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Why is the on-site transmission distance lower than the optical transceiver index, but the link fails?
The transmission distance of the optical transceiver mainly depends on the optical transmission power of the transmitter and the receiving sensitivity of the receiver. The difference between the two is the allowable fiber attenuation. Generally, the nominal transmission distance of the optical transceiver is determined.
The transmission distance refers to the distance under normal fiber attenuation, normal fusion, normal insertion loss and other factors. If it is found that the on-site optical cable distance is less than the nominal distance, but the optical transceiver shows that the link is not
First, use the optical power meter to measure the optical output power of the transmitter or receiver, if it is normal, then measure the optical power after transmission through the optical fiber at the opposite end, if the total attenuation of the optical fiber exceeds
Attenuation tolerance, the receiver or transmitter will show that the link is unreachable and there is no signal output. In this case, you can re-splicing the field optical cable, adjusting the bend of the optical cable, and scrubbing the pigtail.
Connectors and other measures to reduce the amount of attenuation.
Why sometimes the forward video transmission is normal, but the reverse data transmission is not normal?
The wavelength used by the normal 1-channel video + 1-channel reverse data optical transceiver is 1310nm/1550m, but the receiving sensitivity of the receiver to 1310m light is higher than that of the transmitter to 1550nm light.
Receiving sensitivity, therefore, sometimes the forward video transmission is normal, but the reverse data transmission is abnormal. This phenomenon mostly occurs when the field fiber attenuation is in a critical state.
In this case, the attenuation can be reduced by re-splicing the field optical cable, adjusting the bending degree of the optical cable, and scrubbing the pigtail connector.
There is no unified interface standard and signal standard for the access control intercom signal, which are all customized by the manufacturer. Therefore, if the forbidden signal needs to be transmitted remotely through optical fiber, the manufacturer of the access control intercom equipment must provide its signal and signal. interface parameters.