CM600 and Suddenlink

Is this modem officially supported by your ISP? 

Have the ISP check the signal and line quality UP to the modem. 
Be sure there are not coax cable line splitters in the between the modem and ISP service box. 
Be sure your using good quality RG6 coax cable up to the modem. 

Be sure you test with a wired PC connected directly to the modem, remove any wifi routers in between.

The modem is supporting of near 900Mbps on the down. However some ISPs may not fully support some older modems. 

The CM1000, 1100 and 1200 are all Broadcom. 

---

marshallll wrote:

I recently upgraded from an Arris SB6190 afte learning about the puma 6 issues while dealing with some inconsistent connectivity with my cable internet. Those connectivity issues resolved themselves by the time the CM600 showed up, but i gave it a shot to alleviate the latency issues I had with the SB6190. 

Now, my download speeds are stuck at around 20Mbps with the CM600. I pay for 400Mbps. I've checked all connections from the drop to the house. Theres a 4 way splitter from the drop that the cable modem line is connected to. This coax cable is RG6 and relatively recent. 

 

I DO get the advertised 400Mbps when I swap the CM600 for my older SB6190, but I would ideally like to keep this CM600 since it's got a broadcom chip

I've attached my modem status with signal levels. Seems to me that they're on the low side. I'm really scratching my head with this one. Considering running the cable line off the drop with a two way, then adding a three way to deal with the TV lines and hoping that increases the signal levels enough for the CM600 to work at 400Mbps. But I also don't want to do all of that if my modem is just faulty to begin with. 

I will try running the modem directly off the drop tomorrow to see if that helped. In the mean time, anyone got any ideas?

---

You're power levels are low. The ideal range is -7dbmv to 7dbmv. Minimum acceptable ranges are -8/10 dbmv to +8/10 dbmv. some devices will work up to -15dbmv to +dbmv but can have issues/drops. 

I'd try pulling that 4x splitter out of the line. 

If you have to split, you should do a dual splitter with one line going to the modem and the other going to another splitter if needed for tv's. That way the modem is still getting the signal with only a slight reduction. 

Also check for extended runs, kinked coax, loose connections, etc. this can cause issues to.

if you continue to have issues, have suddenlink check your line as your power levels are to low.