User's Manual
Table Of Contents
- ExtendAir® (TDD) Series Digital Microwave Radios Installation and Management Guide
- Legal Notice
- Open-Source License Information
- Table of Contents
- Notes for Customers of the Cisco Configuration ExtendAir r5005
- About this Document
- Introduction
- Pre-installation Tasks
- Link Engineering and Site Planning
- Familiarization with the ExtendAir (TDD) Series Radios
- Initial Configuration and Back-to-Back Bench Test
- Time Division Duplex (TDD) Factors
- Link Orientation and Synchronization
- Radio Synchronization
- Offset Timing
- Virtual Local Area Network (VLAN)
- Simple Network Management Protocol (SNMP)
- System Installation and Initiation Process
- Installation
- Configuration and Management
- Telnet into the Command Line Interface (CLI)
- Telnet
- Exalt Graphical User Interface (GUI)
- Quick Start
- Navigating the GUI
- Radio Information Page
- Administration Settings Page
- NTP and Time Zones Configurations Page
- Simple Network Management Protocol (SNMP) Configuration
- File Management Pages
- File Transfer Page
- File Activation Page
- System Configuration Page
- Ethernet Interface Configuration Page
- T1/E1 Configuration Pages
- VLAN Configuration Page
- Ethernet Rate Limiting
- QoS Configuration Page
- Automatic Channel Selection (ACS) Page
- Syslog Configuration Page
- GPS Information Page
- Alarms Page
- Performance Page
- Event Log Page
- User Throughput Page
- Diagnostic Charts Page
- Spectrum Analyzer Page
- Ethernet Utilization Page
- Reboot Page
- Manual Page
- Specifications
- Interface Connections
- Antennas
- Troubleshooting
- Back-to-back Bench Testing
- General Compliance and Safety
- Dynamic Frequency Selection
- Safety Notices
- Regulatory Notices
- Regulatory Compliance
- Regulatory Domain Keys
- EIRP Limits for the United States and Canada
- EIRP Limits for Australia
- EIRP Limits for the European Union and ITU Countries
- Declaration of Conformity to the R&TTE Directive 1999/5/EC
- Exalt Limited Hardware Warranty Software License and RMA Procedures Agreement
- Copyright Notices
- Index
Exalt Installation and Management Guide
ExtendAir (TDD) Series Digital Microwave Radios
104 203591-010
2012-09-04
contact with the radio, transmission system, or racking system. If touching the radio causes errors,
grounding is the cause. It can be difficult to identify grounding problems, but a professional electrician
can normally inspect a system and identify if there are deficiencies in the grounding system.
Insufficient Link Margin
Ideally, the link was designed with enough link margin (fade margin) to allow for multipath
propagation and atmospheric fading and still remain reliable. In some cases, link margin is
compromised by economic factors, such as using low-cost RF cabling or lower-cost antennas that have
less gain or deficient performance compared to higher cost transmission system components. In some
cases, there may be antenna size restrictions that forced the design to not have the desired amount of
link margin.
If the link was designed with poor link margin, there are likely many cases of bit errors and outages.
The antenna system and transmission line can be upgraded to help reduce this. If the link design was
installed with sufficient margin, but RSL is reduced, the remaining link margin may no longer be
enough to maintain a reliable link. The causes of RSL reduction were previously described, but are
usually due to new path obstruction(s) or antenna misalignment due to wind or mechanical factors. The
antenna height or location can be changed to overcome new obstructions. Realignment of the antenna,
and/or improvement to mechanical structures can help overcome antenna misalignment.
Moisture in the Transmission System
If the connectors on cables and antennas and egress junctions are not properly weatherproofed,
moisture can get into the transmission system and cause significant error conditions and erratic
performance. In many cases, the transmission system must be replaced. A VSWR meter is one means
to identify such issues. Conduct physical inspections often. If changes to the weatherproofing (such as
cracking) are noticed, replace the weatherproofing before leakage occurs.