Operation Manual

Operating modes and functions

ELSA LANCOM Wireless

English

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Dialup-remote

Subscriber number transmitted by the remote station (incl. country and long

distance codes if available).

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Remote site

Name of the remote station as specified in the name list. The remote station will

be called back if so specified in the name list.

Point-to-point protocol

ELSA routers also support the Point-to-Point Protocol (PPP). PPP is a generic term for a

whole series of WAN protocols which enable the interaction of routers made by different

manufacturers since this protocol is supported by practically all manufacturers.

Due to the increasing importance of this protocol family and the fact that PPP is not

associated with any specific operating mode of the routers, we will be introducing the

functions of the devices associated with the PPP here in a separate section.

The protocol

What is PPP?

The point-to-point protocol was developed specifically for network connections via serial

channels and has asserted itself as the standard for connections between routers. It

implements the following functions:

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Password protection according to PAP or CHAP

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Negotiation of the network protocol to be used over the connection established (IP

or IPX, for example). Included in this are any parameters necessary for these

protocols, for example IP/IPX addresses. This negotiation runs via the IPCP protocol

(IP Control Protocol).

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Verification of the connection through the LCP (Link Control Protocol)

PPP is the standard used by router connections for communication between devices or

the WAN connection software of different manufacturers. Connection parameters are

negotiated and a common denominator is agreed using standardized control protocols

(e.g. LCP, IPCP, CCP) which are contained in PPP, in order to ensure successful data

transfer where possible.

What is PPP used for?

It is best to use the point-to-point protocol in the following applications:

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for reasons of compatibility, e.g. when communicating with external routers

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Internet access (when sending addresses)