Voice traffice is fairly constant. Data traffice is short bursts with long silences. Circuit switching is not efficient with data.
Circuit is an end-to-end connection between two subscribers. Capacity is reserved on all trunk lines and switches.
A cell is an area covered by a cellsite with antenna and equipment to serve mobile phones in the cell. The MTSO coordinates activity among the cellsites. It connects wired customers via a POP.
Converts digital computer signals to analog and sent over telephone lines. 3G is for sending data faster with a speed 2-3 Mbps. WiMAX is to replace DSL, Cable and cellular service with 1-4 Mbps. Satellite is very expensive because of long transmission distance. Two way data transmission is expensive. Some carriers are pushing fiber directly to the home with 100 Mbps or more.
4 True/False Questions
What is the thrust of Nyquist's formula? (Sampling rate should be twice the bandwidth) → Analog is electrical signals made from pressure waves.Digital is either on or off.
Describe the general structure of the PSTN - local loop, transport core, trunk line → Customer premises Equipment consists of telephones, wires, and other infrastructure on the customer premises. Most business have a PBX. It acts like switchboard. Local Loop- the access line to the customer. Transport-Carriage of voice during a conversation
What is DAC? ADC? → DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.
Where are analog and digital signals used in the PSTN? → Analog is electrical signals made from pressure waves.Digital is either on or off.