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Configuring Data Compression Services
2-2
308616-14.00 Rev 00
Nortel Networks Compression Services
Nortel Networks compression services include:
• Software-based compression for PPP, frame relay, and X.25 networks for all
router platforms and all serial interfaces.
PPP compression works on multiline, multilink, on the ISDN BRI and PRI
modules, and on lines that use Raise DTR or V.25bis modem interfaces with
dial services. Frame relay compression works on multiline and dial backup
lines.
• Hardware-based compression for PPP and frame relay networks for BN
routers using one of the following modules:
-- Octal synchronous link module using FRE-2 processors
-- FRE-2-060E processor module with the advanced compression
coprocessor daughterboard to which you can connect a broad range of
Nortel Networks link modules (see “Hardware-Based Data Compression
for the BN Platform” on page 1-3 for the list of supported link modules).
Hardware compression on the BN supports all PPP and frame relay services
that WCP software compression supports.
• Hardware-based compression for PPP and frame relay networks for the ASN
router.
A compression net module compresses data transmitted over a WAN network
by dual and quad synchronous, MCE1/ISDN PRI, MCT1/ISDN, dual
synchronous with ISDN BRI, and quad BRI net modules. Hardware
compression on the ASN supports all PPP services that WCP software
compression supports.
Nortel Networks WCP software- and hardware-based compression interoperate
fully because they use the same algorithm.
Hi/fn LZS hardware compression is supported by the FRE-2-060E processor with
the advanced compression coprocessor daughterboard for the BN when
connecting to a router from another vendor that is also running the Hi/fn LZS
algorithm.
To use software data compression effectively, you must decide how to allocate
memory for this task. The goal is to compress data as much as possible and to
transmit the data as quickly as possible without taxing the resources of the router.
- 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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