I know 100% that this device is a modem with 2 telephone lines and even more noticed; It's not a router and it doesn't have WiFi. I bought the modem knowing that it was the ONLY modem with 2 phone ports. Calling Comcast was quick and easy, I just asked to update the modem on my current account and remove the modem that is already on my account. The call lasted no more than 15 minutes. Note: I don't have phone service, but I still chose this modem with its phone ports in case I want to add that service in the future. The reason I called this review the worst modem is because it is the worst modem. je. I've had cable internet service for exactly 19 years and have jumped through various speed packages as they became available in my area. My currently selected speed package is 1000 Mbit/s (or known as Gigabit speed = 1 Gbit/s). The modem hung (hung, completely unresponsive) after days 1-3 and had to be physically unplugged to then start the boot sequence. You will see a red dot next to the modem indicating that the modem is disabled. A call to Comcast confirmed the device was completely unavailable, while sending an "upgrade signal" proved nothing; the modem is still not responding and no errors could be read from the modem at this time. Coincidentally, this always happened at night, but definitely not at one o'clock; it could have been 10pm or 3am (even if it is very early in the morning we would still call it night). The problem reproduces irregularly every 1-3 days. I've never tested upstream/downstream on a device, so I can't provide that information. Negative experiences aside, this modem has to be one of the fastest booting modems around. The startup sequence that establishes the synchronization/initialization (starting the online process) to provide the service after a connection is established. The time frame was definitely less than 2 minutes. This modem uses solid LEDs (not blinking to indicate activity). The modem has 3 white LEDs, all of which are solid, indicating that the modem has completed the synchronization process and is ready for use. This solid pattern of light can be viewed as both good and bad; In general, you might hate devices with flashing lights. However, flashing lights can be an indication that the device is working, responding, and continuing to work. The modem has 3 (dim) white lights: 1 for power, 1 for upstream/downstream, and 1 globe icon. As an alternative, I returned the Arris T25 modem and bought another Arris modem! Yes, the Arris T25 I received might be defective, but it still counts as 1 star (better if 0 stars could be given). Note: The Arris T25 modem uses an Intel processor/chipset (Intel PUMA 6). The Intel PUMA 6 was listed with a major "do not buy" warning (it was found "defective" due to identified security vulnerabilities and is currently in a class action lawsuit). In comparison, most modems use a Broadcom processor/chipset. The Arris modem purchased at the time is a Surfboard 8200 and has proven to be 100% stable! Again, this device is ONLY a modem and offers nothing else. Again, this is well understood and something I consciously bought. The modem showed 989 uplinks and 44 Mbps downstream on my Comcast 1000 Mbps plan; I find this operation perfectly acceptable. It should be noted that this modem also operates with solid LEDs (not blinking to indicate activity). This modem uses 4 indicators: 1 for power, 1 for downstream, 1 for upstream and 1 globe icon. As the indicators turn green, the lower indicator turns blue, indicating that the device is ready for use. Note: The Arris 8200 modem uses a Broadcom processor/chipset (BCM3390).
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