Tyler, TX apparently has at least 12 downstream channels according a thread here in the Suddenlink forums.
now on the other hand I have TWC in the Dallas metro currently at 8 downstream and 4 upstream bonding and soon to go to 16 downstream 4 upstream bonding to support 300/20 tier
also I have a rented SBG6580 right now soon I will be switching to my purchased SB6183 to take advantage of the 16 downstream channels when/before my node gets upgraded to be able to get my speed bump from 15/1 to 50/5 consistently at night due to two 300/20 customers at once being able to congest the node if full download was done consistently.
I do have family in east TX that have or did have Suddenlink and their system only had/has room for 4 DOCSIS downstream channels due to having close to 15 HD channels that are locals. they have locals in HD on: 543MHz, 549MHz 585MHz, 591MHz and 579MHz had 2 SD local subchannels on it around christmas: that Tyler has DOCSIS channels on so I would assume that their area will have to remove analogs or go all digital expanded basic to even try 8, 12, or 16 downstream bonding even after the system being 860MHz.