Telephone switching system accommodating a plurality of line packages

• US 20050105514A1
• Filed: 11/16/2004
• Published: 05/19/2005
• Est. Priority Date: 11/17/2003
• Status: Active Grant

• Current Assignee: OKI Electric Industry Company Limited
• Original Assignee: OKI Electric Industry Company Limited
• Inventors: Usuba, Shinji, Kuboki, Hiroshi
• Granted Patent: US 7,706,354 B2
• Time in Patent Office: Days
• US Class Current: 370/356
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/1322 PBX
• CPC Class Codes: H04Q 2213/13332 Broadband, CATV, dynamic bandwidth allocation
• CPC Class Codes: H04Q 2213/13389 LAN, internet
• CPC Class Codes: H04Q 3/62 for connecting to private branch exchanges

Abstract

A telephone switching system includes line packages and a switch unit allowing a path to be established between the line packages. At least one line package is interconnected to, e.g. a broadband-adaptive unit, and is adaptive to both of a first coding rule expected of the switch unit and a second coding rule higher in compression ratio than the first coding rule. The broadband-adaptive line package, monitoring the coding rule of another line package connected thereto, adapts itself to the first coding rule if the other line package is adaptive only to the first coding rule, or adapts itself to the second coding rule if the other line package is adaptive to both of the first and second coding rules.

Claims

1. A telephone switching system comprising a plurality of line packages, and a switch unit allowing a path to be established between ones of said plurality of line packages, wherein

at least one of said plurality of line packages is a broadband-adaptive line package interconnected to a broadband network or a broadband-adaptive apparatus and adaptive to both of a first coding rule expected of said switch unit with respect to input data and a second coding rule having a higher compression ratio for coding than the first coding rule,

at least said broadband-adaptive line package comprising a setting circuit for monitoring a coding rule of another of said plurality of line packages, which is connected to said broadband-adaptive line package via said switch unit, on a basis of information received via said switch unit,

said setting circuit conditioning, if said other line package is adaptive only to the first coding rule, said setting circuit for the first coding rule, and, if said other line package is adaptive to both of the first coding rule and the second coding rule, said setting circuit for the second coding rule.

2. The system in accordance with claim 1, wherein said broadband-adaptive line package further comprises a first coding rule information sender for sending out information indicative of adaptability of said broadband-adaptive line package to both of the first coding rule and the second coding rule,

said first coding rule information sender inserting, if an idle band is available in a highway slot of said switch unit, the information into the idle band to send out the information.

3. The system in accordance with claim 1, wherein said broadband-adaptive line package further comprises a second coding rule information sender for sending out information indicative of adaptability of said broadband-adaptive line package to both of the first coding rule and the second coding rule,

said second coding rule information sender periodically stealing, if an idle band is not available in a highway slot of said switch unit, one bit located at a predetermined position on the highway slot and inserting the information into the predetermined position to send out the information.

4. The system in accordance with claim 3, wherein the information to be sent out is formed in a multi-frame pattern.