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What's the difference between RJ11 and RJ45?
Friday, October 23, 2020
RJ, which means Registered Jack and 11/45 is merely the number assigned to the interface standard.
“A registered jack (RJ) is a standardized telecommunication network interface for connecting voice and data equipment to a service provided by a local exchange carrier or long distance carrier.” wikipedia
Appearance
In general, RJ45 is bigger in size than RJ11. RJ45 plugs are long and rectangular, with a width of just under 11.65mm. RJ11 plugs are square and shorter, with a width of 9.65mm.
Moreover, RJ45 has 8 wires inside while Rj11 has 4 wires. RJ45 is 8P8C (8 positions, 8 connectors) connector and RJ11 is 6P4C (6 positions, 4 connectors) connector.
Usage and Application
RJ45 is mostly used in ethernets, e.g. connecting cable modems with Wi-Fi routers. While RJ11 is used in conventional PSTN telephone networks, e.g. phone lines, ADSL lines, modem cables.
Supported Bandwidth
RJ45 supports bandwidth upto 10 Gbps over ethernet, while RJ11 supports upto 24 Mbps.
To stream in 4K or Ultra HD, you’ll need speeds up to 25 Mbps. To transfer large files, you’ll need speed up to 40+ Mbps. To support an unlimited number of devices and users, you’ll need gigabit internet speeds. However, the speed largely depends on your agreement with ISP and your devices.
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