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
203591-010 59
2012-09-04
T1/E1 Loopback
Loopback is provided for any enabled T1 or E1 port. As shown in Figure 29 and Figure 30, the choices
are:
• No Loopback (default)
• External (local)
• External (remote)
• Internal
All loopback configurations control the loop at the Line Interface integrated circuit, which is the
device wired directly to the front panel ports.
External loopback modes are used in conjunction with an external test source. The designation of
‘local’ or ‘remote’ refers to where the loopback is occurring relative to the location where the loopback
is implemented. That is, on the radio being accessed, if External (remote) is selected, this loops the
signal back at the remote radio interface back towards the local radio. Likewise, if External (local) is
selected, the signal loops back at the local interface towards the remote radio (Figure 31 and Figure
32).
Figure 31 External (remote) loopback
Figure 32 External (local) loopback
When a local T1/E1 port is configured for External (remote) loopback, it is the same as configuring the
remote radio for External (local) loopback.
Internal loopback uses an internal test source, and sends the test source signal across the link, looped at
the remote radio’s interface, returned to the local radio, and looped at the local radio’s interface back to
the source. The inputs at both ends are looped back at the line level. Figure 33 illustrates the internal
loopback function.
Figure 33 Internal loopback
Note: Only one Internal loopback can be enabled at any time.