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What do you call a fiber optic cable in which the light signals follow a single path?
Baseband systems use digital signaling over a single channel. Signals flow in the form of discrete pulses of electricity or light. Figure 2.19 shows a baseband transmission with a bidirectional digital wave. With baseband transmission, the entire communication channel capacity is used to transmit a single data signal. The digital signal uses the complete bandwidth of the cable, which constitutes a single channel. The termbandwidthrefers to the data transfer capacity, or speed of transmission, of a digital communications system as measured in bits per second (bps).
Is the single chip in digital thermometer is example of embedded computer?
yes
What is the FAA common digitizer 2?
The Common Digitizer 2, also known as the CD-2, is an electronic computer that takes raw (analog) siginals from a search radar and a beacon radar system (thus the term 'common') and digitizer the analog information into a digital format. It then places the information into 'tracks' (i.e., range, bearing, altitude, and aircraft ID) and sends this information to FAA Air Traffic Control Centers (also know as Air Route Traffic Control Centers - "ARTCC") for display to air traffice controllers. The CD-2 is a second generation of digitizer being that it was a dual channel device that offered redundancy in case of a single channel failure. It's predicessor was called "Common Digitizer" (CD), it did the same job but was only a single channel, thus when it failed the ARTCC was without aircraft display input.
802.11a channels are full duplex or half duplex?
802.11 anything is half duplex in practice. Only one station can speak at a time because of the CSMA/CA algorithm. It's the only way to ensure that there is no "collision" between 2 transmitting stations on a single channel. Mind you, that the CSMA/CA algorithm is applied per channel, not per SSID. So, if you have a neighbor on the same channel as you, both of your APs and all stations on the same channel are competing for "talk time" on the channel.
Which are the three forms of modulation?
There are actually 4 forms. The first and most common is AM, the next is SSB or Single Side band, the third is FM (Frequency Modulation) and the fourth is Digital
