What characteristic of WDM technology enables network scalability?

The characteristic of Wavelength Division Multiplexing (WDM) technology that enables network scalability is the ability to add more wavelengths. WDM allows multiple data signals to be transmitted simultaneously over a single optical fiber by assigning each signal a unique wavelength. This capability effectively increases the amount of data that can be sent through the fiber without needing to lay more cables.

As network demands grow, additional wavelengths can be introduced to accommodate increased traffic. This flexibility in scaling up the network infrastructure by simply adding more wavelengths means that systems can adapt to higher demand efficiently, without significant downtime or the need for extensive rewiring. This makes WDM an ideal solution for expanding networks as technology and data requirements evolve.

The other characteristics mentioned, such as support for long distances, standardized connector types, and integration with wireless networks, while important for various aspects of fiber optic transmission, do not directly contribute to the enhanced scalability of network capacity in the way that the ability to add more wavelengths does.