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Oct 03 2012

Zoom 5341J cable modem

After moving back to the midwest United States, I was immediately reminded of the frustrations of dealing with the primary cable internet provider–Charter Communications. They offer fairly good speeds, and when considering the price, the performance-to-cost ratio is outstanding. However, the reliability of the service leaves a lot to be desired.

One of the primary problems when I lived here before was the really poor modems (and corresponding Charter-infected firmware) that they provided. Never fear, though, as I came back with my own modem… or so I thought. Apparently in June of 2012, Charter announced that customers can no longer use their own modems. So, with my service came a free lease of a Cisco DPC3010. Not a bad modem, barring the firmware that Charter has loaded onto it (which eliminates the administrative login credentials, and thus, one can’t look at the logs). Though there is a user account for logging in (Username: chtruser Password: charter), the administrative functionality has been removed. The modem, however, (and again, likely the fault of the Charter firmware, and not the Cisco modem itself) refused to channel bond on downstream (upstream bonding is not yet offered). As a result, my downstream speeds were abysmal by comparison to the rated speeds.

After arguing with the customer service team at Charter, I finally convinced them to provision my modem. I have a Zoom 5341J modem, which is a nice, affordable modem that supports up to 8 bonded downstream channels and up to 4 bonded upstream channels. Within its administrative interface, it also features information regarding the lock status, modulation, channel ID, frequency, power, SNR, and (un)correctable errors. The modem also has a hidden menu which can only be accessed by going directly to the URL:

http://$MODEM_IP/RgEventLog.asp

replacing $MODEM_IP with the actual IP of the modem (which by default is 192.168.100.1, resulting in a full URL of http://192.168.100.1/RgEventLog.asp). This page shows all of the events in in the SNMP log, which is highly valuable information if you want to actively monitor your network status.

In any case, the new modem with the stock firmware (unmodified by Charter) is working beautifully with four bonded downstream channels (the maximum for my package). I strongly recommend the modem for its reliability and price point.

Cheers,
Zach

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