Upstream and downstream communication

1. Suppose N users compete using a statistical TDM system, and suppose the underlying physical transport can send K bits per second. What is the minimum and maximum data rate that an individual user can experience?

2. Of the four basic multiplexing techniques, is CDM always the best? Explain.

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3. Suppose an OC-12 circuit is twenty percent the cost of an OC-48 circuit. What multiplexing technology can an ISP use to lower the cost of sending data at the OC-48 rate. Explain.

1. How does code division multiplexing work?

2. Why do service providers distinguish between upstream and downstream communication?

3. What is an access technology?

4. Telephone companies once promoted ISDN as a high-speed access technology. Why has use of ISDN declined?

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