29) A 100 km long cable runs at the T1 data rate. The propagation speed in the cable is half the speed of light. How many bits is in the cable

30) How much bandwidth is there in 0.1 micron of spectrum at a wavelength of 1 micron ?

31) It is desired to send a sequence of computer screen images over an optical fiber. The screen is 480 x 640 pixels, each pixel being 24 bits. There are 60 screen images per second. How much bandwidth is needed, and how many microns of wavelenth are needed for this band at 1.30 microns

32) Establishing a virtual connection is virtually equivalent to

33) How many digits of the network user Address are known as the DNIC (Data Network Identification Code) ?