Hi
Apologies in advance for this somewhat lengthy post, but I'm hoping it will attract the attention of those more enlightened on the subject (Simon in Suffolk
) and I wanted to give as much background info as possible to allow folks to understand what I've got and what I possibly need to change etc.
So here goes ...
I'm using an Apple Time Capsule (router) connected to a Draytek Vigor 120 ADSL modem - using PPPoE for everything in the home. Both devices are currently located on the bottom shelf of my hifi rack and plugged into the domestic electrical supply - whereas the Naim ND5 XS, Chord Hugo and all the active ATC equipment (pre amp and active speakers) are fed from a completely separate electrical supply from the meter and do not share the domestic Consumer Unit.
The ND5 XS and QNAP NAS are connected via Ethernet to the Apple 'router' and so is the Sky HD box - which uses up all of the 3 Ethernet ports on the Time Capsule. We also run an Apple TV box, mobile phones, iPad and laptops using wifi connectivity from the Apple Time Capsule.
Everything seems to work perfectly, but curiosity has got the better of me and I was beginning to wonder whether it was a bad idea to have the Apple Time Capsule so close to the hifi equipment and if the wifi signal it generates could deteriorate the sound quality in anyway - albeit the streamer and NAS use Ethernet connections.
Hopefully this is all okay and it certainly doesn't seem to be problematic in anyway apart from the occasional dropout when listening to Paradise Radio via the ND5 - which I simply put down to being normal for internet radio.
If I will definitely get improved sound quality by moving the network equipment off the hifi rack and away from the hifi, then I wondered about this options;
1. Leave it as it is - no change
2. Put Apple Time Capsule/Draytek Vigor modem in the study upstairs, run a long Ethernet cable to the lounge downstairs and use a Network Switch in the lounge to plug in the ND5XS, QNAP NAS, Apple TV and Sky HD box - all Ethernet
3. Put the Apple Time Capsule/Draytek Vigor modem in the study and use it solely for wifi purposes - computers and phones etc. Use another Netgear modem/router in the lounge to plug in the Ethernet devices (ND5, NAS etc) - BUT switch off the wifi function on this particular router.
If option 1 needs to change, then I like the idea of option 3 but wondered whether having two routers in the house would be problematic, since they would be on the same internet broadband BT line. I don't know if this would cause issues or a conflict etc.
Sorry for the rambling, but hopefully it makes sense - to someone 
Posted on: 13 August 2014 by james n
Sorry, not Simon and i'm in Surrey not Suffolk but...
Just to add to Garys comments, as well as acoustic noise from hard drives, mechanical noise will couple through racks and supports. I'm not sure how you have your rack setup, but keep these (and the Sky box with its internal fan and drives) off the same rack your Hi-Fi sits on. I've always kept wi-fi devices away from any audio boxes (or disabled wireless cards and used wired connections).
Posted on: 13 August 2014 by Simon-in-Suffolk
Ok chiming in from Suffolk... I have some hours off today to do some boring DIY.. got bored with that so here I am 
Agree with Gary and James, best keep mechanical disk drives away because of the intrusive ticking and whirring...
I personally like your number 2 option, but you would keep your NAS upstairs next to your Time Capsule. Alternatively you could have your Time Capsule downstairs... near your audio stuff. It's disk and fan are almost silent.. Apart from some ticking when it wakes up. You could then run an Ethernet lead (you have upto 100 metres) to the Vigor modem From the TimeCapsule. Ok the TimeCapsule has a wifi transmitter, but unless right very close by your audio equipment, I'd be be surprised if you heard anything negative.
Good luck
Simon
Posted on: 13 August 2014 by Bart
I'd go with choice 2. I have a similar setup, with all of my network hardware on a rack on the top floor of my home. My main system is 2 floors lower, with just a long run of ethernet cable from the top floor to the main system room. I don't need a switch there because the only networked device in that room is my NDS. I have purposely kept it simple that way.
You'd be surprised how much even a little noise from something like the Time Capsule can be noticed once it's no longer there. Keep the nas and Time Capsule away from the main listening space.
Additionally, I did not like the look of all of that hardware in my living room. Flashing lights, etc., are not elegant.
Posted on: 14 August 2014 by Mr Frog
If I go for option 2, I'll need to run the Ethernet through the wall in the study, down the outside wall and feed it into the lounge.
Presumably Cat 5e cable will be fine and I thought about using Ethernet wall sockets to make a neat job in the study and lounge - then plug the shorter network cables into the Ethernet wall sockets.
Although this sounds fine in principal, I wondered whether having a number of joins in the cable would cause issues (i.e. Two wall sockets) and whether the Ethernet outside (approx 15m) could attract radio interference or the like.
Any advice would be much appreciated 
Posted on: 14 August 2014 by Bart
Gavin, a photo would be useless, so let me describe in words.
My broadband comes into my home and directly to the cable modem / router supplied by the isp (Verizon FiOS here). Because of the way the broadband works, I can put the modem/router anywhere in the home that it can connect to the home coax wiring. So I locate it on my 'server rack' up in my loft area, where the rest of my hardware is and where it's out of sight. The cable comes into my home down in the basement, but that's of no consequence as I can plug my tv cable boxes, and the modem / router, into ANY of the home coax outlets and it works just fine.
I have wifi turned OFF on the cable modem / router, as it performs poorly. The cable modem / router provides the DHCP services, and everything gets a 192.168.1.x address. I have one connection from the modem / router -- to a 16-port switch.
For wifi, I have an Apple Time Capsule connected to the switch. It provides my home wifi, along with an Airport Extreme elsewhere in my home which is set up to 'extend the wifi network.' I am very happy with my wifi performance. Neither the Time Capsule nor Airport Extreme do DHCP; this way I avoid the double-NAT problems.
Everything that is not on wifi is wired into my 16-port switch, including my NDS which is located two floors down and connected by a long run of ethernet cable in the walls. There is an ethernet wall outlet both in the room with my NDS and in the room with all of my hardware, so that simple patch cords connect that long run to the NDS downstairs and to the switch upstairs.
Also wired to that switch is my nas, my uServe, my Qute, my Apple TV . . . maybe I'm forgetting some stuff!
The switch is a TP-Link L-SG1016D. Maybe there are better ones out there but it seems to perform well. It does not have an external SMPS box; the ac (mains) cord plugs directly into it. The power supply obviously is built in; whether it's "quieter" that way, or not, I am not sure.