Electronics and Telecommunications Research Institute

Korea Telecommunication Authority

Mi S Han

Moon Kyun Oh

Jae Seung Lee

Young Sun Kim

Seong Soon Joo

Seung Hee Kim

Pyung H Ye

Frame relay interworking service control method with ATM network using a permanent virtual connection

A method of controlling a television broadcasting call in an ATM switching system in which a television broadcasting service as one of B-ISDN services can be provided through an ATM switching network. The provision of the television broadcasting call in the ATM switching system is not performed by previously connecting all information transmission paths between a broadcasting source and a viewer (subscriber) but by connecting information transmission paths of the nearest switching modules between the broadcasting source and the viewer according to a requirement of the viewer under the condition that a semi-permanent connection is made between the broadcasting source and the ATM switching system. Therefore, the processing capability of the ATM switching system can be enhanced. The present invention can basically realize various B-ISDN services in the future.

Method of controlling television broadcasting call in asynchronous

A method of operating and maintaining the clock of the system for determining a reference clock of the system when starting an operation and maintenance processor (OMP), comprises the steps of: a first step of requesting and receiving a hardware clock from a network synchronizing processor (NSP); a second step of checking if the received hardware clock does not fall between a predetermined minimum and a predetermined maximum, and if so, providing an alarm message which requires an operator to provide information on a reference clock and if not, requesting reference clocks from all of the processors except an operation and maintenance processor (OMP); and a third step of comparing the hardware clock and the received reference clocks as many times as the number of the received reference clocks, and determining the hardware clock as a reference clock of the system if a difference is less than or equal to a predetermined time for more than the predetermined number of times and if not, providing an alarm message which requires the operator to provide information on a clock as necessary to determine the reference clock of the system.

Method for operating and maintaining a clock of a system

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Daejeon, South Korea

Mi S Han