Westermo MR Series - Manual (Page 177)

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Web Interface and Command Line Reference Guide www.westermo.com
Confi gure > PPP 4.56
Point-to-Point Protocol (PPP) is a standard tunnelling protocol for transporting data from point to
multipoint networks (such as IP) across point-to-point links (such as a serial or ISDN connection).
This is essential for dial-up Internet access.
As data is transferred across IP networks in synchronous format, your unit supports asynchro-
nous to synchronous PPP conversion. This allows asynchronous terminals connected to the unit
to communi cate with remote synchronous PPP devices. Normally this is carried out using a single
ISDN B-channel so that data can be transferred at speeds up to 64kbps. This is known as ASYNC
to SYNC PPP oper ation and is supported as standard by most terminal adaptors. To use ASYNC to
SYNC PPP operation all that is necessary is to ensure that the PPP protocol is bound to the ASY
port to which the terminal or PC is connected (see Configure > Protocol Bindings).
Note:
In order to use ASYNC to SYNC PPP your terminal must also support the PPP protocol
(Windows dial-up networking supports PPP).
In addition to ASYNC to SYNC operation (where the router only converts the PPP from one form
to another) the router can initiate its own PPP sessions. This is used for example when:
The router is configured as a router to connect an Ethernet network to the Internet via ISDN or
GPRS
The router is answering an incoming ISDN call with PPP either for remote management or remote
access to the Ethernet network to which the router is connected
You access the router locally through the serial port for configuration purposes be setting up a
Windows Dial-Up-Networking connection to the “phone number” 123
Note:
With the exception of MLPPP the parameters in this section are only relevant when the router
is gen erating the PPP, i.e. they are NOT relevant for Async to Sync PPP operation.
The unit also supports Multi-Link PPP (MLPPP). MLPPP uses both ISDN B-channels simultaneously
(and two PPP instances), to provide data transfer speeds up to 128Kbps for applications such as
email transmission and retrieval, high speed internet access (your ISP must also support MLPPP) or
estab lishing a high speed point to point connection between two units.
Confi guring PPP
The Configure > PPP folder contains a number of sub-folders and sub-pages for configuring vari-
ous aspects of PPP operation. These pages are described in the following sections.