Talk about modems

Thanks very much sns.

Yes, the Arris SB8200 has the Broadcom chip; recommended by xymox over on whatsbestforum. It has a wall wart power supply, so I am looking at a potential LPS for the modem (and maybe the fiber media converters - see below).

xFinity/Comcast has sent me a ’welcome to your new service’ email last week, saying ’let us know when you are ready to activate it..’ I assume I will have another home wifi network, though here is what I found on that question:

Q. Does Arris SURFboard SB8200 have Wi-Fi?

A. Connecting a Wi-Fi router to the SB8200 is recommended when there are multiple client devices in the home network. NOTE 2: It is possible to connect when there are multiple client devices in the home network two devices to the SB8200. However, the cable provider must provide Internet IP Address to each device for Internet access.

So it sounds like I will have 2 wifi networks coming in [on the same cable coax], and would just use the one in the living room for audio (and wifi from the SB8200 modem to a tablet to control the [hard-wired] streamer). Another possibility is to run an ethernet cable from the back of my modem (or streamer?) to a tablet or laptop in my listening seat. My existing XFi modem/router would still stream wifi to the TV’s flex boxes in the living room and bedrooms.

I realize that another thing I may run into is noise - coming in/through on the cable coax line, so I may end up needing to do the "ethernet to fiber back to ethernet converter(s)" process. Though I don’t think I will need another router, switch, or ether regen, etc. since the entertainment system will essentially be a ’closed’ system. Not totally clear(?)

Will keep this modem thread posted on learnings.

Thanks again.

Why would I need a router or switch(es) between my modem and server/player, if I’m just using that cable line for audio/entertainment closed system only? (no house wifi/networking)

@westborn 

As mentioned, having 2 networks will make access tricky.  You want a router between you and the modem because of the firewall features. A simple modem won't have this important internet safety feature, but the more integrated modem/routers will.  The latter usually have 4-5 Ethernet outlets.

@westborn Just looked at your new modem. The SB8200 has two ethernet ports, one will go to streamer, other to remote control device. Most likely you're going to have to use a laptop as this device, and it must have ethernet port, everything hard wired, don't need wifi at all. The laptop will be provided permanent IP adress. Very unlikely your tablet has ethernet port, extremely limited number do. Not all laptops have this provision as well, in which case use usb to ethernet port conversion device. You don't have to worry about wifi with this setup.

Telephony or having telephone connected to modems is another concern because of contamination/ noise. Don't connect phone to modem, most ISP have dedicated phone modems, just have to ask.

I purchased an enterprise level managed router couple months ago, has NO wifi capability. My intention is to experiment with completely isolating audio system from wifi contamination. I have Trifield meter which measures emi in form of rfi, wifi capable routers are one of the richest rfi environments, read noisy components connecting to our audio systems. With the managed router, wifi can be segregated to separate branch.

Keep us informed, will be interested to hear your outcome in regard to sound qualily.

Thanks for your thoughts sns.

I will not be using the Arris SB8200 modem for any telephony, in fact I don't think it even has telephony capability (one reason it was recommended on WBF I believe).

It will be easy for me (logistically) to run an ethernet cable from the modem at the back of my audio gear rack|table - to my laptop along a [left] wall just under the carpet and into the laptop - where my listening seat has an end table to its left along the same wall. Probably about 20 feet of total ethernet cable distance. I could use a simple ethernet to USB converter into a tablet or laptop (especially if it will just primarily be used for controlling the streamer); or I guess at that point I could ethernet-connect a desktop PC under the end table and a monitor on top of it, or of course us an 'all in one' like an IMac. Although I suppose the more complex device the higher the risk for backhaul of potential PC noise back down the line to the modem and streamer.(?)

Seems like a bit of an old school (pre|no-wifi) setup, but it would achieve isolating the audio system from wifi contamination as you say.

Will keep the forum informed.

@sns thanks for the post and it is nice my modem was on the recommended list!