Code division multiplexing,while using a fairly wide bandwidth of frequencies and a complex technology,is scalable like WDM.

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Code division multiplexing allows multiple users to share the same frequency band by assigning unique codes to each user's signal. This technology is scalable because adding more users to the network does not require additional frequency bandwidth, as each user can be assigned a unique code within the existing bandwidth. This makes it similar to Wavelength Division Multiplexing (WDM), which allows multiple signals to be transmitted simultaneously over different wavelengths of light in a single optical fiber.

Code Division Multiplexing,while Using a Fairly Wide Bandwidth of Frequencies