Transmission Techniques |
Baseband transmission – |
To transmit encoded signals over cable, we mainly use two techniques such as Baseband transmission and broadband transmission. |
Baseband systems use digital signaling over a single frequency. Signals flow in the form of discrete pulses of electricity or light. |
As the signal propagates along the cable, it gradually decreases in strength and can become distorted. |
To overcome this problem Baseband system sometime s use repeaters. |
Repeaters receive an incoming signal and retransmit it at its original strength and definition. Thereby increasing the practical length of a cable. |
Broadband Transmission – |
Broadband systems use analog signaling and a range of frequencies. |
With analog transmission the signals employed are continuous and non discrete. |
Signals travel across the physical medium in the form of electromagnetic or optical waves. |
To regenerate analog signals broadband systems use amplifiers. |
Because the signal flows in broadband transmission is unidirectional, there must be two paths for data flow. |
The two common ways to accomplish this are |
i) Mid-split broadband configuration divided the bandwidth into two channels; one is used for transmitting signals, the other is for receiving. |
ii) In dual cable broadband configuration, each device is attached to two cables. One is used to send and the other to receive. |
Thursday, February 5, 2009
Transmission Techniques
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