| 摘要 |
PROBLEM TO BE SOLVED: To provide the analog video phone system in which the software is up-graded interactively while making dynamic image and audio communication. SOLUTION: In a maintenance center side analog video phone A, a system control section 5 makes an area allocation revision request and an up-grade request to a multiplex control section 10 and an up-grade control section 9 and an area allocation revision request is made to the multiplex control section 10 after up-grade confirmation notice. The up-grade control section 9 transfers up-grade data sequentially to the multiplex control section 10 to make up-grade confirmation at the end of transfer. The multiplex control section 10 sends an adaptive multiplex table number and a software up-grade based on the area allocation revision request, sends up-grade data by the data transfer request to make up-grade interactively. |
