The RJ11 plug has between two and six gold contact pins. Most common is the 6P4C type — six positions with four actual copper wires. RJ11 cables are not meant for high‑speed Ethernet (that’s the larger RJ45 connector), but they are . A poor RJ11 cable can cause frequent disconnections, lower sync rates, and noisy phone calls. In short, if your internet feels “slow” or “flaky” even after rebooting the router, the tiny phone cable hidden behind the modem could be the culprit.
If these steps confirm the cable is the culprit, a “better” replacement is almost certain to fix the issue. rj01311397 better
If you need to find a direct substitute that performs better than your current part: The RJ11 plug has between two and six gold contact pins