Communications: electrical – Continuously variable indicating – With meter reading
Patent
1988-09-15
1990-10-30
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082504, 3408255, 34082552, 370 951, H04Q 100
Patent
active
049671936
ABSTRACT:
Digital loop carrier system having CPU to channel unit protocol. A method of communicating with the protocol is used in a telecommunication system having at least a central processing unit (CPU) connected to a plurality of digital interface units (DIU) via a communication module (CM). Each of the digital interface units is connected to a plurality of channel units (CU). The method has the steps of: sending from the CPU to the COM a command message having at least a first DIU address of a selected DIU of the plurality of DIU's, a channel address of a selected CU of the plurality of CU's, a second DIU address, the second DIU address being substantially identical to the first DIU address, and a first information portion; sending substantially the command message from the COM to the plurality of DIU's, the selected DIU receiving the command message; and in the selected DIU removing the first DIU address from the command message to form a modified message, and sending the modified message from the selected DIU to the plurality of CU's, the selected CU receiving the modified message. The selected module provides a response message to the CPU. The protocol provides a comprehensive response format which identifies the responding module, type of response, and if in error, who detected the error and type of error detected.
REFERENCES:
patent: 3906445 (1975-09-01), Beckmann et al.
patent: 4365331 (1982-12-01), Biba et al.
patent: 4654654 (1987-03-01), Butler et al.
patent: 4707828 (1987-11-01), Yamada
patent: 4712214 (1987-12-01), Meltzer et al.
Dyke Harry J.
Rattan Dev R.
Hamann H. F.
Holloway III Edwin C.
Patti C. B.
Rockwell International Corporation
Sewell V. L.
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