down/4.5Mbps up" indicates you already had an 80/20 package on BT?

Note, DLM is the same on Sky and BT, so in theory your speeds could end up the same as with BT. Based on the noise margin of 13.1 in your signature, you know it is extremely unlikely you will get 80 down right? I would suggest 50 to 60 is likely, depending how the line stabilises.

Your link to a pic doesn�t work for me. Just a blank screen.

When I read the OP I thought of the waterproof jointers?

In reply to a post by RobertoS:

Your link to a pic doesn�t work for me. Just a blank screen.

When I read the OP I thought of the waterproof jointers?

that's what I had linked too - I will amend the link when I get on a PC.