I recently upgraded our modem to take advantage of the 3.1 standard. Consulting Comcast's list of approved equipment we selected the SB8200. We are on the Starter pkg in the Denver area.
The modem indicates 3.1 / blue on the downstream but the upstream is showing 3.0 / green. Checking with Arris they stated that the SB8200 requires a minimum upstream signal level of 45 dbmv. The current levels provided by Comcast are 38 - 42 across the 4-upstream channels.
Regarding resolution of the issue I'm having, Arris points to this minimum requirement and Comcast points to the signal levels as meeting Comcast's specification which leaves me still pointing to the green DOCSIS 3.0 upstream indication. Comcast refuses to adjust the signal level higher and yet still lists the SB8200 on their approved list. They also pretty much have a "who cares" attitude and their solution is, expectedly, to lease one of their modems.
1. Does the failure of the upstream to utilize 3.1 have anything to do with the starter package speeds?
2. Is anyone using a modem that achieves 3.1 on the upstream channels with signal levels at or below 42 dbmv?
Thanks in advance for your reply!