What is the range of upstream frequencies used in telecommunications?

The range of upstream frequencies used in telecommunications refers to the frequency spectrum utilized for sending data from customer premises to the service provider. The correct range, 5-42 MHz, is primarily associated with traditional cable modem technologies, such as DOCSIS (Data Over Cable Service Interface Specification).

This frequency range allows for effective communication for upstream data transmission while ensuring compatibility with the existing infrastructure. The lower end of the spectrum begins at around 5 MHz, allowing devices to start transmitting data, while the upper limit is capped at approximately 42 MHz to prevent interference and maintain signal integrity over the coaxial cables.

In contrast, the other ranges presented do not align with the standard upstream frequency spectrum used in most telecommunications networks. The 10-50 MHz range, for instance, includes frequencies that exceed the typical upper limit used for upstream transmission in current DOCSIS standards. Similarly, the 50-200 MHz and 1-30 MHz ranges either extend beyond the necessary capacity for upstream data transmission or fall below the commonly used threshold, respectively, thereby making them unsuitable for this context.