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Dynamically Reconfigurable Integrated Switch

IP.com Disclosure Number: IPCOM000061592D
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 3 page(s) / 73K

Publishing Venue

IBM

Related People

Dias, DM: AUTHOR [+4]

Abstract

A reconfigurable integrated switch (RIS) is designed to simultaneously support multiple networks of different types, including token ring networks, time division multiplexed (TDB) buses and point-to-point links. The networks can be reconfigured dynamically, i.e., a switch controller can drop a switch port from one network and then insert it into another network. The network is integrated in that support of the different types of networks facilitates carrying different traffic types simultaneously. BASIC SCHEME The basic configuration is shown in Fig. 1. The system consists of a switching matrix, a switch controller, and adapters that connect external devices or networks to the switching matrix. The internal structure of the switching matrix is shown in Fig. 2.

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Dynamically Reconfigurable Integrated Switch

A reconfigurable integrated switch (RIS) is designed to simultaneously support multiple networks of different types, including token ring networks, time division multiplexed (TDB) buses and point-to-point links. The networks can be reconfigured dynamically, i.e., a switch controller can drop a switch port from one network and then insert it into another network. The network is integrated in that support of the different types of networks facilitates carrying different traffic types simultaneously. BASIC SCHEME The basic configuration is shown in Fig. 1. The system consists of a switching matrix, a switch controller, and adapters that connect external devices or networks to the switching matrix. The internal structure of the switching matrix is shown in Fig. 2. The switching matrix consists of a set of buses or internal rings (horizontal lines), and vertical lines which are connected to port adapters. These vertical lines can be connected to the buses or rings by pass transistors that can be switched on (low impedance) or off (high impedance) by a control line. Each horizontal line (ring or bus) has switches between adjacent vertical lines (shown in Fig.2 as pass transistors). The pass transistors can be switched by the switch controller if centralized control is used to manage information transfer, or by the port adapters when distributed control is possible. The RIS is configured by switching these pass transistors on or off, as described below. Fig. 3 shows how a horizontal line is configured to operate as a ring. For this mode, each (ring) adapter is connected to two vertical lines. For each such adapter to be switched into a ring, the series switches in each horizontal line (marked A in Fig.3) are turned off and the switches connecting the vertical adapter lines to this horizontal ring line (marked B in Fig.3) are turned on. Thus, all adapters switched into a ring are connected in series to one another, and the ring is completed by an internal path in the switch matrix as shown in the figure. Adapters not connected to a particular ring are bypassed by turning on the corresponding horizontal line switches (A) and turning off the tap switches (B) to that adapter. These connections are made by signals sent to the control points of the pass transistors from the centralized controller. Multiple rings can be configured within the switching matrix, as indicated in Fig.3. Adapters can be dynamically connected and disconnected from any of these rings by setting the appropriate switches (through the controller). Each ring so created can be operated in different ways. One mode of operation is as a token ring network. In this mode, each adapter implements a token ring protocol, perhaps that of the IEEE 802.5. To initially connect a port to a specific ring, a connection request is made by the port adapter to the controller, that sets the appropriate switches (pass transistors). When such an adap...