A sign is something other people, apart from the patient can detect, such as a swelling, rash, or change in skin color. A symptom is something only the patient feels and describes, such as a headache, fatigue, or dizziness. For the most part, the symptoms of HIV are the result of infections caused by bacteria, viruses, fungi and parasites.
Coarse wavelength-division multiplexing â cost-efficient transport in short-distance optical networks. CWDM is the technology of choice for cost-efficiently transporting large amounts of data traffic in telecom or enterprise networks. Optical networking and especially the use of CWDM technology has proven to be the most cost-efficient way of addressing this requirement.
FDM vs. FDMA. Frequency Division Multiplexing, or FDM, is a multiplexing technique for the physical layer that allows multiple low bandwidth signals to share the same high bandwidth frequency range.It is achieved by allocating a smaller frequency range to each signal that is using the same channel.ummary: 1. FDM is a physical layer multiplexing technique, while FDMA is a data link layer access method. 2. Using FDM to allow multiple users to utilize the same bandwidth is called FDMA.