Patent ID: 8913898

Claim:
A transceiver card for a telecommunications box for transmitting data over a first optical fiber and receiving data over a second optical fiber, the transceiver card comprising: a transmitter having a laser, a modulator, and a controller configured to receive input data and control the modulator to generate a first optical signal as a function of the input data; a fiber output optically connected to the transmitter and configured to optically connect the first optical fiber to the transceiver card; a receiver configured to receive a second optical signal from the second optical fiber and to convert the second optical signal to output data; fiber input optically connected to the receiver and configured to optically connect the second optical fiber to the transceiver card; and an energy level detector optically connected between the receiver and the fiber input to measure an energy level of the second optical signal, wherein the energy level detector includes a plurality of thresholds.