How to distinguish the RJ45&RJ11?

User Application Requirement
Updated 12-08-2020 06:44:22 AM 4322

RJ stands for Registered Jack.

RJ45

  • 8 Position
  • 8 Pin/Conductor (4/8 options)
  • Mainly used in network wiring.
  • 6mm * 11mm

       

           Figure 1: RJ45 connector (male)                                          Figure 2: RJ45 Jack (female)     

 

                                 Figure 6: RJ45-plug-jack-schematic

 

RJ11

  • 6 Position
  • 4 Pin/Conductor (2/4/6 options)
  • Used for telephone, and (ADSL/VDSL) modem, etc.
  • 6mm * 9.5mm

        

 Figure 4: RJ11 6P4C connector (male)                              Figure 5: RJ11 6P4C Jack (Female)

 

                                         Figure 3: RJ-11-plug-jack-schematic

 

 

RJ45&RJ11 ports on TP-Link Modem Router

                                    Figure 7: RJ11&RJ45 ports on TP-Link modem Router

 

The first 3 ports are RJ11 (6P6C/6P4C/6P2C) Jack. These ports are normally used with an RJ11 connector (telephone line).

The 4 yellow ports are RJ45 (8P8C/8P4C) Jack. These ports are normally used with an RJ45 connector (Ethernet cable).

 

Comparison:

Figure 8: RJ45&RJ11 Pairs                                    Figure 9: RJ11 in real            RJ45 in real    

   

Table 1: Comparison between RJ45&RJ11

Configuration

6P4C (6 positions, 4 conductors)

8P8C (8 positions, 8 conductors)

Usage

Phones, ADSL/VDSL lines, modem cables. RJ11 is mostly used for voice applications.

Computer networking. RJ45 is used in Ethernets or connecting cable/fiber modems or NBN box with Wi-Fi routers.

Bandwidth

RJ11 connectors can support about 100+Mbps

RJ45 connectors can support up to 10Gbps over Ethernet, provided the other equipment like network cables also support that speed.

Shape and size

Compact, square-shaped

Longer, more rectangular

 

 

Conclusion:

  • RJ45 is mostly used with Ethernet cables while RJ11 is connecting to telephone units.
  • RJ45 has 8 wires inside while Rj11 has 4 wires.
  • 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. It will not work by doing so and it might also damage the RJ45 port as power is being delivered by the telephone company into your handset that allows it to function even during a power outage.

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