name: PPP
full_form: Precise Point Positioning
context: PPP Multiplexing (PPPmux) [10], figure 6-6, provides a method to reduce the PPP framing [11] [12] overhead used to transport small packets, e.g. voice frames, over slow links. PPPmux sends multiple PPP encapsulated packets in a single PPP frame. As a result, the PPP overhead per packet is reduced. When combined with a link layer protocol, such as HDLC, this offers an efficient transport for point-to-point links. At a minimum, PPP encapsulating a packet adds several bytes of overhead, including an HDLC flag character (at least one to separate adjacent packets), the Address (0xFF) and Control (0x03) field bytes, a two byte PPP Protocol ID, and the two byte CRC field. Even if the Address and Control Fields are negotiated off and the PPP Protocol ID is compressed, each PPP encapsulated frame will include four bytes of overhead. This overhead can be reduced to one or two bytes. The key idea is to concatenate multiple PPP encapsulated frames into a single PPP multiplexed frame by inserting a
description: Precise Point Positioning (PPP) is a protocol used for efficient data transmission over point-to-point links. It reduces the overhead of PPP framing by multiplexing multiple PPP encapsulated packets into a single PPP frame.
explanation: The text describes PPP as a set of rules governing data transmission, specifically mentioning its role in reducing overhead and improving efficiency in point-to-point communication. This aligns with the definition of a protocol.
section_title: 6.2.3.1	PPP Multiplexed Frame Option Over HDLC
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