PABX common channel relay system
First Claim
1. A switching system comprising:
- (a) line or network interface circuits for connection to peripherals and trunks,(b) peripheral nodes for controlling groups of said line or network interface circuits,(c) a main control and switching means,(d) means for transmitting data between the peripheral nodes and the main control and switching means, including a high data rate bus connected therebetween,(e) means in the peripheral nodes for receiving data transmitted by the peripherals and/or trunks and for adding in said data an identifier of a line or network interface circuit port address of the peripheral or trunk transmitting source of said data,whereby the transmitting means can transmit said data with said port address to the control and switching means in order that the control and switching means can recognize the source of said data and route said data accordingly.
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Accused Products
Abstract
A high speed communication link between peripheral nodes and a single multi-link layer protocol (MLAP) controller with an integrated HDLC framer in a main control complex. Peripheral nodes contain a very simple control that forwards all the HDLC D-channel data from the peripherals to a single MLAP controller, thus making the peripheral nodes small in physical size, extremely flexible to connect to new interfaces and very portable. Accordingly it facilitates the efficient distributed deployment of the PABX. Using the described system, the PABX itself may be distributed around a building, using a backbone high speed link. Peripheral nodes may be located at various places in a building with peripherals such as line interfaces and associated digital telephones at locations as needed. They need not be centralized, adjacent the main control complex, as is now required. This facilitates the provision of a building with a flexible communication system having substantially reduced wiring requirements. The bit rate of transmission of HDLC formatted data is changed from 16 kb/s or 64 kb/s to 2.048 mb/s and visa versa. Plural modified HDLC packets are multiplexed to one physical link that is terminated by an HDLC framer inside the multi-link access protocol controller or, from one MLAP controller, many peripherals can be accessed and controlled. The functions of the present invention are transparent to the end-point HDLC framers and hence to the link layer protocol and peripheral software.
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Citations
17 Claims
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1. A switching system comprising:
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(a) line or network interface circuits for connection to peripherals and trunks, (b) peripheral nodes for controlling groups of said line or network interface circuits, (c) a main control and switching means, (d) means for transmitting data between the peripheral nodes and the main control and switching means, including a high data rate bus connected therebetween, (e) means in the peripheral nodes for receiving data transmitted by the peripherals and/or trunks and for adding in said data an identifier of a line or network interface circuit port address of the peripheral or trunk transmitting source of said data, whereby the transmitting means can transmit said data with said port address to the control and switching means in order that the control and switching means can recognize the source of said data and route said data accordingly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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- 13. A switching system comprising a main control and switching means, line or network interface circuits and peripheral nodes to which the line or network interface circuits are connected, means for transmitting data packets between the peripheral nodes and the central control and switching means, the peripheral nodes being physically located at a remote location relative to the central control and switching means, and a high speed serial data bus connecting the main control and switching means with the peripheral nodes and a single HDLC framer in the main control and switching means, and means for demultiplexing, multiplexing and arbitrating the reception and transmission of data from and to the high speed data bus to and from the HDLC framer.
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15. A common channel relay system comprising:
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(a) a PABX having a main control complex, (b) line or network interface circuits each for connection to a peripheral unit, (c) a multi-link access protocol (MLAP) controller controlled by the main control, (d) a packet relay controller in each peripheral node, for transmitting and receiving D-channel data to and from said peripheral units, (e) uplink and downlink digital communication links connected between the packet relay controllers and said MLAP controller for carrying said D-channel data, and (f) multiplexer-demultiplexer means in said MLAP controller for operating said links at a bit rate which is a multiple of the bit rate of said packet relay controllers, whereby said MLAP controller is shared between plural packet relay controllers. - View Dependent Claims (16, 17)
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Specification