Method and telecommunications center for recognizing connection requests at a subscriber line

US6757378B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventor

• Paul Kunisch · Puchheim, DE

Key dates

• Filing date: Sep 7, 2000
• Grant date: Jun 29, 2004
• Expiry date: Jan 8, 2023

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M3/2272
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

In a circuit arrangement for recognizing connection requests at an analog subscriber line in which a number of subscriber terminal devices such as an analog telephone and an MSFM modem, are connected in parallel, set up and clear down connections are enabled independently of one another. For this purpose, a first threshold valve and a second threshold value are defined for the loop current in the subscriber line. A connection request can be respectively initiated by one of the subscriber terminal devices by means of closing its cradle switch. When the cradle switch of this first device is thus closed, the loop current exceeds the first threshold value, and when the cradle switch of a further device for initiating a connection request is also closed, the loop current exceeds the correspondingly defined second (higher) threshold value. As a result of these threshold value transgressions, the connection requests can be recognized and processed independently of one another.