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Deploying SpectraLink 8020/8030
Wireless Telephones
May 2009 Best Practices Guide
Table of Contents
1
Introduction ........................................................................................................................... 3
1.1 SpectraLink e340/h340/i640 Wireless Telephones ..................................................................... 3
1.2 SpectraLink Infrastructure ........................................................................................................... 3
1.3 VIEW Certification Program ........................................................................................................ 4
2 Wireless LAN Layout Considerations ................................................................................ 5
2.1 Coverage ..................................................................................................................................... 5
2.1.1 Overlapping Coverage ............................................................................................................ 5
2.1.2 Signal Strength ....................................................................................................................... 7
2.2 Access Point Configuration Considerations ................................................................................ 8
2.2.1 Channel Selection ................................................................................................................... 8
2.2.2 AP Transmission Power and Capacity ................................................................................... 9
2.2.3 Interference ........................................................................................................................... 10
2.2.4 Multipath and Signal Distortion ............................................................................................. 10
2.2.5 Site Surveys .......................................................................................................................... 11
2.3 Wireless Telephone Capacity ................................................................................................... 11
2.3.1 Access Point Bandwidth Considerations .............................................................................. 12
2.3.2 Push-to-Talk Multicasting Considerations ............................................................................ 13
2.3.3 Telephone Usage .................................................................................................................. 13
2.3.4 Telephony Gateway Capacity ............................................................................................... 14
3 Network Infrastructure Considerations ............................................................................ 15
3.1 Physical Connections ................................................................................................................. 15
3.2 Assigning IP Addresses ............................................................................................................. 16
3.3 Software Updates Using TFTP ................................................................................................. 17
4 SpectraLink Voice Priority (SVP) ...................................................................................... 18
4.1.1 SVP Infrastructure ................................................................................................................. 18
4.1.2 SVP Server Capacity ............................................................................................................ 18
4.1.3 Multiple SVP Servers ............................................................................................................ 18
4.1.3.1 Scenario One ............................................................................................................... 21
4.1.3.2 Scenario Two ............................................................................................................... 21
4.1.4 DSCP for SVP Deployments ................................................................................................ 22
5 Security ............................................................................................................................... 24
5.1 Wired Equivalent Privacy (WEP) ............................................................................................... 24
5.2 Wi-Fi Protected Access (WPA) Personal, WPA2 Personal ...................................................... 24
5.2.1 Cisco Fast Secure Roaming (FSR) ...................................................................................... 24
5.3 Using Virtual LANs .................................................................................................................... 24
5.4 MAC Filtering and Authentication .............................................................................................. 25
5.5 Firewalls and Traffic Filtering .................................................................................................... 25
5.6 Virtual Private Networks (VPNs) ............................................................................................... 25
5.7 Diagnostic Tools ........................................................................................................................ 26
6 Subnets, Network Performance and DHCP ...................................................................... 27
6.1 Subnets and Telephony Gateway Interfaces ............................................................................ 27
6.2 Subnets and IP Telephony Server Interfaces ........................................................................... 27
6.3 Network Performance Requirements ........................................................................................ 28
6.4 DHCP Requirements ................................................................................................................. 29
7 Conclusion .......................................................................................................................... 31
2
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