Title:
電子交換機
Document Type and Number:
Japanese Patent JP3562419
Kind Code:
B2
Abstract:
A stored program controlled switching system is comprised of a first set of detachably mounted nonvolatile semiconductor memory devices such as memory cards for respectively storing data of different types including a control program, a second set of detachably mounted nonvolatile semiconductor memory devices for respectively storing the data of different types. A first controller is provided for operating the first set of memory devices in a working mode and the second set of memory devices in a standby mode, copying data from the memory devices of the working mode into a main memory and further into the memory devices of the standby mode, and performing a switchover between the operating modes when trouble occurs in the first set of memory devices. A second controller operates the switching system according to the data stored in the main memory.
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Inventors:
Nobuyuki Seguchi
Application Number:
JP2000024016A
Publication Date:
September 08, 2004
Filing Date:
February 01, 2000
Export Citation:
Assignee:
NEC
International Classes:
H04Q3/545; G06F11/20; H04M3/00; H04M3/24; H04M3/12; (IPC1-7): H04Q3/545; H04M3/00
Domestic Patent References:
| JP1309493A | ||||
| JP11085529A |
Attorney, Agent or Firm:
Umeo Yamauchi