Splitting an RJ45 socket for additional Cisco handset

Hi guys

Need a little advice on this one and hopefully not that difficult :)

We have a Cisco SG200-26P attached to a Cisco UC320W (for telecoms) which in turn has about 10 Cisco SPA502G handsets attached to it. We are looking to add another SPA502G handset but we have an issue with not having a spare RJ45 connection for the phone (at the receiving end where the handset will sit).

Currently we have a desk were this phone will go which does have a phone (SPA502G handset) on it. This area will get a second desk and this is where the second phone, computer, etc. will go.

Is it possible to split the the RJ45 connection for phone number 1 into 2 (possibly with a PoE hub?) and thus allow a second handset to be plugged in using the one RJ45 wall connection? Or do we need to run a new RJ45 connection back to the rack (from the new desk area, for the new handset) and connection this back to the SG200-26P switch?

Hope that makes sense and thanx for any advice you can offer.
Steven O'NeillSolutions ArchitectAsked:
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Mal OsborneAlpha GeekCommented:
Those splitters are evil, best avoided. They don't work with Gb, and probably will not work with POE either, depending on the implementation.

Even with 100Mb, it runs out of spec, and may or may not work, although usually it seems OK if cable runs are kept short.

Cisco phones have a pass though CAT5 connector, usually reserved for a PC. This does not pass through power, but a cheap POE injector will let you use two phones one cable run easily enough.
Jody LemoineNetwork ArchitectCommented:
As long as you're not expecting more than 100Mb connectivity, you should be able to do what you're talking about. Neither 100Mb Ethernet nor PoE (802.1af mode A) use more than two pairs, so there's no immediate show-stopper... though running 48vdc through all four pairs may have some unforeseen implications. Personally, I would just put a small (four or eight port) PoE switch where you're needing another connection. It's easier to work with, provides gigabit connectivity and is simpler to support.

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Steven O'NeillSolutions ArchitectAuthor Commented:
Thanx for that Malmensa

I'm thinking that as well as a phone each desk will have a computer as well (sorry should have made that clear). So the phone that is already there has a laptop running off the pass through connector.

So from this single RJ45 we would be looking to have 2 laptops and 2 phones...the guys using the area are not always in (as far as I'm aware).

I was thinking of breaking it down with the a small PoE hub, something like this: http://goo.gl/ErXTqy

Don't know if this would work though.
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Jody LemoineNetwork ArchitectCommented:
That will work just fine fir this application.
Jody LemoineNetwork ArchitectCommented:
Er... for this application.
Steven O'NeillSolutions ArchitectAuthor Commented:
Hi Jody

Thanx for the response. I was typing back to Malmensa there but are you saying we could use something like this - http://goo.gl/ErXTqy - at the desk?

So this would mean that the RJ45 cable coming from the wall (and currently into the SPA502G) would be plugged into this new hub and then we can attach the current handset and the new handset to this new hub?
Steven O'NeillSolutions ArchitectAuthor Commented:
Getting crossed over there lol
Jody LemoineNetwork ArchitectCommented:
Depending on the power draw from the phones, you may need to plug the switch into the wall rather than rely on PoE for the switch power though.
Jody LemoineNetwork ArchitectCommented:
Steven O'NeillSolutions ArchitectAuthor Commented:
Thanx guys

Jody - so if there is any potentially issues with power then I should be looking to a powered unit then? The original on above is pass-through only so should we be looking at something like this:


Mal OsborneAlpha GeekCommented:
Yeah, a small POE switch should work just fine. In theory you could cascade two phones, using a POE injector as well. One of these things: https://www.ple.com.au/ViewItem.aspx?InventoryItemId=609595
Jody LemoineNetwork ArchitectCommented:
That unit should come with an external power brick as well. You'll want to double check that. If it does, you're good to go. Chained off of the SG200 using PoE, it will only be able to power one of the two phones.
Steven O'NeillSolutions ArchitectAuthor Commented:
Thanx Malmensa

Jody - this 8 port unit comes with an AC adapter so that covers the power. I'm assuming if I went for the 4/5 port model (which does not have a separate power supply but uses PoE pass-through) then I would only get one of the two handsets powered.

However, since the 8 port version does have it's own power supply (and 4 dedicated PoE ports) then by adding the 2 handsets to 2 of these ports then this should give me the 2 connections needed?
Jody LemoineNetwork ArchitectCommented:
Looks like no external power is available on the GS105PE, so the second switch is your best option.

Jody LemoineNetwork ArchitectCommented:
Exactly. You'll still want to plug the PCs into the phones so that they can prioritize their own traffic over the PCs' traffic, but that will work well.
Steven O'NeillSolutions ArchitectAuthor Commented:
Thanx for all your insight guys...think I'll go with the PoE hub option as it seems cleaner and a little easier to look after (not always on-site) so makes sense to have it simples :)
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