Why Multiplex?
Economies of Scale
- 64 kbps lines carry a single 64 kbps signal
- T1 lines can multiplex 24 such signals
- Yet T1 lines cost only about 3-5 times as much as 64 kbps lines
Example: Suppose you have ten 64 kbps signals
- This will require ten 64 kbps lines
- But one T1 line will carry them for only 3-5 times the cost of a single 64 kbps line