netgear c3700

If the upstream light is flashing, there is probably something wrong with the cable signal. Can you post the signal levels? Everything from "Startup Procedure" and down. The instructions are below, or see page 20 of manual.

To view the status of the modem router initialization:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and
password are case-sensitive.
The BASIC Home screen displays.
4. Select Cable Connection.

Upstream

Channel atdma.  2560 Ksym/sec 25000000 Hz 43.3 dBmV

                Atdma.   2560 Ksym/sec 29000000 Hz 43.3 dBmV

                Atdma.   2560 Ksym/sec 33000000 Hz 43.3 dBmV

            Tdma and atdma 2560 Ksys/sec 37000000 Hz 43.3 dBmV

Odd, a blinking upstream means its searching for upstream, but if it's listing upstream power levels on 4 channels, that means it found it. Is it still blinking?

Whats the "Connectivity State"? Should be under Startup Procedure up toward the top of the page.

Agreed it is odd.  It still blinking. Wish I could say otherwise 

Connectivity state show OK  Operational.

Does everything work? Like are you online with good speed?

Maybe try rebooting it? If nothing else that will tell you if its just a faulty LED, since it will do a lamp test on reboot.

Pings and browsing are not working.  Pings are both done to the gateway. Currently 172.16.170. From the modem and the pc

Does the Mac address from the modem need to be allowed?

wayneh said:
Does the Mac address from the modem need to be allowed?

Yes. Unless you bought the device from a Cox store, you need to call technical support and give them the modem's model number, serial number(SN) and MAC address. That would explain the 172 IP address, which Cox only gives out to modems which are not active for service in Cox's system.  No idea why that would make the upstream blink though.

I think there may be a snag though. I don't see that model on Cox's list of compatible modems. This may be more of a policy issue then a technical issue...but then again your modem is acting weird..maybe Cox doesn't have firmware on file for it. Only way to know is to call and try.

Thank you. Guessing the flashing upstream is normal..  Internet works and they just added the serial and mac

wayneh, 

Have the lights gone solid since the modem was activated for you? I've checked the device documentation and want to be sure about the device you have. It's this one, correct?

  http://www.downloads.netgear.com/files/GDC/C3700/C3700_UM_4Mar2014.pdf

If so, I'd suggest returning the device to the store where you purchased it and replace it with one from our approved list of modems. If the modem is not approved we will not have the proper firmware as supplied by the manufacturer and can not guarantee the functionality of your device.

Colleen,

I just bought a Netgear C3700 and I notice the same issue - the uplink LED light continuously blinks. I talked to cox online support (Phoenix market) when I tried activating the device and they said that as long as the device can connect to Cox network and I have internet access, it should be ok to use the device even thought it is not on the approved list.

I seem to have ok internet connection and the stats from the modem does not actually indicate whether there is any uplink problem. I do notice that the Lock status is blank in both uplink and downlink but that may not necessarily indicate a problem

Now looking a this thread in this discussion group, I am wondering if should consider replacing it with one of the approved modems, given that Cox may not provide any firmware support.

Any comments would be appreciated.

Looks like your bonding on 8 channels down, and 3 up. The devices maxes at 4 upstream channels, but most areas don't need all the channels open yet.Another words, everything looks good. Try speedtest.net and run a couple tests. I would only worry about it if it causes any kind of performance issue. 

I got a C3700 for xmas.  It is on the cox approved list.  I have the blinking upstream light and my details from the Netgear Genie are similar to everyone elses.  My problem is that devices in the house do lose connectivity from time to time and I have a problem playing a game on an ethernet connection since I got this.  I have heard about upstream channel power problems impacting connectivity.  I have one splitter, cox says the signal is good.  They say power should be 35 to 49 and mine was 51.  The genie said the upstream power was around 42 for all 4 channels so I am not really sure if I have an upstream power problem or not.  On the ethernet PC, i can watch youtube, or a game, without problem and my connection is always up.  When I actually start playing the game, though, I get frequent very quick freezes and lags since I got this modem/router.  Not sure if the game and the wifi connection issues are related, but they both happened at the same time.  I have seen that an active return amplifier can help solve an upstream power level problem, but I still can't tell if I actually have that problem.  Any thoughts?