User guide

Restoring, upgrading and rebooting Chapter 7: Operation
7-70
phn-2513_004v000 (Oct 2012)
If the 1+1 Hot Standby link is operational, upgrade the units in the following order:
1
Disable local and remote protection switching. See Enabling and disabling fault
protection on page 7-43.
2
If link planning indicates that the inactive units are able to operate a link of
satisfactory quality, go to step 3. Otherwise, force a protection switch at one
end of the wireless link, as described in Forcing protection switches on page 7-
37, so that the link is operating between a primary and a secondary unit.
3
Upgrade software on the remote inactive CMU, then on the local inactive CMU.
4
Force a protection switch at both ends to inactive CMUs and check that the link
is working.
5
Upgrade software on the remote (formerly active) CMU, then on the local
(formerly active) CMU.
6
Test that the upgrade is successful as follows:
If the coupler is symmetric, or if the coupler is asymmetric but the secondary
units provide a good quality link, perform these tests:
a. Force a local protection switch and check that the link is working.
b. Force a protection switch at the other end of the wireless link to return
to the initial configuration.
If the couper is asymmetric, or if the antenna is protected and the inactive
neighbor has a lower capacity:
a. Force a combined protection switch and check that the link is working.
Force a local end protection switch so that the optimum performing units are in
use, that is, Primary to Primary.
7
Re-enable local and remote protection switching.
After reboot of software on an operational 1+1 Hot Standby link which requires new RFU
firmware, do not re-enable protection switching until after the inactive unit firmware
upgrade has been completed. Otherwise, the RFU will reset after the firmware upgrade,
potentially causing a protection switch.
Checking the recovery version
To confirm the recovery software version, select menu option System, Software Upgrade
and note the Recovery Software Image attribute.