Browse Prior Art Database

Phone Connector for IP Telephony

IP.com Disclosure Number: IPCOM000021162D
Original Publication Date: 2004-Jan-25
Included in the Prior Art Database: 2004-Jan-25
Document File: 2 page(s) / 56K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

In Sweden all phones are connected in series by four-pin-plugs with two In-pins and two Out-pins (Figure 1). The phone signal goes from the phone jack to the In-pin of the first telephone in line. If the handset is not off hook, it returns to the Out-pin of the phone plug and then to the next phone (Figure 2). To change from ordinary PSTN (Public Switched Telephone Network) to IP telephony, it is only necessary to cut the PSTN connection at the incoming wire pair of the first phone and replace it with an IP telephony access. This can be done using a standard 'piggyback' contact as is common with many devices like e.g. answering machines etc. All phones after the first one are then connected to the Ethernet as well (Figure 3). To find the first plug in line, the 'piggyback' plug can be equipped with a test device that generates a tone distinguishable from the dial tone. The user checks all other phones in the house whether this tone is reproduced. Phones that still display the dial tone are prior in line to the one the 'piggyback' device is connected to, and the device has to be connected there instead.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 75% of the total text.

Page 1 of 2

S

© SIEMENS AG 2004 file: ifx_2003J54572.doc page: 1

Phone Connector for IP Telephony

Idea: Mikael Hjelm, SE-Kista; Reino Johansson, SE-Kista

In Sweden all phones are connected in series by four-pin-plugs with two In-pins and two Out-pins (Figure 1). The phone signal goes from the phone jack to the In-pin of the first telephone in line. If the handset is not off hook, it returns to the Out-pin of the phone plug and then to the next phone (Figure
2). To change from ordinary PSTN (Public Switched Telephone Network) to IP telephony, it is only necessary to cut the PSTN connection at the incoming wire pair of the first phone and replace it with an IP telephony access. This can be done using a standard 'piggyback' contact as is common with many devices like e.g. answering machines etc. All phones after the first one are then connected to the Ethernet as well (Figure 3).

To find the first plug in line, the 'piggyback' plug can be equipped with a test device that generates a tone distinguishable from the dial tone. The user checks all other phones in the house whether this tone is reproduced. Phones that still display the dial tone are prior in line to the one the 'piggyback' device is connected to, and the device has to be connected there instead.

With the proposed method, most users can be enabled to change the telephone system single-handed without consulting an external technician. It therefore encourages the introduction of new phone systems like the IP telephony.

F...