RAD Data comm E1/T1, Modular Access Device with Integrated Router Ppp, RFC-1490, Default PPP

Chapter 4 ConfigurationFCD-IPMInstallation and Operation Manual

		Table 4-2. WAN Parameters
Parameters	Possible Values	Description
Protocol	PPP	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.
	RFC-1490	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.

4-8 Quick Setup Menu