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Configuring Data Compression Services
2-4
308616-14.00 Rev 00
Hi/fn LZS Algorithm
Hi/fn is a wholly owned subsidiary of Stac, Inc. Nortel Networks Hi/fn LZS
compression software incorporates LZS from Hi/fn.
Nortel Networks Hi/fn LZS compression software is based on the Hi/fn LZS
algorithm to transport compressed packets across a PPP link. Hi/fn LZS
implements an error detection mechanism, which means that it can detect whether
packets are lost during transmission. Hi/fn LZS does not retransmit packets if they
are lost.
The Hi/fn LZS compression algorithm searches incoming data for redundant data
strings and replaces these strings in the outgoing data with encoded tokens of
shorter length. Hi/fn LZS creates the encoded tokens from information in a table
that the Hi/fn LZS algorithm builds. This table consists of string matches, which
point to previous incoming data. As the table is built and tokens are created,
subsequent data is compressed based on previous data.
Compression Control Protocol (CCP)
Nortel Networks uses RFC 1962, the Compression Control Protocol (CCP), to
enable or disable compression across a PPP link and determine what kind of
compression is used. CCP also includes a history reset request and
acknowledgment capability, which Hi/fn LZS uses but WCP does not. WCP uses
its own negotiation mechanism.
Nortel Networks WAN Compression Protocol (WCP)
Nortel Networks proprietary WAN Compression Protocol (WCP) is an IETF draft
standard. WCP enables compression for frame relay and for X.25, and transports
compressed packets for PPP, frame relay, and X.25. WCP negotiates compression
mode, history size, and buffer size. For PPP and frame relay, WCP also
retransmits packets in the event of packet loss and protects against inadvertent
data expansion (LAPB retransmits packets for X.25).
WCP is most effective for sites that have WAN connections operating at relatively
low speeds such as 56/64 KB, where you want to achieve data compression at low
cost and with minimal memory requirements. WCP supports connections up to
512 KB/s on the FRE-040. For networks operating at faster speeds, you should
use hardware compression.
- Configuring Data 1
- Compression Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308616-14.00 Rev 00 11
- Before You Begin 13
- Text Conventions 14
- Acronyms 15
- Hard-Copy Technical Manuals 16
- How to Get Help 17
- Starting Compression 19
- Chapter 1 19
- Site Manager 22
- Using the BCC 23
- Using Site Manager 28
- Enabling Compression for X.25 30
- (continued) 32
- (continued) 32
- For More Information 34
- Chapter 2 35
- Data Compression Overview 35
- Data Compression Architecture 37
- Hi/fn LZS Algorithm 38
- Data Compression Performance 39
- Hardware Compression 39
- How Data Compression Works 42
- CCP Negotiations 44
- WCP Negotiations 44
- Data Transmission 45
- PPP Services 45
- Frame Relay Services 47
- X.25 Services 49
- Chapter 3 51
- Customizing Data Compression 51
- Maximizing Throughput 54
- Disabling and Reenabling WCP 66
- Appendix A 69
- Site Manager Parameters 69
- WCP Line Interface Parameters 70
- Appendix B 85
- Using the BCC show Command 85
- Online Help for show Commands 86
- Appendix C 97
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