User Manual
Table Of Contents
- Cambium
- PMP 450 Planning Guide
- Accuracy
- Copyrights
- Restrictions
- License Agreements
- 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
- Cambium main website: http://www.cambiumnetworks.com/
- Sales enquiries: solutions@cambiumnetworks.com
- Email support: support@cambiumnetworks.com
- Cambium Networks
- 3800 Golf Road, Suite 360
- Rolling Meadows, IL 60008
- Chapter 1: Product description
- Chapter 2: 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
- Planning for RADIUS integration
- Planning for SNMP security
- Ordering components
- Chapter 3: 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 4: Reference information
Grounding and lightning protection Planning considerations
2-32
pmp-0047 (December 2012)
Lightning protection zones
The ‘rolling sphere method’ (Figure 16) is used to determine where it is safe to mount equipment. An imaginary
sphere, typically 50 meters in radius, is rolled over the structure. Where the sphere rests against the ground and a
strike termination device (such as a finial or ground bar), all the space under the sphere is considered to be in the
zone of protection (Zone B). Similarly, where the sphere rests on two finials, the space under the sphere is
considered to be in the zone of protection.
Figure 16 Rolling sphere method to determine the lightning protection zones
Assess locations on masts, towers and buildings to determine if the location is in Zone A or Zone B:
• Zone A: In this zone a direct lightning strike is possible. Do not mount equipment in this zone.
• Zone B: In this zone, direct EMD (lightning) effects are still possible, but mounting in this zone significantly
reduces the possibility of a direct strike. Mount equipment in this zone.
Never mount equipment in Zone A. Mounting in Zone A may put equipment, structures and life at risk.