Communications network tap with heartbeat monitor

Details Communications network tap with heartbeat monitor Communications network tap with heartbeat monitor

2005-07-01

2009-10-06

Pham, Chi H (Department: 2416)

Multiplex communications

Diagnostic testing

Fault detection

C370S248000, C714S048000, C714S703000, C714S799000, C714S715000

Reexamination Certificate

active

07599301

ABSTRACT:
A communications network tap, comprises a first terminal and a second terminal adapted to couple the tap in-line in the network and communicate data packets with network devices. A heartbeat generator is configured to generate a heartbeat signal, and a heartbeat insert circuit coupled to the first terminal and the heartbeat generator and configured to insert the heartbeat signal into data packets. A third terminal is coupled to the heartbeat insert circuit and adapted to couple the tap to a network monitor and communicate data packets with network monitor. A heartbeat remove circuit is coupled to the third terminal and configured to receive data packets from a network monitor and remove the heartbeat signal from the data packets. A heartbeat detector coupled to the heartbeat remove circuit and configured to detect whether the data packets include the heartbeat signal, and if not, to generate an alarm signal. A switch is coupled to the second terminal and configured to transmit data packets onto the network. Advantages of the invention include ensuring the integrity of network monitoring equipment.

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