Two modems with an RG6 switch.
Two modems with an RG6 switch.
Moved into a new home, internet and cable are already connected through most coax ports. Modem and router were installed without an RJ45 outlet, but it works well for Wi-Fi. You can purchase a separate modem and place it where it’s easier to access later. Using a coax splitter or switch won’t interfere with the setup; it just helps manage both Ethernet and cable signals.
Running two modems simultaneously on a single internet connection isn't possible under consumer services. Each device needs its own distinct MAC address and IP address. Most ISP plans for consumers only allow one modem at a time. Since the MAC must be registered with your provider, you can't randomly change devices.
You may purchase your own modem, but you cannot operate two simultaneously on the same account. This arrangement has persisted for a considerable period. Occasionally, individuals have enrolled multiple accounts at the same address and even set up complex duplexing to increase bandwidth, though this approach is costly and less efficient today. A coaxial splitter can be used, provided it is labeled as bi-directional—some models lack this feature for protection against RF interference and signal crosstalk in older systems. Modern splitters are almost universally bi-directional. Because television and internet signals use separate frequency bands on the cable, they can coexist without conflict, allowing a TV and modem to connect to the same wall outlet safely.
Only one modem per account is allowed. Adding a second modem treats it as a separate service and requires a new bill. Coax cable doesn’t include a switch—it uses splitters instead. Keep the number of splitters between your main line and modem low; each one reduces signal strength. If you need to install a switch elsewhere and don’t have Ethernet already, consider MoCA adapters. They let you reuse your internet coax for a wired connection in areas without Ethernet. Configuration is a bit more complex, but speeds can reach up to 800mbps or higher with the latest MoCA standard.
Those connectors look great, I need to dig a bit deeper before deciding if using a splitter is the best option. A pair splitter at $160 seems like a solid choice. Should I match the frequency, and will I be setting up a bidirectional connection? I’m hoping to learn more about coax networking since we only covered RJ standards in college.
Splitters are fine with Moca and they support bidirectional communication. Their frequency range is 1-1.5 GHz, which differs from what cable providers typically use. Companies like Comcast employ Moca for full-home DVR systems. The main concern is this: the distance between adapters must not exceed 300 feet. You should install a Moca filter on the main cable entering your home to stop the signal from escaping. Additionally, you can only connect 16 Moca devices on a network—meaning adapters. If you have multiple machines, use a switch. The main drawback of Moca compared to Ethernet is its half-duplex mode, which limits it to transmitting in one direction at a time.