US 6,748,552 B2 · Stored program controlled switching system

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.

Claims16

Dependent claims

A stored program controlled switching system comprising:

a first set of detachably mounted nonvolatile semiconductor memory devices for respectively storing data of different types including a control program;
a second set of detachably mounted nonvolatile semiconductor memory devices for respectively storing said data of different types;
a main memory;
a first controller for operating said first set of memory devices in a working mode and operating said second set of memory devices in a standby mode, copying data from the memory devices of the working mode into said main memory and into the memory devices of said standby mode, and performing a switchover between said operating modes when trouble occurs in said first set of memory devices;
and
a second controller for operating the switching system according to the data stored in said main memory.

3 more elements

A stored program controlled switching system comprising:

a first storage unit including a set of slots and a first set of nonvolatile semiconductor memory cards detachably respectively mounted in said slots, each of said memory cards storing data of a different type, one of the memory cards storing a control program;
a second storage unit including a set of slots and a second set of nonvolatile semiconductor memory cards detachably respectively mounted in said slots;
a main memory;
a first controller for operating said first set of memory cards in a working mode and operating said second set of memory cards in a standby mode, copying data from the memory cards of the working mode into said main memory and into the memory cards of said standby mode, and performing a switchover between said operating modes when trouble occurs in said first set of memory cards;
and
a second controller for operating the switching system according to the data stored in said main memory.

3 more elements

Dependencies are inferred from the claim text.

Stored program controlled switching system

Life of this patent

Stored program controlled switching system

Life of this patent

Abstract

Claims16