Jun 272017
 1. No lights when plugging into the switch
a. Modules are not compatible with the switch:   Result is that the switch does not allow the modules to work.  The brands may be incompatible:  For example Cisco modules do not work in a Juniper switch.
b. Modules is defective, the gold finger is scratched , causes the modules to not be able to supply the power normally,
c. TOSA is defective or damaged.
2. Modules can’t be identified or DDM info. is abnormal :
a. Modules not compatible with the switches:  Result is that the DDM info. can’t be read
b. I2C communication is abnomal:  The rate isn’t matched with the switches;
c. I2C pull-up resistor is missed:   Result is that the data can’t be transmitted correctly;
d. I2C program has problems, can’t match the customers’ switches.
3.  No Link with switches :
a. Modules can’t work with the switch:  The switch is not enabling the modules to work. 
b. Receiver optical power is too small or can’t be received:  Modules display RX_LOS can’t communicate:  Can be read via RX_PWR of DDM.  Some switches can display the alarm/ malfunction … working condition.
c.  Receiver overload because  bit error is too large to communicate:  Usually happens on the long distance modules, direct connecting  the modules with the patch cords , because the receiver rate is too large, and will damage the modules.
d. Modules is damaged:  Return back to the supplier to test. 
4. Modules have light, but the optical power is much lower than the standard data:
a. Optical fiber isn’t matched very well:  Re-plug the modules and test again;
b. Optical fiber transverse is damaged or dirty:  Replace the optical fiber and test again;
c. Using the wrong optical fiber, such as SM modules used as MMF.
d. Modules wavelength is different from the optical power meter.
 Posted by at 8:58 am Ethernet Cables & Fiber

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