Avaya Configuring Data Compression Services Manuel d'utilisateur télécharger pdf (Page 29)

Data Compression Overview

114061 Rev. A 2-3

Data Compression Performance

The goals in using data compression are to achieve a high compression ratio while

maximizing throughput. Compression ratio is the size of uncompressed data

compared to the size of the same data after it has been compressed. Throughput

refers to the speed of transmitting data.

The compression ratio varies according to the effectiveness of the compression

algorithm, but also according to the characteristics of the data you are

transmitting: data that includes a lot of redundant strings compresses at a high

ratio.

Throughput, or network response time, varies with the number of elements in the

network that the data must traverse, including the compression/decompression

process.

Software Compression

Bay Networks software-based data compression is most effective for sites that

have WAN connections at relatively low speeds such as 56/64 KB, where you

want to achieve data compression at low cost, and with minimal memory

requirements. It supports up to 512 Kb/s on the FRE-040. For networks operating

at faster speeds, you should use hardware compression.

Hardware Compression

Bay Networks hardware-based compression works with Frame Relay and PPP

networks. It best serves sites that support T-1/E-1 lines, which often concentrate

many lower-speed remote connections. Our hardware compression facility

operates at high speeds, and also supports high-density WAN connections. Use

hardware compression when you want to achieve high compression ratios and

throughput, and also want to preserve router memory to perform other functions.

We offer two compression daughterboards for the BN and two compression net

modules for the ASN.

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 53 54

Pas de commentaire

Avaya Configuring Data Compression Services Manuel d'utilisateur Page 29