Avaya BCM 4.0 Networking Guía de configuración descargar pdf (Pagina 504)

100

101

504 Chapter 60 Configuring the WAN resources

N0060606N0060606

Point-to-Point Protocol (PPP)

Point-to-Point Protocol (PPP) is a full-duplex transmission protocol for communication between

two computers using a serial interface. A typical PPP connection is a personal computer connected

by telephone line to a server. For example, your Internet service provider (ISP) provides you with

a PPP connection so that the ISP server can respond to your requests, pass them on to the Internet,

and return your requested Internet responses to you.

• Multi-link Point-to-Point Protocol (MLPPP)

MLPPP is used to connect multiple B-channels together when using PRI or BRI ISDN as the

WAN interface. This allows BCM to connect B-channels independently of each other so that the

ISDN connection can be used for both voice and data.

WAN data compression

BCM provides a WAN Data Compression feature. You can use data compression on a permanent

WAN connection and on a backup WAN connection. You can enable or disable WAN Data

Compression from the “Setting WAN Frame Relay Parameters” on page 511 panel or from the

“WAN PPP Parameters” on page 516 panel, depending on your system configuration.

On a permanent WAN connection, BCM supports the following data compression protocols:

• Frame Relay Forum standard FRF.9 data compression protocol with STAC compression

algorithm

• PPP Stac LZS Compression Protocol (RFC 1974) with STAC compression algorithm.

On dial-up WAN connections, BCM supports the following data compression protocol:

• Microsoft Point-to-Point Compression (MPPC), RFC 2118

• Header compression - This feature provides the option to compress the 40 byte IP/UDP/RTP

header into 2 or 4 bytes on a link-by-link basis. By applying this compression over a slower

link, it increases the bandwidth utilization significantly. As a result, more concurrent VoIP

trunks can be put into the same link at the same time, and the voice quality is improved

because of the reduced transmission delay. The IP/UDP/RTP Header Compression is

implemented based on RFC 2508. Protocol negotiation of IP/UDP/RTP header compression is

based on RFC 2509 in PPP and FRF .20 in Frame Relay.

• packet fragmentation - Fragmentation is a required feature for all Nortel network products if

the products are operated over network links with bandwidth of 1M bps or lower. The major

advantage of doing link-layer fragmentation (such as Multilink PPP) over the IP layer

fragmentation over a slow link is: while it reduces the jitter effect for voice packets, it also

reduces the end-to-end delay for data packets as introduced by the IP layer fragmentation. The

Multilink PPP implementation follows RFC 1990.

Note: Fragmentation and header compression cannot be enabled at the same

time.

1 2 ... 499 500 501 502 503 504 505 506 507 508 509 ... 757 758

Comentarios a estos manuales

Sin comentarios

Avaya BCM 4.0 Networking Guía de configuración Pagina 504

Comentarios a estos manuales

Relacionado con productos y manuales para Redes Avaya BCM 4.0 Networking