Solved: Understanding TX RX light level
When we see a Rx power around -14 dBm or lower there is typically some sort of fault in the cable plant (bad splice, dirty connector, poorly seated jumper etc.) that''s causing excessive
Optical module input power negative
A negative input power reading in dBm is normal and indicates that the received optical power is less than 1 milliwatt, which is typical for fiber optic systems.What Negative dBm MeansOptical power in fiber optics is commonly measured in dBm, where 0 dBm corresponds to 1 milliwatt of power. A negative dBm value simply means the optical power is less than 1 milliwatt. For example, -3 dBm corresponds to approximately 0.5 milliwatts, and -10 dBm corresponds to 0.1 milliwatts. Negative values are standard in optical communication because the transmitted and received powers are usually in the milliwatt or sub-milliwatt range .Typical Input Power RangesThe input power of an optical module refers to the optical power received at the module's photodetector. Each module has a specified receiving sensitivity range, usually expressed in dBm, which defines the minimum and maximum optical power it can handle while maintaining proper operation . For example:A typical single-mode module may operate correctly with input powers from around -27 dBm to -3 dBm .Values below the minimum sensitivity (e.g., below -27 dBm) can cause intermittent connectivity or increased bit error rates.Values above the maximum (overload power) can saturate the photodetector and potentially damage the module .Causes of Low Input PowerIf the input power is negative but within the acceptable range, it is normal. However, if it is too low, possible causes include:Fiber attenuation due to long distances or poor-quality fiber.Connector or splice losses.Dirty or contaminated optical module bores .Excessive bending or stress on the fiber .Troubleshooting TipsCheck the fiber connectors and clean them if necessary.Inspect the fiber path for bends, breaks, or damage.Compare with the module's datasheet to ensure the input power is within the specified range.Test with another optical module to rule out a faulty transceiver .Key TakeawayA negative input power reading in dBm is normal and expected in fiber optic systems. The critical factor is whether the value falls within the module's specified receiving range. Values too low or too high can affect performance, but a negative dBm value itself does not indicate a problem .
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Solved: Understanding TX RX light level
Solved: Hi, I hope someone could please help clarify TX and RX light level. This is the information i got from the CLI of cisco router: Optical Optical Temperature Voltage Current Tx Power
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