G - Physics – 06 – F
Patent
G - Physics
06
F
354/233
G06F 13/38 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1215472
- 43 - PLURAL COMMUNICATION CHANNEL PROTOCOL SUPPORT SYSTEMS Abstract Protocol support and message buffering circuitry is used to transmit call status, control and terminal management information bidirectionally over associated conductor pairs as signalling messages between a system processor and a phone and/or terminal served by the system and connected to each conductor pair. This information is transmitted serially in a modified HDLC format as a one bit signalling field of a multiplexed data frame. At each teransmitting end, the message information is converted from a parallel to a serial format, transmitting serially as the signalling bit of successive frames, and reconverted to parallel at the receiving end. Ports terminate the system end of the conductor pairs and are mounted four to the board. Each board contains circuitry, such as registers and the like, common to the signalling message protocol support and message buffering circuitry of all four ports. The processor means, reads and writes these common registers via the I/O bus to determine the status of each port and to exchange messages with the remote phones and terminals served by the ports. Multiplexing is used on the signalling message so that the system processor can direct a message individually to each of the plurality of station devices connected to the station end of each line. Protocol support is carried through to the processor to support the error detecting capabilities of the protocol.
464068
Peck Stephen R.
Sharp John B.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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