FiberPlex WDM8 - Manual (Page 7)

Power Redundancy
In order to remain functional, even in the event of component failures, the WDM employs the following redundancies:
 Two power supply slots, with load equalizing and protection circuitry on the backplane. Each supply has thermal and overcurrent
protection.
 Each channel has its own independent power supply that runs off of the main power rails, so that a failure in one channel will leave
the others operational.
 There is a microprocessor in the unit, but its function is purely monitoring. If it fails, the data will continue to flow unimpeded on all
optical channels.
 There are two independent fan control channels, and two cooling fans on each side of the unit.
Differences between WDM16, WDM8A and WDM8B
The functional and physical characteristics of the WDM16, WDM8A and WDM8B are largely identical. The single differentiator is the number
of Active Wave Division channels and the associated internal wavelengths that are supported. The chassis dimensions and power supplies
remain identical.
The WDM16 supports all of the 16 standard CWDM wavelengths of 1310‐1610 nm, whereas the WDM8 units support only 8 of those
channels, so the installation can be scaled to the appropriate size. The WDM8A supports the upper 8 wavelengths 1470‐1610 nm and the
WDM8B supports the lower 8 wavelengths 1310‐1450 nm. Because of the enormously flexible active nature of the WDM16/8, the
wavelengths of the internal channels are basically invisible and even irrelevant to the end user. The reasons there are two subsets of
wavelengths supported through the WDM8A and WDM8B is for future expandability of the line in providing the possibility of add/drop,
combining and splitting capability.
When only 8 channel point to point functionality is desired, the WDM8A should be the model of choice.
Model Channels Internal Wavelengths
WDM16 16 1310‐1610 nm
WDM8A 8 1470‐1610 nm
WDM8B 8 1310‐1450 nm