Chapter 4 Configuration FCD-IPM Installation and Operation Manual
4-8 Quick Setup Menu
Table 4-2. WAN Parameters Parameters Possible Values Description
Protocol PPP
RFC-1490
Point to Point Protocol. PPP consists of 3 components:
Encapsulation method – for IP datagrams on a serial link PPP supports HDLC
synchronous links.
LCP – Link control procedure to establish, configure, and test the data-link
connection. Having an LCP allows each end to negotiate various options.
NCP(s) – A family of network control protocols specific to different network layer
protocols. The NCPs allow each end to configure network control parameters.
PPP is often used across slow serial lines. It is therefore important to reduce the
number of bytes per frame in order to reduce the latency time. Using LCP, most
implementations negotiate to omitting the constant address and control fields and
reducing the size of the protocol fields from 2 bytes to 1 byte. In addition, when
using IP NCP, most implementations use Van Jacobson header compression to
reduce the size of IP and TCP headers.
Encapsulation method for carrying network interconnect traffic over a Frame
Relay backbone. RFC-1490 also supports a simple fragmentation procedure for
carrying large frames over a frame relay network with a smaller MTU.
DLCI – Every network interface card (NIC) has a Data Link Communication
Identifier (DLCI) that uniquely identifies the node on the network. DLCI enables
connection to the Frame Relay network without configuring Frame Relay
parameters.
DLCI executes congestion control when an explicit congestion notification is
received for the DLCI from the Frame Relay network. The unit reduces the
transmitted information rate of the DLCI and increases it when the congestion
condition is cleared.
Default : PPP
DLCI Number Sets the DLCI identification number.