Airvana ipBTS C30, Installation And Commissioning Manual

Page: 53 / 90

Chapter 4
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RN commissioning
Performing Loopback tests
Airvana ipBTS C30 Installation and Commissioning, Release 4.0 4-13
1. Understanding the backhaul loopback process.
2. Install external loopbacks on each backhaul cable.
This section describes how to create and install loopback connectors on each backhaul
cable.
• For information about looping back Ethernet backhaul link(s), see Looping back
Ethernet backhaul links on page 4-14
• For information about looping back at the Ethernet port, see Looping back at the
Ethernet port on page 4-15
3. Preparing for loopback tests.
This section describes how to enter CLI diagnostic mode and configure the test
parameters.
For more information, see Entering diagnostic mode and configuring test parameters on
page 4-15.
4. Running loopback tests on each backhaul.
This section describes how to perform the loopback test for all backhaul links.
For more information, see Performing external loopback tests on backhaul links on
page 4-16.
5. Troubleshooting failed backhaul link(s).
This section describes how to take additional steps to troubleshoot and correct any
backhaul link(s) that failed the external loopback tests.
For more information, see Troubleshooting failed backhaul links on page 4-17.
6. Removing physical loopbacks.
This section explains the external loops at the far end of all cables must be removed once
the Loopback testing is complete.
For more information, see Removing physical loopbacks on page 4-19
Once you have reviewed and understand the Loopback test process, continue with Backhaul
loopback testing .
Backhaul loopback testing
Loopback testing each backhaul link is a critical step that must be completed before the
technician leaves the site. These tests ensure the node is functional, the backhaul link(s) are
properly wired into the backhaul and (optionally) that the backhaul cables and any external
equipment to which they attach (up to the loop back point) are operational.
NOTE
This testing does not include backhaul circuits , only physical layer functionality at the cell
site. Backhaul circuits must undergo end-to-end testing and acceptance at the time they are
brought up by the service provider.