摘要:
Apparatus is disclosed for automatically configuring network media connections of end node interfaces as well as node interfaces that operate as a hub, a switch or a repeater in a Local Area Network. The apparatus utilizes a pseudo-random sequencer to prevent lock step operation whereby the connections cannot be properly configured.
摘要:
Apparatus is disclosed for automatically configuring network media connections of end node interfaces as well as node interfaces that operate as a hub, a switch or a repeater in a Local Area Network. The apparatus utilizes a pseudo-random sequencer to prevent lock step operation whereby the connections cannot be properly configured.
摘要:
A method and system for initiating selective flow control within a network multiplexer. Each port of a network multiplexer is associated with high and low threshold values, as well as a list of indications of ports that have requested the port to initiate flow control and a list of indications of ports which the port has requested to initiate flow control. A port that, by queuing a message descriptor to the transmit queue of a destination port, causes the number of message descriptors queued to the transmit queue of a destination port to equal or exceed its high threshold, is flow controlled by the destination port. When the number of message descriptors queued to the transmit queue of a destination port that previously equaled or exceeded the high threshold falls below the low threshold, all ports flow controlled by the destination ports are released from flow control.
摘要:
A configuration apparatus for network devices. A plurality of LEDS on the front panel of a network device has a primary mode, displaying device and port status. These LEDS are grouped in a matrix, consisting of pairs of LEDS arranged in a plurality of parallel columns. Textual information may be provided adjacent each of the pairs, to describe an associated secondary mode, for configuration of the features and operational states of the device. When a configuration switch and mode control circuitry are enabled, drivers for the LEDS are disconnected from the ports. A configuration cycle is initiated, during which at least some of the LEDS provide visual cues to the user for carrying out the configuration operations. Sequential and unison blinking of the LEDS, as a group, individually, and in pairs, confirms reconfiguration opportunity, selection, and execution, for each secondary function.
摘要:
A processor performs data transactions. For a first data transfer between the processor and a first external device which uses non-multiplexed data transactions, a first address is placed on an (external) address bus and first data is transferred on an (external) address/data bus. A second data transaction is performed between the processor and a second external device which uses multiplexed data transactions. In an address phase of the second data transaction, a second address is placed on the address/data bus. In a data phase of the second transaction, second data is transferred on the address/data bus.
摘要:
A method and system for initiating selective flow control within a network multiplexer. Each port of a network multiplexer is associated with high and low threshold values, as well as a list of indications of ports that have requested the port to initiate flow control and a list of indications of ports which the port has requested to initiate flow control. A port that, by queuing a message descriptor to the transmit queue of a destination port, causes the number of message descriptors queued to the transmit queue of a destination port to equal or exceed its high threshold, is flow controlled by the destination port. When the number of message descriptors queued to the transmit queue of a destination port that previously equaled or exceeded the high threshold falls below the low threshold, all ports flow controlled by the destination ports are released from flow control.
摘要:
A dual channel 100Base-T link for use between devices in a computer network system. The IEEE 802.3 standard for bus network systems calls for a device interconnection cable which includes four twisted pairs of wire. For 10BaseT and 100Base-T systems, the 802.3 standard specifies the use of only two of the four pairs. The present link includes a special Media Access Controller having dual channel interconnections, and primary and secondary Media Independent Interfaces and Physical Layers. This provides first and second communication channels which are parallel, but cooperating. The second channel is connected to the normally unused two pairs in the cable, effectively doubling the bandwidth of the link without running a new cable.
摘要:
A method and system for preventing the transmission of stale communications packets by a network multiplexer. Common network hardware and protocol specifications require that communications delayed in transit through a network multiplexer must be discarded after a specified period of time. The method and system employ single bit flags within transmit queue entries to flag queue entries that become stale due to the passage of time while communications packets received by a network multiplexer are stored within the network multiplexer for subsequent transmission. A global clock within the network multiplexer invokes a transmit queue monitoring function at one-second intervals. The transmit queue monitoring function discards queue entries having single bit flag values of “1,” and sets the bit flag values of the remaining queue entries to “1”. In this manner, queue entries are discarded after residing within the queue for between slightly more than one second and slightly less than two seconds. Known queue entries can reside in the queue for two seconds or longer.
摘要:
A multi-segment repeater includes a first inter-repeater bus and a second inter-repeater bus. A first repeater circuit is connected to the first inter-repeater bus and to the second inter-repeater bus. The first repeater circuit includes a 10 megabit repeater core, and one or more 100 megabit repeater cores. A selector selects which of the repeater cores is to be connected to the first inter-repeater bus. Additionally, provision is made to allow a 100 megabit repeater core to be connected to the second inter-repeater bus.
摘要:
A combination of a standardized high speed switch interconnect scheme and global management makes a stack of multiple switches appear as one large managed high speed switch without impeding the transmission of information between individual switches within the managed switch, thereby providing a high speed connection between networking devices. Standard two port PCI bridges are interconnected such that an apparent three port bridge is created. This allows a transaction between systems to occur without interrupting intermediate systems. By logically connecting the PCI bus of one system to that of another, a processor in one system is allowed to access all devices in all the systems that are connected in the stack. In this way only one processor or management entity is required to configure and control a group of stacked systems.