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When I use inward loopback (Framer or Driver) option why does the CARRIER LOSS indication remains RED?

April 26, 2017driver framer indication inward loopback loss option red remains

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When I use inward loopback (Framer or Driver) option why does the CARRIER LOSS indication remains RED?

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The “Inward loopback (D/F)” is typically used to loopback the data of the transmitter. The term “transmit” refers to the data from the PC. The term “receive” refers to the data towards the PC. The CARRIER LOSS indicates that the incoming data has more than 128 consecutive zeros. This typically occurs when there is no signal applied. • When in “Inward loopback (D/F)” and no signal is applied to the receiver input, the CARRIER LOSS will illuminate (RED). The alarm can be ignored since the data that we are concerned with is being looped back from the transmitter. • When in “Inward loopback (D/F)” and a signal is applied to the receiver input, the CARRIER LOSS will illuminate (GREEN), indicating there is a valid input signal. Again, this can be ignored since this signal is not of interest. When the unit is in “No Loopback”, the unit should function properly with the received incoming data.