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C7100V Battery LED flashing
I have this (Comcast-specific) cable modem & have disabled the router function, as I'm using it with my existing ASUS wireless router. Because I'm not using the Netgear's router function, I can't simply log into it to check the battery function. (Or is there a way I don't know?)
There is a battery installed, and the battery LED is flashing. The manual doesn't have any information on this. What does it mean? What should I do?
I remembered that with this modem, no changes work unless it's rebooted. (One reason I'm using it in Bridge mode). I rebooted from my Comcast page, and then I changed the password and logged in successfully, after only 2 or 3 tries. All that to ascertain that the battery status is "Bad."
Which I could have guessed, had I checked Amazon for the battery and read the long list of battery failures -- no other brand for the battery than Netgear.
I'm removing the battery and plugging the C7100V into a UPS. Not the ideal solution, but a UPS with high capacity will give some talk time if needed.
I would not recommend this device to anyone. Unfortunately, it is one of two voice modems approved for Comcast that will handle their higher speed options, the other being an Arris that has even worse reviews than this.
12 Replies
Change the modem back to router mode temporarily to see if there is any web page UI for the batter.
Is there a front LED thats blinking?
If the modem is in modem mode, then a battery wouldn't be really important or needed. Nothing to save if the modem looses power.
> Because I'm not using the Netgear's router function, I can't simply
> log into it to check the battery function. (Or is there a way I don't
> know?)Visit http://netgear.com/support , put in your model number, and look
for Documentation. Get the User Manual. Read. Look for "Set Up the
Modem Router in Bridge Mode".Note: When your modem router is in bridge mode, use
http://192.168.100.1 to log in to your modem router.> There is a battery installed, and the battery LED is flashing. The
> manual doesn't have any information on this. [...]At which "The manual", exactly, are you looking? In the C7100V User
Manual, look for the LED descriptions and "battery"?> If the modem is in modem mode, then a battery wouldn't be really
> important or needed. Nothing to save if the modem [loses] power.Yow. For what does the "V" in "C7100V" stand? In the C7100V User
Manual, look for "Install an Optional Battery"?The battery can give you five hours of additional talk time and
eight hours of idle time for voice service during a power outage.For about the past century, conventional telephone central offices
have supplied the power to make conventional telephones work, typically
including a (large) battery in the system to deal with electric power
failures. Without that conventional telephone central office (and its
battery power), as with VoIP, some people would like to continue to have
some telephone service during a power failure. It's not complicated.antinode: Thank you for the excellent answer. Yes, of course I installed the battery to keep the voice connection alive in time of emergency.
I must have been searching the install guide, not the manual, because as you say, the LED and login information is there in the manual.
However when I tried to login, I ran into a snag. Every time I connect via http://192.168.100.1, I get a Web page telling me to change the password. I do that, and the modem disconnects. When I reconnect, I get the same Web page telling me to change the password. And so on. It seems to be an endless loop.
What am I missing?
