Circuit arrangement for telecommunications systems, particularly telephone switching systems, comprising an information interrogating device which cyclically drives inquiry locations

US4785298A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventor

• Herbert Jans · Schwanau, DE

Key dates

• Filing date: Jul 28, 1986
• Grant date: Nov 15, 1988
• Expiry date: Jul 28, 2006

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q3/72
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An interrogating device cyclically calling in an information from various inquiry locations controls the various inquiry locations differing in frequency to which end addresses of the inquiry locations are stored a different number of times in an interrogation control memory. When an interrogating device has not received any information upon interrogation of an inquiry location, then this inquiry location is skipped the next time. For this purpose, a note bit is stored in the interrogation control memory at the address which was just interrogated. When the same memory location in the interrogation memory is reached again after an interrogation cycle, the note bit effects that the address is not read and that the inquiry location is instead skipped once; the note bit is thereby erased in turn.