COMP 3203 Lecture Notes - Lecture 3: Analog Signal, Mega Man Network Transmission, Bipolar Encoding
26 Oct 2018
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Across a single hop in the network: 2. End-to-end across an entire network: the network transmission process. It is then converted into an analog signal. Analog signal can be different at different points in the transmission system. Then gets converted back to digital and received by receiver. Need modulator to control signal: encoding and modulation, digital-to-digital conversion: computer data are stored as 0s and 1s. Most high-speed communication now uses encoding schemes with better coding performance: manchester transmits the xor of nrz with the clock. Important consideration is synchronization of the receiver to the transmitter. It might appear that a half bit period error would give an inverted output at the receiver, but for typical data this leads to code violations. The result is then transmitted with nrz-i: do(cid:374)"t (cid:374)eed to (cid:396)e(cid:373)e(cid:373)(cid:271)e(cid:396) this. Would give on test: example: arrange bits in groups of four and use the table. Fix a value of k (usually k = 6): 2.
