User's Manual
Table Of Contents
- Introduction
- Product Description
- Technology and Benefits
- Applications
- Configuration Options – RF, IP, DFS
- Power and Grounding
- Administration Systems
- Specifications
- Radio specifications (common to all formats)
- Specifications for PMP 430 (5.4 & 5.8-GHz) SM and PTP 230 (5.4 & 5.8-GHz) BH radio with integrated antenna
- Specifications for PMP 400 (4.9 & 5.4-GHz) AP/SM and PTP 200 (4.9 & 5.4-GHz) BH radio with integrated antenna
- Specification for PMP 400/430 AP and PTP 200 BH connectorized radio
- Specifications for PMP 400/430 kitted, connectorized radio (antenna included)
- Performance
- Planning
- Configuring
- Installation
- Regulatory and Legal Notices
- Important Note on Modifications
- National and Regional Regulatory Notices
- U.S. Federal Communication Commission (FCC) Notification
- Industry Canada (IC) Notification
- Regulatory Requirements for CEPT Member States (www.cept.org)
- European Union Notification for 5.8 GHz Product
- Equipment Disposal
- EU Declaration of Conformity for RoHS Compliance
- UK Notification
- Luxembourg Notification
- Czech Republic Notification
- Greece Notification
- Brazil Notification
- Labeling and Disclosure Table for China
- Exposure Separation Distances
- Legal Notices
- Limit of Liability
PMP 400/430 and PTP 200/230 Series Motorola PMP Solutions User Guide Supplement
Issue 6.0 May 2011 Page 54 of 77
PMP 400 Series networks use a cyclic prefix of 1/4 that is not configurable by the operator.
PMP 430 and PTP 230 Series networks use a default cyclic prefix of 1/4 that is configurable by
the operator to 1/8 or 1/16. The Cyclic Prefix is set on the Configuration => Radio page on the
AP. Changing the default from 1/4 to 1/8 can increase throughput by ~2 Mbps (assuming 75%
duty cycle in PMP 430 networks) in installations with low multipath conditions. It is recommended
to test 1/8 or 1/16 cyclic prefix to determine actual performance based on RF conditions.
PTP 200 Series modules (OFDM BHs) are settable for either 1/8 or 1/4 cyclic prefix. The use of
1/8 cyclic prefix provides about 11% higher maximum throughput, and is recommended for
backhaul operations in most cases.
The Cyclic Prefix is set on the Configuration => Radio page of the BHM.
The default on a new unit or when the unit is reset to factory defaults is 1/4 Cyclic Prefix.
In most deployments, 1/8 or 1/16 Cyclic Prefix will provide a high quality, higher
throughput link. In cases with severe multi-pathing or obstructions, 1/4 Cyclic Prefix may
give better overall results.
Procedure for setting the Cyclic Prefix
Set the Cyclic Prefix on the Configuration => Radio page of both the BHM and the BHS
to 1/8 before deployment.
IMPORTANT!
The Cyclic Prefix must be set the same on both the BHM and the BHS.
If they don’t match, the BHS will not register to the BHM.
During installation use Link Tests to confirm link quality per standard installation and
alignment procedures.
If a Link Test shows low throughput or efficiency, consider changing the Cyclic Prefix to
1/4 on both the BHM and the BHS along with other standard installation
troubleshooting procedures such as re-aiming, off-axis aiming, changing location,
raising or lowering the height of the radio, adjusting Transmission Power up or
down, or identifying and mitigating sources of interference.