8 difference between RJ11 and RJ45 port.
8 difference between RJ11 and RJ45 port. - Table of contents:
The RJ45 crystal head and RJ11 crystal head are different in size, wiring standard and application range. The two are not interoperable, so you should pay special attention when using them.
What is RJ11?
RJ11 as discussed before was widely used in analog telephony to connect the phone instrument and the cable. Now it is mostly used to connect to modems and is still used in landlines. It is a 4-slot connector and has six pins, which means you cannot fit it into an RJ45 slot. It is used in PSTN telephone lines to connect telephone cables which are technically different from Ethernet cables.
What is RJ45?
Unlike RJ11, these connectors are used for both telecom and data networks. RJ-45 connectors have 8 pins and these are typically used to connect Ethernet cables to a switch or serial data modem. You would commonly find switches with RJ45 connectors in copper cable networks. Some switches have RJ45 as well as SFP fiber ports and hence these can be used in fiber networks as well. So, these are typically used for data communication networks where IP voice telephony may also be there.
The difference between RJ45 and RJ11 Port
1. Physical appearance:
The primary difference lies in their physical appearance, wherein the RJ45 connector is broader than RJ 11 and has 8 pins. RJ112 has 6 pins and a narrow plugging end. Their pin colors are different as well.
Since RJ 45 is used in data communication networks using Ethernet cables, it supports 10Gbps bandwidth. This can be further extended using fiber optics such as a fiber cable and a fiber media converter. RJ11 support just 24Mbps bandwidth.
3. Position and contact:
Since RJ45 has 8 pins and connecting ports, it is called 8P8C. On the same lines, RJ11 is called 6P4C.
4. Cable type:
RJ45 connectors commonly connect to Cat5 and Cat6 cables, while RJ11 simply connects to a telephone cable.
5. Device connectivity:
RJ45 can connect to various devices in a copper cable network such as switches, cables, touch desktop computer, routers, and so on.
6. Sockets and ports:
Switches with RJ11 connectors comprise mainly two sockets for a 2-line telephone system. On the other hand, switches with RJ45 connectors are of various types such as managed switches or unmanaged network switches with 4,5, 8, 10, or even 20 ports.
Some switches support fiber connections as well and hence have SFP+ ports on one end and RJ45 on the other. The number of ports may vary.
RJ45 connectors are definitely more flexible than RJ11. One cannot connect an RJ11 connector to an RJ45-compatible device, port, or interface; however, RJ45 connectors are backward compatible and suitable for RJ11-based analog telephony devices.
8. Shape and size:
RJ11 connectors are square-shaped and typically small and compact. RJ45 connectors are long and mostly rectangular. Also, they need to accommodate more wires than the former.
RJ45 and RJ11 are the most widely used registered jacks. An RJ45 is used for Ethernet applications whereas RJ11 is specifically used in telephonic networks. The RJ11 connector can easily plug into the RJ45 jack. But it is not widely practiced due to power delivery issues.
RJ45 is bigger in size than RJ11. You cannot plug in the RJ45 cable connector into an RJ11 jack/interface/port/slot, however, you can do the opposite.
Plugging an RJ11 cable into an RJ45 jack/interface/port/slot is the most common mistake that might happen.