User Manual
Table Of Contents
- Contents
- List of figures
- List of tables
- About this document
- ipBTS system overview
- Planning
- ipBTS C30 installation
- RN commissioning
- Requirements
- CLI connection
- Establishing a console connection
- Connecting the laptop to the ipBTS C30
- Downloading and activating new software
- Verifying SNTP time
- Commissioning the ipBTS C30
- Performing Loopback tests
- The loopback test process
- Backhaul loopback testing
- Ethernet loopbacks
- Looping back Ethernet backhaul links
- Looping back at the Ethernet port
- Entering diagnostic mode and configuring test parameters
- Performing external loopback tests on backhaul links
- Troubleshooting failed backhaul links
- Removing physical loopbacks
- Configuring IP on the Ethernet port and laptop
- Establishing the CLI/SSH/Ethernet connection
- Updating node software
- RN hardware components
- RN Specifications
- Hot-swapping ipBTS hardware
- Index
Chapter 4 l RN commissioning
Performing Loopback tests
Airvana ipBTS C30 Installation and Commissioning, Release 4.0 4-15
Physical loopbacks are created by physically connecting the positive transmit wire to the
positive receive wire and connecting the negative transmit wire to the negative receive wire.
NOTE
Loopbacks must be installed on all Ethernet backhaul cables. There is one Ethernet
backhaul cable on non-redundant systems; there are two on redundant systems.
1. Create the Loopback connector.
• If the Ethernet at the point of the loopback installation has an RJ-45 connector on the
far end, create a loopback connector using the pin-out in Table 4-1 on page 4-4.
• If the Ethernet backhaul(s) have a different connector, create a loopback connector as
appropriate.
2. Install the loopback connector onto the far end of each Ethernet cable.
Looping back at the Ethernet port
To install a physical loopback at the Ethernet port in preparation for running external loopback
tests on Ethernet backhaul links, simply connect the loopback connector to the appropriate
port.
For information about how to create Ethernet loopback connectors, see Table 4-1 on page 4-4.
NOTE
When looping back at the port, the loopback test does not test the cable wired into the port
or the or backhaul cables. This is the least desirable location to install the loopback and
should only be used if the other options are not available.
Entering diagnostic mode and configuring test parameters
This procedure explains how to initiate a hard reset and use the CLI to enter diagnostics mode.
NOTE
To perform Loopback tests, you must have a serial connection to the ipBTS C30.
Follow this procedure to enter diagnostics mode and configure test parameters.
1. Press the <Enter> key on your laptop to ensure the CLI session is active.
The command prompt displays, which indicates the session is active.
2. Enter reboot to reboot the ipBTS C30.
The CLI console displays the ipBTS C30’s booting sequence. There is a three-second
window during which you can select diagnostics mode. Prior to starting the three-second