NEC SL1100 - Page 7

Networking Manual iii
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NEC SL1100 Issue 6.0
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Chapter 6 Network Design Considerations
Section 1 Introduction ............................................................................6-1
Section 2 QoS.......................................................................................... 6-1
2.1 QoS Definitions .................................................................................... 6-1
2.2 Voice Quality Improvements ................................................................ 6-3
2.3 Types of Classifications for Traffic for QoS ......................................... 6-4
Section 3 Internet Based Connections (xDSL, Cable, etc.)................. 6-6
Section 4 Firewalls and NAT .................................................................. 6-7
4.1 Understanding the Infrastructure ......................................................... 6-7
4.2 Firewall Integration .............................................................................. 6-8
4.3 Virtual Private Network (VPN) Tunnelling ............................................ 6-9
Section 5 CODEC and Bandwidth .......................................................6-11
5.1 CODECs ............................................................................................ 6-11
5.2 Bandwidth ..........................................................................................6-13
Section 6 Quality of Service (QoS) Implementation ..........................6-13
6.1 Prioritization ....................................................................................... 6-14
6.2 Layer 2 QoS (802.1pq) ...................................................................... 6-16
6.3 Layer 3 QoS .......................................................................................6-20
6.4 IP Precedence ................................................................................... 6-22
6.5 Diffserv (Differentiated Service) ......................................................... 6-23
6.6 Comparison of IP Precedence and Diffserv Values ........................... 6-24
6.7 Programming QoS in the NEC SL1100 System ................................ 6-27
6.7.1 Marking Voice Traffic - Program 84-10-XX ....................................6-27
6.7.2 NEC SL1100 Voice Protocols ........................................................6-27