Will the new Comcast router that has built in Wireless dual band AC work with the Asus AC2400 RT-AC87U router?

TYTSoldier

Distinguished
Jun 6, 2012
284
0
18,790
I'm trying to help someone with a large residence set up a network. I'd like to use the Asus AC2400 RT-AC87U router since it is supposed to have great range. Will there be interference from the Comcast modem that has built in wireless ac? Currently, there's another router hooked up and there have been some Internet troubles, and apparently Comcast said there must be interference. I'm wondering if the same will happen with this new router, or if it should be ok to purchase.
 
Solution
Unless you set the channels manually you generally have issues in any router. On 2.4g there is only 60mhz and most routers now attempt to use 40mhz which means 2 can not coexist. You must force then to 20mhz and then pick assign a channel to each, only 1,6,11 represent the 3 20mhz blocks.

On 5g when you use 802.11ac it uses 80mhz. There are 2 blocks of 80mhz available the lower 4 channels and the upper 4 channels you need to assign a router to each. The bad news is the new so called tri-band routers have 2 5g radios so they use both 4 channel block and you will get a conflict no matter what you do.

Now this only assumes the routers you control. You likely have a neighbor who has a tri-band router using 40mhz of the 2.4g and...
Unless you set the channels manually you generally have issues in any router. On 2.4g there is only 60mhz and most routers now attempt to use 40mhz which means 2 can not coexist. You must force then to 20mhz and then pick assign a channel to each, only 1,6,11 represent the 3 20mhz blocks.

On 5g when you use 802.11ac it uses 80mhz. There are 2 blocks of 80mhz available the lower 4 channels and the upper 4 channels you need to assign a router to each. The bad news is the new so called tri-band routers have 2 5g radios so they use both 4 channel block and you will get a conflict no matter what you do.

Now this only assumes the routers you control. You likely have a neighbor who has a tri-band router using 40mhz of the 2.4g and 160mhz of the 5g leaving almost nothing for anyone else.
 
Solution