Data networks
First Claim
1. A transceiver for coupling a terminal to a local area network across first and second data links, comprising:
- a first pod for connection to the first data link and a second port for connection to the second data link to couple both the first and second ports to the local area network;
a switch unit, having a first state providing for communication between the terminal and the first port for receiving and transmitting data signals on the local area network, and a second state providing for communication between the terminal and the second port for receiving and transmitting data signals on the local area network; and
a monitoring circuit, coupled to the switch unit and the first and second ports which detects a current state of the switch unit, and conditions of the transceiver, including transmission of data signals through the transceiver, and the presence or not of data signals from the network on the first and second ports, and controls the switch unit in response to the current state of the switch unit and the detected conditions of the transceiver.
3 Assignments
0 Petitions
Accused Products
Abstract
A LAN or other data network includes at least first and second repeater units for receiving data signals and repeating them to other parts of the data network and a transceiver unit for transmitting and receiving data which is connected to the first repeater unit by a primary data link and to the second repeater unit by a secondary data link. The primary data link comprises a primary transmit line for transmitting data from the transceiver unit to the first repeater unit and a primary receive line for receiving data from the first repeater unit and transmitting it to the transceiver unit; and the secondary data link comprising a secondary transmit line for transmitting data to the second repeater unit and a secondary receive line for receiving data from the second repeater unit and transmitting it to the transceiver unit. Intelligent monitoring means determines whether or not the transceiver unit is transmitting data and also whether or not data signals are present on each of the primary receive line and the secondary receive line and accordingly controls a switch unit to switch between two states in which either the primary transmit and receive lines or the secondary transmit and receive lines, but not both, are in communication with the transceiver unit. Both transmit and receive faults can be detected and appropriate action to avoid them taken.
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Citations
10 Claims
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1. A transceiver for coupling a terminal to a local area network across first and second data links, comprising:
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a first pod for connection to the first data link and a second port for connection to the second data link to couple both the first and second ports to the local area network; a switch unit, having a first state providing for communication between the terminal and the first port for receiving and transmitting data signals on the local area network, and a second state providing for communication between the terminal and the second port for receiving and transmitting data signals on the local area network; and a monitoring circuit, coupled to the switch unit and the first and second ports which detects a current state of the switch unit, and conditions of the transceiver, including transmission of data signals through the transceiver, and the presence or not of data signals from the network on the first and second ports, and controls the switch unit in response to the current state of the switch unit and the detected conditions of the transceiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification