Circuit for CCIS data transfer between a CPU and a plurality of

Details Circuit for CCIS data transfer between a CPU and a plurality of Circuit for CCIS data transfer between a CPU and a plurality of

1985-12-02

1987-12-15

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 900

Patent

active

047137932

ABSTRACT:
Simplified CCIS (Common Channel Interoffice Signalling) data transfer circuitry is shown for transmitting data between a CCIS central processing unit of a central switching office and a number of terminal equipment controllers, each having a local CPU. The terminal equipment controller operates such equipment as modems of various speed, digital trunks or T1 spans. This design minimizes the amount of circuitry required to transmit CCIS data between central processing units, thereby permitting a more reliable design. This circuit provides a minimal amount of logic required for interprocessor communication. In addition, this circuit minimizes the amount of real time required by each CPU to perform the CCIS data transfer.

REFERENCES:
patent: 4003033 (1977-01-01), O'Keefe et al.
patent: 4156277 (1979-05-01), Seitz et al.
patent: 4303990 (1981-12-01), Seipp
patent: 4466062 (1984-08-01), Krikor
patent: 4628505 (1986-12-01), Paris

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