RAD Data comm Modular Access Device with Integrated Router Manuel D’Utilisation

Chapter 4  Configuration 

FCD-IPM Installation and Operation Manual 

4-8 

Quick Setup Menu

 

 

Protocol 

 
 
 
 
 

Point to Point Protocol. PPP consists of 3 components:  

  – for IP datagrams on a serial link PPP supports HDLC 

synchronous links. 

 – 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. 

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. 

 

DLCI Number   

Sets the DLCI identification number.