Can 40G-SR and 40G-iSR optical modules communicate with each other?

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40G-SR and 40G-iSR optical modules provide similar features and can communicate with each other. They differ in the maximum transmit power. A 40G-iSR optical module has lower maximum transmit power than a 40G-SR optical module.
Compared to 40G-SR optical modules, 40G-iSR optical modules are more suitable for connecting to four 10GE-SR optical modules when 40GE ports are split into 10GE ports.

Other related questions:
What are the differences between 40G-SR and 40G-iSR optical modules
40G-SR and 40G-iSR optical modules provide similar features and can communicate with each other. They differ in the maximum transmit power. A 40G-iSR optical module has lower maximum transmit power than a 40G-SR optical module.

Compared to 40G-SR optical modules, 40G-iSR optical modules are more suitable for connecting to four 10GE-SR optical modules when 40GE ports are split into 10GE ports.


Differences in dispersion compensation between 40G coherent boards and 40G non-coherent boards
40G non-coherent boards use the TDC technology and the dispersion tolerance is 800 ps/nm. 40G coherent boards use the DSP technology and the dispersion tolerance reaches 60,000 ps/nm. A network deploying non-coherent boards must use DCMs for dispersion compensation. A network that uses only coherent boards does not need to use DCMs.

40G WDM OLP switching
1. For a 40G system (DQPSK/ODB), because the dispersion window of the 40G optical module is relatively narrow, the dispersion difference between the working and protection channels must be small and generally within ±100 ps/nm. 2. Currently, the LSXL boards all have built-in TDC modules on the live network. In this project, 12LSXL boards are delivered, and the dispersion compensation is ±800 ps/nm. In the Dispersion Compensation Management window, the Fine Tune Switch parameter is provided and is set to Enable by default. When a dispersion change is detected during the running, fine tuning is performed, which will not interrupt services. If the WDM detects the LOS or LOF alarm, it will start the TDC coarse adjustment, which will interrupt services for 1 minute (time taken by the board TDC to search for the dispersion value). 3. When a fiber cut triggers OLP protection switching and the LSXL board detects a LOS or LOF alarm, the TDC module starts the coarse adjustment, which will interrupt services for several minutes. This is because the coarse adjustment cannot be disabled for the TDC (the function of disabling the coarse adjustment is not provided on the NMS). During the switching, the coarse adjustment is started, interrupting services for several minutes. 4. Currently, the dispersion value is searched during OLP protection switching in a 40G system, which takes several minutes.

Whether OptiX OSN 8800 supports 40G optical wavelength conversion boards
Yes. OptiX OSN 8800 supports 40G optical wavelength conversion boards such as LSXL and LSQ.

Whether a 100G WDM system can use the optical-layer subracks for a 40G non-coherent system
Yes, but this hybrid transmission application needs to be evaluated based on network conditions.

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