Q & A
Q1: Define bandwidth
Answer: Bandwidth refers to the maximum capacity of a transmission media or channel that can be allocated.
Q2: What are the types of transmission based on bandwidth usage?
Answer: Two types i.e.
i. Baseband Transmission
ii. Broadband Transmission
Q3: What is baseband? What are its important features?
Answer: Baseband transmission is a transmission of signals without modulation. It uses the entire bandwidth for a single channel. Baseband is commonly used for digital signaling, but it can also used for analog signal. Signals flow in the form of discrete pulses of electricity or light i.e. 1s and 0s. The entire spectrum of the cable is consumed by the signal. This scheme does not allow frequency-division multiplexing.
Important features of baseband transmission are:
· Baseband transmission use digital signal over a single frequency.
· Signals flows in the form of discrete pulses of electrical or light.
· The digital signal uses the complete bandwidth of a single channel.
· Baseband systems use repeater.
· No modem is required.
· Used for a short distance.
· Commonly use in Local Area Networks.
Q4: What are the advantages of using baseband cables?
i. Low maintenance cost.
ii. Simple to install and tap.
iii. Better resistance to signal noise over longer distance.
Q5: What are the disadvantages of using baseband cables?
i. Limited distance and topology.
ii. Low security, easily tapped.
iii. Difficult to make major changes to the cabling topology.
iv. Cable cost is higher than that of twisted pair.