1. pulse amplitude modulation

2. Digital subscriber line - Transmission methods
TC-PAM: Trellis Coded Pulse Amplitude Modulation, used for HDSL2 and SHDSL

3. Gigabit Ethernet - 1000BASE-T
In a departure from both 10BASE-T and 100BASE-TX, 1000BASE-T uses all four cable pairs for simultaneous transmission in both directions through the use of adaptive equalization and a 5-level pulse amplitude modulation (PAM-5) technique

4. 10/100 - Cabling
The standard on copper twisted pair is IEEE 802.3ab for Cat 5e UTP cable|UTP, or 4D-PAM5; four dimensions using PAM (pulse amplitude modulation) with five voltages, −2V, −1V, 0V, +1V, and +2V While +2V to −2V voltage may appear at the pins of the line driver, the voltage on the cable is nominally +1V, +0.5V, 0V, −0.5V and −1V.

5. DSL - Transmission methods
* TC-PAM: Trellis Coded Pulse Amplitude Modulation, used for HDSL2 and SHDSL

6. Pulse amplitude modulation - Generation of PAM
These are all come under pulse amplitude modulation..

7. Pulse amplitude modulation - Types
There are two types of pulse amplitude modulation:

8. RZI
The zero between each bit is a neutral or rest condition, such as a zero amplitude in pulse amplitude modulation (PAM), zero Phase (waves)|phase shift in phase-shift keying (PSK), or mid-frequency in frequency-shift keying (FSK).

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