Panasonic UF-E1 Service Manual page 166

UF-E1
5. PPP Link Processing (RFC 1661)
Figure 6.5.2.6 shows the outline of the transition of PPP states and Table 6.5.2.4 shows the details of
transition. After the system is booted, link is established by LCP. When this is done, the negotiation
(adjustment) for link setting option is conducted at the same time. This is not done on everything but
only for those that do not depend on network protocol. The options that are related to network protocol
are conducted by each NCP. After the link establishment phase comes authentication phase. If authen-
tication fails, then the phase will transfer to link termination phase.
The authentication phase can be omitted. After this phase, each NCP conducts setting for network pro-
tocols to be used. This makes it possible for IP and other network protocols to function. Below are
descriptions for different phases in Figure 6.5.2.6.
Key Point
1
Physical-electrical stop
1
5 phases
2
Only LCP can be sued
3
LCP authorization protocol'
Quality monitoring packet usable
4
CP/NCP/Network Layer
protocols usable
Link closed/ CD-OFF/ Authorization failed/
Link quality failed/ Idle time out
5
Non-LCD packet ignore
Figure 6.5.2.6 Transition chart of PPP (outline)
2
IP becomes open in the network layer protocol phase
Link Dead phase
Physical-electrical boot (CD-ON, etc.)
Link Establishment phase
Link setting request packet
Option/default change
authorization use request
Send/Receive setting
authorization packet
Link Open Sate
Authorization phase
Authorization
Authorization
failed
Network layer Protocol phase
NCP Open/Close
NCP open state
Link Termination phase
End request packet
Notice to network layer
(End request transmission side) End acknowledge receive
(End request receive side) End acknowledge transmission
The signal of physical layer cutting
162
Link setting
request packet
or elapse of restart timer