Cabletron Systems CSX400 - Manual (Page 76)

CSX WAN Configuration
4-12 Configuring the PPP Protocol
4. To change the Line Coding, click on the selection box; a pull-down menu will
appear. Select None, J8ZS, or Inverted HDLC, as appropriate. Remember
that None (the default value) should not be selected when you are using AMI
line coding on the interface
5. Click on to save the changes or to restore the original
configuration.
The saved conÞguration changes will appear in the WAN interface list.
Configuring the PPP Protocol
After you have assigned protocols to your interfaces, you should conÞgure the
protocols appropriately.
You use the PPP Link Control ConÞguration window to set up the Point-to-Point
Protocol for use on your network interfaces on your WAN connection. This
window also lets you access the Bridge Network Control Protocol ConÞguration
window. As deÞned by RFC 1661, the Point-to-Point Protocol (PPP) is a standard
method of transporting multi-protocol datagrams over point-to-point links. A
PPP Link provides full-duplex communication between the endpoints, allowing a
simultaneous bi-directional operation that should maintain the order in which
data packets are transmitted.
There are three components to PPP:
¥ A method of encapsulating the datagrams to be transported. This
encapsulation allows different network-layer protocols to be simultaneously
multiplexed over the same link, and is compatible with commonly used
network hardware.
¥ The Link Control Protocol (LCP), which is used to establish, conÞgure, and test
the point-to-point data-link connection. The Link Control Protocol provides a
mechanism for conÞguring and managing the link between the end point
connections. LCP allows both endpoints to describe their capabilities and
requirements to each other, and negotiate the encapsulation format and the
maximum datagram size. LCP also detects common conÞguration errors, such
as loopback conditions, and terminates the link when the communication is
complete. Other management options provided by LCP include the
authenticating of the peers on each end of the link, and determining whether
the link is functioning properly or failing.
¥ A family of Network Control Protocols (NCP), used to establish and conÞgure
the different network-layer protocol datagrams that need to be transported.
To access the PPP Link Control Protocol ConÞguration window:
1. Click on . A pull-down menu will appear.
2. Drag down to PPP and release. The PPP Link Control Protocol Configuration
window will appear.