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RJ11 RJ14 RJ45 RJ48-difference between RJ11,RJ14,RJ45,RJ48

This page compares RJ11 vs RJ14 vs RJ45 vs RJ48 and mentions difference between RJ11, RJ14, RJ45 and RJ48. They are used as plug.

RJ11 connector

Used as telephone Plug. It is used as physical interface to terminate telephone wires. This RJ-11 connector has 6 positions in which 4 are installed. The pins are 2,3,4 and 5. It mainly uses 2 wires for connection i.e. 2 and 5. It is used to connect one telephone. It uses 6P4C & 6P2C connector types. Following table mentions RJ11 pin descriptions.

RJ11 pin number Description
1 No connection (NC)
2 RD
3 GND
4 NC
5 TD
6 NC

RJ11 pin details for RS232, RS422 and RS485 connections

RJ11 pin number Description
1 RTS output
2 TX+ output
3 GND (for RS232), (TX- for RS422/RS485)
4 GND (for RS232), (RX- for RS422/RS485)
5 RX+ input
6 CD input

RJ11 vs RJ14

RJ14 connector

This RJ-14 connector has 6 positions in which 4 are installed. The pins are 2,3,4 and 5. It is used for connection to two analog telephone lines. It uses 4 wires for connection. It is used to connect two telephones. It uses 6P4C connector type. Following table mentions RJ14 pin descriptions.

RJ14 pin number Description
1 Unused
2 Tip-2
3 Ring-1
4 Tip-1
5 Ring-2
6 Unused

Figure-1 mentions pin details of RJ11 vs RJ14 connector types used to interface analog voice lines.

RJ45 connector

Used as data plug. It uses 8P8C (8 position 8 contact) connector type. Following table mentions RJ45 pin descriptions.

RJ45 pin number Description
as per T568-A
Description
as per T568-B
1 Receive Data+ (white/ green) Transmit Data+ (White/orange)
2 Receive Data- (green) Transmit Data- (orange)
3 Transmit Data+ (white/orange) Receive Data+ (white/green)
4 Not used (blue) Not used (blue)
5 Not used (white/blue) Not used (white/blue)
6 Transmit Data- (orange) Receive Data- (green)
7 Not used (White/brown) Not used (white/brown)
8 Not used (brown) Not used (brown)

RJ48 connector

It uses 8P8C (8 position 8 contact) connector type. It is used for connecting T1, E1 and J1 lines. In cross over cable between RJ48 to RJ48 do connections as follows:
1 - 4
2 - 5
4 - 1
5 - 2
In straight cable between RJ48 to RJ48 do connections as follows:
1 - 1
2 - 2
4 - 4
5 - 5
Following table mentions RJ48 pin descriptions.

RJ48 pin number Description
1 RX/Ring/-
2 RX/Tip/+
3 Not connected
4 TX/Ring/-
5 TX/Tip/+
6 Not connected
7 Not connected
8 Not connected

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