problem 1: What implementations of EIA-232 are available? How are they dissimilar?

problem 2: What is the main purpose of null modem? describe the data pins of the null modem.

problem 3: Compare the RS-423 with RS-422.

problem 4: How is X.21 able to eradicate most of the control circuits of the EIA standards?

problem 5: What does the word modem stands for? What is the function of a demodulator and determine the function of modulator?

problem 6: What factors influence the data rate of a link?

problem 7: Illustrate the bandwidth of a line. State the bandwidth of a traditional telephone line?

problem 8: What do you mean by intelligent modem?

problem 9: Describe the asymmetry of 56K modems.

problem 10: Describe that how a cable modem achieves such a high data rate.