TC-PAM

Trellis-coded pulse-amplitude modulation (TC-PAM) is the modulation format that is used in HDSL2 and G.SHDSL. It is a variant of trellis coded modulation (TCM) which uses a one-dimensional pulse-amplitude modulation (PAM) symbol space, as opposed to a two-dimensional quadrature amplitude modulation (QAM) symbol space.^[1] Compared to the 2B1Q scheme used in the older 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

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Line coding (digital baseband transmission)

Main articles

• Unipolar encoding
• Bipolar encoding
• On-off keying
• Mark and space

Basic line codes

• Return to zero (RZ)
• Non-return-to-zero, level (NRZ/NRZ-L)
• Non-return-to-zero, inverted (NRZ-I)
• Non-return-to-zero, space (NRZ-S)
• Manchester
• Differential Manchester/biphase (Bi-φ)

Extended line codes

• Conditioned diphase
• 4B3T
• 4B5B
• 2B1Q
• Alternate mark inversion
• Modified AMI code
• Coded mark inversion
• MLT-3 encoding
• Hybrid ternary code
• 6b/8b encoding
• 8b/10b encoding
• 64b/66b encoding
• Eight-to-fourteen modulation
• Delay/Miller encoding
• TC-PAM

Optical line codes

• Carrier-suppressed return-to-zero
• Alternate-phase return-to-zero

• See also: Baseband
• Baud
• Bit rate
• Digital signal
• Digital transmission
• Ethernet physical layer
• Pulse modulation methods
• Pulse-amplitude modulation (PAM)
• Pulse-code modulation (PCM)
• Serial communication
• Category:Line codes

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