PERFORMANCE IN THE PHYSICAL LAYER
The performance of data communication in a network refers to how effectively and efficiently the
physical medium facilitates the transmission of data between devices.
Some key factors
and metrics associated with the performance of the Physical Layer:
1. Data Rate (Bit
Rate): the
rate at which bits are transmitted over the communication channel.
It is measured in
bits per second (bps).
2. Bandwidth: the range of frequencies available for data transmission in the communication channel. It is a key factor influencing data rate.
3. Noise and signal-to-noise ratio (SNR): measures the ratio of the signal power to the noise power. A higher SNR is desirable for better performance.
4. Attenuation: the reduction in signal strength, travels through the transmission medium.
5. Propagation Delay: the time takes for a signal to travel from the sender to the receiver.
6. Jitter: the variation in the timing of signal pulses. Low jitter is important.
7. Bit Error Rate (BER): the measure of the percentage of bits that are received incorrectly due to noise, interference, or other impairments.
8. Duplexing: Duplexing refers to the ability of a communication channel to support simultaneous two-way communication.
9. Modulation Techniques: A technique that influences how efficiently data is encoded onto the physical medium.
10. Reliability: Reliable physical connections, proper cable installations, and robust hardware contribute to overall network reliability.
11. Physical Layer Protocols: define the rules for data transmission, encoding, and decoding.
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