User Guide

Contents PMP 450 Planning Guide
iv
pmp-0047 (December 2012)
Remote Authentication Dial In User Service (RADIUS) ....................................................................................... 1-21
SNMP ..................................................................................................................................................................... 1-21
Network Time Protocol (NTP) ............................................................................................................................... 1-21
Wireless Manager (WM) ........................................................................................................................................ 1-22
Capacity upgrades .................................................................................................................................................. 1-25
Software upgrade .................................................................................................................................................... 1-25
Further reading on system management ................................................................................................................. 1-25
Chapter 2: Planning considerations ........................................................................... 2-1
Regulatory planning ......................................................................................................................................................... 2-2
Obeying Regulatory limits........................................................................................................................................ 2-2
Conforming to the limits........................................................................................................................................... 2-2
Network migration planning ............................................................................................................................................ 2-3
Example PMP 450 deployment scenario .................................................................................................................. 2-3
Sector capacity.......................................................................................................................................................... 2-5
Site planning .................................................................................................................................................................. 2-11
AP or SM site selection .......................................................................................................................................... 2-11
Power supply site selection..................................................................................................................................... 2-11
Maximum cable lengths.......................................................................................................................................... 2-11
Wind loading .......................................................................................................................................................... 2-11
Link planning ................................................................................................................................................................. 2-14
Range and obstacles ............................................................................................................................................... 2-14
Path loss considerations .......................................................................................................................................... 2-16
Calculating maximum power level for connectorized AP units ............................................................................. 2-16
Understanding Attenuation ..................................................................................................................................... 2-17
Calculating Link Loss ............................................................................................................................................. 2-17
Calculating Rx Signal Level ................................................................................................................................... 2-17
Calculating Fade Margin ........................................................................................................................................ 2-18
Analyzing the RF Environment ..................................................................................................................................... 2-18
Mapping RF Neighbor Frequencies........................................................................................................................ 2-18
Analyzing the spectrum .......................................................................................................................................... 2-19
Anticipating Reflection of Radio Waves ................................................................................................................ 2-20
Noting Possible Obstructions in the Fresnel Zone .................................................................................................. 2-20
Multiple OFDM Access Point Clusters .................................................................................................................. 2-21
Planning for co-location and using the OFDM Frame Calculator Tool.................................................................. 2-23
Selecting Sites for Network Elements ............................................................................................................................ 2-26
Surveying Sites ....................................................................................................................................................... 2-27
Clearing the Radio Horizon .................................................................................................................................... 2-27
Calculating the Aim Angles ................................................................................................................................... 2-28
Diagramming Network Layouts ..................................................................................................................................... 2-29
Avoiding Self Interference ..................................................................................................................................... 2-29
Avoiding Other Interference ................................................................................................................................... 2-30
Grounding and lightning protection ............................................................................................................................... 2-31
The need for power surge protection ...................................................................................................................... 2-31
Standards ................................................................................................................................................................ 2-31