Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1995-08-11
1997-02-25
Safourek, Benedict V.
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
395872, 370412, H04L 1254
Patent
active
056065590
ABSTRACT:
An ATM communications network includes a system processor having a device driver and a memory coupled to an adapter at an interface. Frames stored in the memory are transmitted to the network using a transmit ready queue residing in the adapter and defined by transmit control registers. The frames are linked together by descriptors and pointers to received ready lists maintained by the device driver. A transmit frame complete list is established in the system memory using the transmit control registers. An interrupt is generated by the adapter indicating when frame transmission is complete. Simultaneously, cells are received from the network and stored in system memory according to a free buffer list established by the device driver. A pointer is maintained by the device driver to the last entry of the receive free buffer list. The adapter maintains a pointer to the next buffer to be used from the receive free buffer list. A receive ready list is established by the device driver in system memory with the location indicated to the adapter via the receive control registers in the adapter. The receive data cells are reassembled into frames in buffers from the free buffer list. At completion of a received frame, the frame is added to an appropriate receive ready list. An interrupt is generated to the processor by the adapter when one or more completed frames reside on the receive ready list for transmission to the network.
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Badger Ryan L.
Barker Kenneth J.
Nichols Paul H.
Schroter Russell E.
Stacy John K.
International Business Machines - Corporation
Phillips Steven B.
Redmond Joseph C.
Safourek Benedict V.
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