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RJ11 cable query

to12ny — Wed, 19 Feb 2025 14:25:05 GMT

I am connecting an

Open Reach Mk 4 double Master Socket 5C

to a new BT Smart Hub 2

using an RJ11 to RJ11 ADSL 2+ cable, which has 4 gold pins

This works intermittently.

My old cable, which has 2 gold pins, works every time,

even though one of the plastic holding clips is broken.

The supplier of the cable says that it may a compatibility issue?

BT are sending me a new cable, but could not explain why my new cable would not work properly.

Anybody care to offer an explanation.

Thanks.

Tony

Re: RJ11 cable query

licquorice — Wed, 19 Feb 2025 17:14:46 GMT

I could understand if the cable didn't work at all as there are 2 versions of RJ11 cable, straight and crossover, but not intermittently faulty.

Re: RJ11 cable query

WSH — Wed, 19 Feb 2025 18:20:37 GMT

As Licquorice said, there have been instances in the past where 4 core RJ11’s don’t work at all with some (old) equipment, but for it to work intermittently is another issue. Couple of suggestions:

Have a close look at the plug pins on both ends see if there is any crud on them. It can happen that a bit of muck makes for a poor contact.
The RJ11 socket on the Mk4 is actually one of those that can take both an RJ45 or an RJ11. This sometimes makes the RJ11 a bit of a loose fit, so if it’s knocked it might be losing contact.