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
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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
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- Conditions of use
- Title and restrictions
- Confidentiality
- Right to use Cambium’s name
- Transfer
- Updates
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- Term of license
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- Survival of provisions
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- Third party software
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- Limit of liability
- Cambium Networks end user license agreement
- Chapter 3: Reference information
PMP 450 Planning Guide
Visual line of sight does not guarantee radio line of sight.
Surveying Sites
Factors to survey at potential sites include
• what pre-existing wireless equipment exists at the site. (Perform spectrum analysis.)
• whether available mounting positions exist near the lowest elevation that satisfies line of site, coverage,
and other link criteria.
• whether you will always have the right to decide who climbs the tower to install and maintain your
equipment, and whether that person or company can climb at any hour of any day.
• whether you will have collaborative rights and veto power to prevent interference to your equipment from
wireless equipment that is installed at the site in the future.
• whether a pre-existing grounding system (path to Protective Earth ) exists, and what is required to
establish a path to it.
• who is permitted to run any indoor lengths of cable.
Clearing the Radio Horizon
Because the surface of the earth is curved, higher module elevations are required for greater link distances. This
effect can be critical to link connectivity in link spans that are greater than 8 miles (12 km).
To use metric units to find the minimum height required to reach the radio horizon use the following equation:
Radio horizon distance (km) = 4.12 (SQRT(h1) + SQRT(h2))
Where:
Is:
h1 height of the AP
h2 height of the SM
To use English standard units to find the angle of elevation, use the following formula:
Radio horizon distance (km) = 1.42 (SQRT(h1) + SQRT(h2))
Where:
Is:
h1 height of the AP
h2 height of the SM
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pmp-0047 (March 2014)