Networking Manual iii___________________________________________________________________________________NEC SL1100 Issue 6.0__________________________________________________________________________________Chapter 6 Network Design ConsiderationsSection 1 Introduction ............................................................................ 6-1Section 2 QoS.......................................................................................... 6-12.1 QoS Definitions .................................................................................... 6-12.2 Voice Quality Improvements ................................................................ 6-32.3 Types of Classifications for Traffic for QoS ......................................... 6-4Section 3 Internet Based Connections (xDSL, Cable, etc.)................. 6-6Section 4 Firewalls and NAT .................................................................. 6-74.1 Understanding the Infrastructure ......................................................... 6-74.2 Firewall Integration .............................................................................. 6-84.3 Virtual Private Network (VPN) Tunnelling ............................................ 6-9Section 5 CODEC and Bandwidth ....................................................... 6-115.1 CODECs ............................................................................................ 6-115.2 Bandwidth .......................................................................................... 6-13Section 6 Quality of Service (QoS) Implementation .......................... 6-136.1 Prioritization ....................................................................................... 6-146.2 Layer 2 QoS (802.1pq) ...................................................................... 6-166.3 Layer 3 QoS ....................................................................................... 6-206.4 IP Precedence ................................................................................... 6-226.5 Diffserv (Differentiated Service) ......................................................... 6-236.6 Comparison of IP Precedence and Diffserv Values ........................... 6-246.7 Programming QoS in the NEC SL1100 System ................................ 6-276.7.1 Marking Voice Traffic - Program 84-10-XX .................................... 6-276.7.2 NEC SL1100 Voice Protocols ........................................................ 6-27
