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  Reply # 651684 6-Jul-2012 09:38 Send private message

What's the deal/risk on shorting the incoming pairs together?
ie does this blow something back at the exchange or are they geared up for that eventuality?

Meaning, should we be mentioning ensuring that this doesn't happen by doing one at a time etc?

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  Reply # 651688 6-Jul-2012 09:42 Send private message

Hi, shorting the pairs simply will loop the line (ie go off hook) the exchange has current limiting in the line card so shorting the line is not an issue, but watch it when you unshort it, you can get a belt from the back emf as inductors in the line card in combination with the 1-3km of line react.

If you dont have large or 3port scotch locs then reterminating the black twin pair can be a bit of an issue, so maybe leave the red/white 0.4mm tails in place at least.

Cyril

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  Reply # 651705 6-Jul-2012 09:48 Send private message

cyril7: Hi, shorting the pairs simply will loop the line (ie go off hook) the exchange has current limiting in the line card so shorting the line is not an issue, but watch it when you unshort it, you can get a belt from the back emf as inductors in the line card in combination with the 1-3km of line react.
Cyril


Thanks!

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  Reply # 651714 6-Jul-2012 10:02 Send private message

Good answers thanks, making sense (except maybe the shorting, I gather I can't bugger it up easily though). Just have to read back on how to crimp and try sort it out tonight or over the weekend.

Currently using that jack for modem, but "would be nice" to have the option of the other ones. Have swapped the cable to ditch the filter too like you said Cyril.


I think that's the crux of the wiring/speed issue? Technicians don't want to argue against indecisive end users that "might want to move the modem later".
Can I sum it up in layman's terms saying that: "Multiple modem points dilutes speed, so, if you want the best speed choose a point stick with it or moving it after will require rewiring"?

Obviously for more technically inclined people speed should never unknowingly be compromised for flexibility!

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  Reply # 651723 6-Jul-2012 10:16 Send private message

You can opt for a downstream outlet to be your dedicated modem line, but you do need to investigate how your phone cabling is run. It's not uncommon for outlets to be daisy chained in multiple 'hops' between outlets. The risk then is that the one you chose also carries on to others downstream, giving you the multiple legs reflection issues talked about earlier. Hope that makes some sense!

Ideally yes, you want to identify one outlet that will become your sole ADSL enabled outlet, into which you connect your modem. Flexibility wise this isn't always easy to change at a later date. In many installs you end up running a new cable to the dedicated modem location, with all the joys of crawling around to pull and lay the new cable.

It's all a bit of compromise really, do you want a clean line to the modem, or do you want to be able to move the modem to multiple locations from time to time.

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  Reply # 651730 6-Jul-2012 10:27 Send private message

Hi, that is correct, the optimal solution is to have the inbound line go to only one socket with no branch's. However if there is pots on the line as well and it is to go to other outlets then a master filter must intercept the inbound line at any location before the line splits or branches, and from the filter go direclty to a single modem socket, and the voice go to as many sockets wired however suits.

Cyril

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  Reply # 651735 6-Jul-2012 10:37 Send private message

The original split line for the modem went to the back bedroom, perhaps a study at the time. We didn't want it there, so the fella instead of making me choose somewhere else, whipped out the splitter (or filter? which is the correct term? both?).

I am happy to use the master jack where it is, but just around the corner is a daisy chained jack where our TV resides. I'm planning on doing some HTPC/NAS experimentation and setup which may or may not benefit from bringing the modem round closer to the TV.
As it stands it is only about 1.5M round the corner so the single LAN out of the modem reaches my Xbox anyway, but 2 or 3 cables would start to get messy.

The thing that concerns me more is making sure I can leave the wiring in a state that satisfies the landlord/subsequent tenants if we move.

If I can, I would like to disconnect the far off bedroom line and the daisy chained one round the corner. If I need it, reconnect the daisy chained one (not using the master because it isn't the last in chain, right? ;) I'm confident there are no other jacks because it is a small flat unit and the wiring is tacked externally on the walls/trimmings).
Then if we move out, I should be able to just reconnect all of them I guess.

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  Reply # 651743 6-Jul-2012 10:50 Send private message

To answer myself partially:
I could just snip the two unwanted lines right now right? Even with all those messy gland joins just left there.
The only issue is reconnecting the two lines if and when required, in daisy chain or parallel.

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  Reply # 651749 6-Jul-2012 10:53 Send private message

Probably the old splitter was dead, some of the original ones from ADSL1 days are probably expiring about now.

If you are fine with one jack being the dedicated DSL jack then get a new master splitter for <$30 (less if you can find someone with an electrical wholesale account) and install it where the line comes in to achieve this:




Slap a label on the jack that's DSL only so future tenants can work out where to plug the modem in



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  Reply # 651782 6-Jul-2012 11:37 Send private message

Ragnor: Probably the old splitter was dead, some of the original ones from ADSL1 days are probably expiring about now.

If you are fine with one jack being the dedicated DSL jack then get a new master splitter for <$30 (less if you can find someone with an electrical wholesale account) and install it where the line comes in to achieve this:




Slap a label on the jack that's DSL only so future tenants can work out where to plug the modem in




Good diagram, and nice to have a reason for the splitter being removed.
Actually I work at an electrical wholesaler! (head office). But CBF installing one because I am on naked bb and have priorities that come before helping unknown future tenants with unknown requirements unfortunately, but maybe one day if i'm feeling bored and generous! who knows?

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  Reply # 652313 7-Jul-2012 18:36 Send private message

Done

Wasn't that hard it seems, but "push down" tool helped connecting the wires onto the jack points

snipped off the connected wires before any joins and put them onto the master jack. I played with a few configurations, daisy chain vs single and connecting at the different points. The ADSL stats on the (vodafone) router all seemed to come out pretty much the same! Oh well

Confident I could install a splitter/filter now, just need some of those connectors if I ever want to reconnect the other jacks. I'll Stick with the single for now.
Might look at VDSL now that I know I'm set up right (hopefully). But the vodafone naked @ $65 with mysky (-$15) is hard to beat for value to cost I think...

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