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.
Where frequency-division multiplexing is used as to allow multiple users to share a physical communications channel, it is called frequency-division multiple access (FDMA). FDMA is the traditional way of separating radio signals from different transmitters.