
U.S. Robotics SureConnect ADSL Ethernet/USB Router User Guide
PAM (Pulse Amplitude Modulation) Modulation method used by modems and DSL equipment. The signal modulates or alters the amplitude or intensity of the carrier. In regular AM, the carrier is a sinewave. In PAM, the carrier is a periodic series of DC pulses.
PCM (Pulse Code Modulation) - Digital modulation method for transmitting analog data. PCM signals are binary. These signals can represent any analog data with only two states, logic 0 and logic 1.
PDM (Pulse Duration Modulation) Modulation method. Signal modulates or alters the duty cycle of the pulse. In PDM, the carrier is a pulse stream. Also called PWM (Pulse Width Modulation).
Peak Cell Rate - Maximum rate (Cells/second) for sending cells to the network.
Phase - Position of a periodic waveform.
PM (Phase Modulation) Modulation method used by modems, radio, and DSL equipment. The signal modulates or alters the phase or position of carrier waves. In regular PM, the carrier is a sinewave. The phase of the modulated carrier changes in proportion to signal amplitude.
Port Priority - Parameter that determines which port becomes the root bridge port.
POTS (Plain Old Telephone Service) - Basic voice service available in residences throughout the United States.
PP
PPM (Pulse Position Modulation) Modulation method used by modems and DSL equipment. The signal modulates or alters the location of a pulse in the carrier. The carrier is a stream of pulses.
PPPoA
∙offers service providers similar billing and access control with a presence in
∙provides session authentication using Password Authentication Protocol (PAP).
∙provides session authentication using Challenge Handshake Authentication Protocol (CHAP).
∙achieves session accounting and conservation of bandwidth by closing down unused sessions.
∙allows the IAD/Router and ISP link to easily negotiate network parameters.
file:///P/T_WRITER/Documentation/Released/900...003%20(Guiness)%20prac%20template/glossary.htm (7 of 11) [11/6/2002 9:02:38 AM]