| Baseband data transmission | Passband data Transmission |
| 1. The digital data is transmitted over the channel directly, there is no carrier (or) any modulation. |
1. The digital data modulates high-frequency sinusoidal carrier. Hence it is also called as digital CW modulation .
∴carrier is required. |
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2. This is suitable for transmission over short distances. Examples:- Ethernet signals operating over a LAN (Local Area Network) The most common baseband modulation is (PAM) and PCM in local digital computer links. |
2. suitable for long distances transmission. Examples:- Microwave links, Satellite Communication links are called Passband communication systems. |
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3. Baseband transmission sends the information signal as it is without modulation. i.e, without frequency shifting. |
3. passband transmission shifts the signal(information) to be transmitted in low frequency to a higher frequency. i.e, Modulation is required. |
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4. baseband signals are in general low-frequency signals i. human voice(20Hz-5KHz). ii. video signal from a TV camera (0Hz-5.5MHz). Examples:- The telephone systems used for offices and homes (one room to other) transmits baseband signal as it is the system falls into baseband communication systems. |
4. whereas long-distance call that is transmitted via microwave (or) satellite links uses modulation which is known as passband communication systems. examples :- Passband Modulation techniques ASK,DPSK,FSK,QPSK,PSK,M-ary PSK etc. |
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