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ZyXEL Communications omni.net LCD+M User Manual

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Technical Reference for ZyXEL omni.net series 
 
7-1
Chapter 7  
Point-to-Point Protocol (PPP) 
Introduction to PPP 
 
Point-To-Point Protocol (PPP) is designed for simple links, which transport packets between two 
peers. These links provide full-duplex simultaneous bi-directional operation, and are assumed to 
deliver packets in order. PPP is intended to provide a common solution for easy connection for a 
wide variety of hosts, bridges and routers. 
In the process of configuring, maintaining and terminating the point-to-point link, PPP goes 
through several distinct phases, as specified in the following simplified state diagram: 
Figure 7. Point-to-Point Link Pathway
Up 
Opened 
S
u
cce
ss/
N
o
n
e
 
Fail 
Closing
Down 
Fail 
Idle 
Establish 
Network 
Terminate 
Authentication 
Point-to-Point Link Pathway