CM700 Downstream Power Levels

[ldonahue]

Hello,

1. I have a NETGEAR CM700, Firmware: V1.02.02.
2. I have super slow internet speeds on Spectrum 200MB.  My average speedtest is under 10MB.
3. If I reboot the modem, speed tests are usually around 220MB, but after about 10 minutes of doing nothing, the speed test is back to around 10MB.  The speed test is performed modem to computer, there is no router involved.
4. The Downstream LED is constantly flashing, even when the Internet LED is solid.  When I first subscribed to Spectrum 6 months ago, the Downstream LED was usually solid, and it flashed "ocassionaly".

I see that my Downstream and UpStream power levels should be in these ranges.
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router

When I look at my levels:

my Downstream power levels are between -1.7 and 2.7

my Upstream power levels are:

Upstream Bonded Channels Channel Lock Status US

Channel Type Channel ID Symbol Rate Frequency Power

1 Locked TDMA 25 2560 Ksym/sec 19400000 Hz 48.3 dBmV

2 Locked ATDMA 26 5120 Ksym/sec 24200000 Hz 48.8 dBmV

3 Locked ATDMA 27 5120 Ksym/sec 30600000 Hz 48.8 dBmV

4 Locked ATDMA 28 5120 Ksym/sec 37000000 Hz 49.8 dBmV

Spectrum blames my equipment.  What is the real answer?  Do I need a new modem?  

ldonahue

[FURRYe38 · Accepted solution]

Has the ISP checking signal and line quality up to the modem? 

Be sure there are no coax cable line splitters in between the modem and ISP service box. 

Be sure your using good quality RG6 coax cabling up to the modem. 

[FURRYe38 · Accepted solution]

Has the ISP checking signal and line quality up to the modem? 

Be sure there are no coax cable line splitters in between the modem and ISP service box. 

Be sure your using good quality RG6 coax cabling up to the modem. 

[ldonahue]

• Has the ISP checking signal and line quality up to the modem? 
  • The person you call in tech support always says signal to modem is good, but when the technician arrives, they say signal is poor.
• Be sure your using good quality RG6 coax cabling up to the modem. 
  • The tecnician cut the ends off all of the coax cables and put on new connectors because the middle wire was not flush.

After performing that service, internet speeds came back to the 200 MB range.

[FURRYe38]

Glad the tech solved the problem. Please mark your post as solved so others will know.

Enjoy.