User Manual

Chapter 13 ● Loopback testing backhaul links
158 Release 2.0, 910056 Rev01d
Understanding the backhaul link loopback test process
This process explains the steps you should follow for performing loop back tests. Loopback testing each
backhaul link is recommended to ensure correct installation and operation at the physical layer.
1. Understanding the backhaul loopback process
This section explains the T1/E1 loopback testing process.
See Understanding backhaul loopback testing
on page 159.
See Understanding a typical T1/E1 backhaul network
on page 160.
See Understanding Ethernet loopbacks
on page 160.
2. Install external loopbacks on each backhaul cable
• If the backhaul cables are T1 or E1, go to Looping back T1/E1 backhaul links
on page 161
• If the backhaul link(s) are Ethernet, go to Looping back Ethernet backhaul links
on page 162
3. Preparing for loopback tests
Enter CLI diagnostic mode and configure the test parameters.
See Entering diagnostic mode and configuring test parameters
on page 163.
4. Running loopback tests on each backhaul
Perform the loopback test for all backhaul links.
See Performing external loopback tests on backhaul links
on page 164.
5. Troubleshooting failed backhaul link(s)
Take additional steps to troubleshoot and correct any backhaul link(s) that failed the external loopback
tests.
See Troubleshooting failed backhaul links
on page 166.
6. Removing physical loopbacks
The external loops at the far end of all cables must be removed.
See Removing physical loopbacks
on page 168
This procedure is complete. You must complete the commissioning. Go to Understanding the
commissioning completion process on page 188.