Inter-module interconnect for simultaneous use with distributed

Details Inter-module interconnect for simultaneous use with distributed Inter-module interconnect for simultaneous use with distributed

1994-07-01

1997-07-15

Olms, Douglas W.

Multiplex communications

Channel assignment techniques

Carrier sense multiple access

H04L 12413

Patent

active

056489595

ABSTRACT:
A network hub for interconnection of modular devices, such as Ethernet repeaters, bridges, and routers is provided. Such a network hub efficiently interconnects the modular devices to each other. The inter-module connection is not through standard Ethernet media cabling or interconnections so that the hop count does not exceed one for all external connections, as defined by IEEE 802.3 Repeater Specification. Timing synchronization is provided by a global synchronization mechanism. Collision detection is provided by a series of lines that distribute the collision to all modules connected to the hub. The network hub comprises an inter-module bus having a backplane, the backplane able to connect to a number of modules, a clock, a method for transmitting data received by a first module across the inter-module bus to a second module and transmitting the data to ports of the second module, and a method for synchronizing the data as it is transmitted by the second module to the clock within the hub. With such an arrangement, timing of the data transfers and state exchanges on the inter-module connection are such that all state and timing specifications of the IEEE 802.3 repeater specification are satisfied for all ports on all repeater modules and all stations.

REFERENCES:
patent: 5301303 (1994-04-01), Abraham et al.
patent: 5337310 (1994-08-01), Selyutin
patent: 5339313 (1994-08-01), Ben-Michael et al.
Ethernet/IEEE 802.3 1992 Network Data Book, Advanced Micro Devices, pp. 1-229 to 1-241.

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