Browse Prior Art Database

Switch by using the pins of RJ45 Jack

IP.com Disclosure Number: IPCOM000014340D
Original Publication Date: 2001-Jan-01
Included in the Prior Art Database: 2003-Jun-19
Document File: 3 page(s) / 60K

Publishing Venue

IBM

Abstract

Disclosed is a device to recognize the RJ45 plug or the RJ11 plug inserted into RJ45 Jack automatically.

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Switch by using the pins of RJ45 Jack

   Disclosed is a device to recognize the RJ45 plug or the RJ11 plug inserted
into RJ45 Jack automatically.

RJ45 is a connector for LAN and RJ11 is a connector for Telephone
line.

RJ11 has 6 signal lines and RJ45 has 8 signal lines.
Because the RJ11 plug is smaller than the RJ45 plug, RJ45 Jack can
accept the RJ11 plug. (Fig1)

So, it is reported that there are many users who insert the RJ11
plug into RJ45 Jack by mistake. It is desired to have a method to
detect the miss insertion and prompt an warning message to the
user.

When the RJ45 plug is inserted in RJ45 Jack, all signal pins of
RJ45 Jack's signal pins enter the slot of RJ45 plug.

When the RJ11 plug is inserted in RJ45 Jack, six signal pins at
center of RJ45 Jack's signal pins enters the slot of RJ11 plug.
And two signal pins at both ends are pushed to the bottom and
placed by the RJ11 plug and RJ45 Jack as shown in Fig2.

It is possible to detect RJ11 being inserted by using two pins at
both ends of RJ45 signal pins.

The circuit is composed as shown in Fig3 to detect that RJ11 plug
is inserted.

When RJ11 plug is not inserted, the voltage of RJ11_IN_RJ45 is
high. And when RJ11 plug is inserted, the voltage of RJ11_IN_RJ45
is low.

It can be distinguished that the RJ11 plug was inserted detecting
the voltage of RJ11_IN_RJ45.

Application example:
The user is able to use modem and LAN by RJ45 jack that is
composed the circuit as shown in Fig4.

The switch drawn at the center of Fig4 is connected...