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Environment/Versions Spirent TestCenter CV-10G-S8 Answer Spirent TestCenter works according to IEEE standards. The IEEE Ethernet standards make use of a feature called 'Link Integrity' to ensure that the physical cable being used to transmit/receive data is intact. Devices to detect the presence of a connection to another device is based on pulses. These connection present pulses are sent by Ethernet devices when they are not sending or receiving any frames. These pulses are called link integrity test (LIT) pulses. In the case of twisted pair Ethernet, Link is a signal sent by the transmitter electronics when the cable is not in use. If no Link Integrity Test is received, the Link is assumed to be lost. With fiber based Ethernet, Link Integrity is monitored in one of two ways: If the light received is above the receiver sensitivity threshold, Link Integrity is good. During the period when the transmitter is not sending data, transmitter will send a link pulse down the cable.     If this link pulse is above the receiver sensitivity threshold when it is received, Link Integrity is good.