- The Model of the Modem? Not applicable. Your fiber connection will not require a modem, sonic will install an optical network terminal or ONT. This will convert the fiber cable from the exterior transition box to an RJ-45 cable (a basic Ethernet cable such as you currently use to connect wired devices to your router). The RJ-45 cable running from the ONT can be connected either directly to a device or to a router.
- The Model of the Router? This varies, posts I have seen recently have pointed to sonic providing new users with a smart RG router however I have yet to see an exact model number, many current users were initially provided with Arris 5268AC routers but I believe they are being transitioned off as the 5268AC could not achieve full gigabit throughput.
- How many Upstream Channels the Modem has? One again Not applicable. Fiber does not function the same way cable does and will not be provided over dated coaxial wiring.
- How many Downstream Channels the Modem has? One again Not applicable. Fiber does not function the same way cable does and will not be provided over dated coaxial wiring.
- How many Upstream Channels does Sonic support? (important!) One again Not applicable. Fiber does not function the same way cable does and will not be provided over dated coaxial wiring.
- How many Downstream Channels does Sonic support? (important!) One again Not applicable. Fiber does not function the same way cable does and will not be provided over dated coaxial wiring.
- Is the provided Modem and Router a "Combo" piece of equipment? (both Modem & Router combined in one housing) Not applicable, as a modem will not be used.
- What speeds have you personally been able to, consistently, achieve? Wired? Wireless? (I understand Theoretical vs Actual) Once again fiber does not function the same way cable does. With cable bandwidth is shared between a neighborhood and as a result you will often not get the full speeds you pay for, with fiber each user has a dedicated amount of bandwidth. Your ONT will receive exactly 1 Gigabit up and 1 Gigabit down (or 125 Megabytes up and 125 Megabytes down as 1 byte is 8 bits). Even if everyone in your neighborhood has sonic gigabit fiber and they all decide to saturate their links simultaneously you should still receive the full gigabit up and down. However you should see some throughput loss on the last leg between your router and your computer due to transfer overhead. Typically on a wired connection to a device with a gigabit network interface (most computers built in the last 10 years) you will see between 900 Megabits per second and 975 megabits per second. As for wireless speeds they will vary greatly depending on a number of factors including range from the router, construction materials used in the walls in your home, and performance of the wireless card in the client device.
I recommend that you watch this video https://www.youtube.com/watch?v=-JMcOAJHZok
as it will give you an idea of the equipment that will be installed and what to expect on the installation day.
One big issue with getting your own router is finding one that can handle synchronous gigabit throughput without costing an arm and a leg. There are currently very few consumer level devices that can do it and most are very expensive, for example the NETGEAR Nighthawk X10 is the only one I can think of off the top of my head and it holds a $340 price tag. The most cost effective solution would be a budget pfsense router built from and old pc however a moderate amount of networking knowledge is needed even for a basic setup of a pfsense router. Most mid range consumer routers are limited to around 500mbps total throughput and most high end consumer routers are limited to 750-1000mbps total throughput.
Also please remember that sonic will not be able to provide router support if you buy your own router so unless you are willing and able to handle any setup and configuration your router may require buying your own is not a good idea.
I am using a pfsense router however I work in the IT support sector and hold both CompTIA A+ and CompTIA Network + certifications. For someone without an advanced knowledge of computers and at least a basic understanding of networking concepts I would not recommend going the pfsense route.