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Using Enterprise Edge Services 39

P0910464 Issue 01 Enterprise Edge Networking Operations Guide

PPP is a full-duplex protocol that can be used on various physical media, including

twisted pair or fiber optic lines or satellite transmission. It uses a variation of High

Speed Data Link Control (HDLC) for packet encapsulation.

PPP can process synchronous as well as asynchronous communication. PPP can

share a line with other users and it has error detection.

PPP on the primary WAN link uses synchronous point-to-point communication.

Because the physical media is point-to-point, authentication attributes are not

supported in this mode.

Enterprise Edge supports PPP Compression Control Protocol (CCP) (RFC 1962)

with STAC compression algorithm.

This compression is done by software and can be enabled or disabled by using a

parameter in PPP configurations.

Backup Up WAN Connection

In Enterprise Edge, the back up WAN connection is a V.90 modem that is used as

a dial-up WAN link.

The modem is provided through an RJ-11 connector. The modem has the following

features:

• V.90 56 kbps ITU standard

• V.34 33.6 kbps ITU standard

• V.42/MNP 2-4 error control

• V.42 bis/MNP 5 data compression

• Compatible with ITU and Bell Standards from 56 kbps down to 1200 bps

Note: The modem is capable of receiving at up to 56 kbps and sending at up to

31.2 kbps. Because of FCC regulations, receiving speeds are limited to 53

kbps. The actual speed can vary, depending on factors such as current line

noise.

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Avaya EE Networking Guida Utente Pagina 39