User Guide
Table Of Contents
- Cambium
- PMP 450 Planning Guide
- Accuracy
- Copyrights
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- High Risk Materials
- Safety and regulatory information
- Contents
- List of Figures
- List of Tables
- About This Planning Guide
- PMP support website: http://www.cambiumnetworks.com/support
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- Address:
- Chapter 1: Planning considerations
- Regulatory planning
- Network migration planning
- Site planning
- Link planning
- Analyzing the RF Environment
- Selecting Sites for Network Elements
- Diagramming Network Layouts
- Grounding and lightning protection
- Configuration options for TDD synchronization
- Data network planning
- Security planning
- Isolating APs from the Internet
- Managing module access by passwords
- Filtering protocols and ports
- Port Lockdown
- Isolating SMs
- Filtering management through Ethernet
- Allowing management from only specified IP addresses
- Configuring management IP by DHCP
- Planning for airlink security
- Planning for RF Telnet Access Control
- Forwarding Downlink PPPoE PADI packets
- Planning for RADIUS integration
- Planning for SNMP security
- Ordering components
- Chapter 2: Legal information
- Cambium Networks end user license agreement
- Acceptance of this agreement
- Definitions
- Grant of license
- Conditions of use
- Title and restrictions
- Confidentiality
- Right to use Cambium’s name
- Transfer
- Updates
- Maintenance
- Disclaimer
- Limitation of liability
- U.S. government
- Term of license
- Governing law
- Assignment
- Survival of provisions
- Entire agreement
- Third party software
- Hardware warranty
- Limit of liability
- Cambium Networks end user license agreement
- Chapter 3: Reference information
PMP 450 Planning Guide
Link planning
This section describes factors to be taken into account when planning links, such as range, obstacles, path loss
and throughput.
Range and obstacles
Calculate the range of the link and identify any obstacles that may affect radio performance.
Perform a survey to identify all the obstructions (such as trees or buildings) in the path and to assess the risk of
interference. This information is necessary in order to achieve an accurate link feasibility assessment.
The PMP 450 Series is designed to operate in Near-Line-of-Sight (nLOS), Non-Line-of-Sight (NLOS) and Line-
of-Sight (LOS) environments. An NLOS environment is one in which there is no optical line-of-sight, that is,
there are obstructions between the antennas. See Figure 1 Line Of Sight Diagram.
OFDM technology can often use multi-pathing to an advantage to overcome nLOS, especially in cases where
the Fresnel zone is only partially blocked by buildings, “urban canyons”, or foliage. OFDM tends to help
especially when obstacles are near the middle of the link, and less so when the obstacles are very near the SM or
AP.
However, attenuation through walls and trees is substantial for any use of the 2.4 GHz, 3.5 GHz, 3.6 GHz, 5.4
GHz, and 5.8 GHz frequency bands. Even with OFDM, these products should not be expected to penetrate
walls or extensive trees and foliage.
pmp-0047 (March 2014)
1-71