5 Written questions
4 Multiple choice questions
- ADSL uses 1 VG UTP lines. Cable uses optical fiber to the neighborhood with thick coaxal cables. Thin coaxial drop cables go to the residences.
- GSM is dominant in Europe and Asia. CDMA is dominant in the US. CDMA can use the same channel in adjacent cells, providing more channel reuse and so more customers.
- Voice Over IP. The gateway translates between the signaling technology and transport technology.A codec is required. UDP and SIP
- DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.
4 True/False questions
What is pulse code modulation? When is it used? → Pulse code modulation is the signal being sampled 8,000 times per second. Each sample is 1/8000 of a second. Each sample period, the amplitude of the signal is sampled. Each filter can distinguish 256 loudness levels.Produces 8 bits per sample.
Define circuit switching and compare with packet switching → Circuit is an end-to-end connection between two subscribers. Capacity is reserved on all trunk lines and switches.
Compare voice and data traffic; How are circuit switching and packet switching used with voice and data traffic? Why? → Circuit is an end-to-end connection between two subscribers. Capacity is reserved on all trunk lines and switches.
What media are used for the local loop? → 1-pair Voice Grade UTP, 2-pair data-grade UTP, and optical fiber