TC-PAM
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Trellis-coded pulse-amplitude modulation (TC-PAM) is the
HDSL and SDSL standards, TC-PAM improves range at a given bit-rate and provides enhanced spectral compatibility with ADSL
.
TC-PAM is also known as 4B1H, because it uses 16 levels to represents a 4 digit binary, 4 Binary 1 Hexadecimal.
References
- ^ Johannes Huber. "Multilevel-Codes: Distance Profiles and Channel Capacity".