Allied Telesis AR Router Series, Справочник по аппаратуре

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Hardware Reference 59
C613-03031-01 REV E
Compression
MAC-based compression has the following features:
■
Local 32-bit processor for high speed control and data transfer.
■
Dedicated high performance 32-bit compression hardware.
■
High compression ratio Lempel-Ziv algorithm in hardware.
■
2 MBytes of history memory.
■
Support for up to 127 compression channels.
Compression and decompression operations are performed by a 32-bit data
compression coprocessor specifically designed for high-performance Lempel-
Ziv compression applications. The 2 MBytes of history memory allows up to
127 individual data links to use compression concurrently, enabling MACs to
provide compression for complicated network architectures. Figure 27 on page
59 shows typical compression ratios achieved by a MAC for a representative
set of file types.
Figure 27: Typical hardware compression ratios by file type.
Encryption
MAC-based encryption has the following features:
■ Local 32-bit processor for high speed control and data transfer.
■ Dedicated high performance 32-bit Data Encryption Standard (DES)
hardware.
■ Optional key access control.
■ Support for up to 127 encryption channels.
MAC DES encryption is based on a fast 32-bit device that complies with FIPS
PUB 46, ISO DEA-1 and ANSI X3.92 standards.
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File Type
Compression Ratio
CMPRATIO