Installation Instructions

1X UBS Macro B T S FRU Modem Boards
The modem replacement scenario is as follows:
1. Remove the affected DMI assembly from the DMI outer housing located in the UBS
Macro BTS frame.
2. Replace Modem 1 or Modem 2, whichever is applicable, in the affected DMI assembly .
3. Install the affected DMI assembly equipped with the replacement modem into the DMI
outer housing located in the UBS Macro BTS frame.
System impact/considerations
If the UBS Macro BTS frame is equipped with one DMI, then performing this
replacement procedure will cause BTS downtime and suspend all call processing .
If the UBS Macro BTS frame is equipped with two DMIs, then performing this
replacement procedure for the Site Master DMI will temporarily cause BTS downtime.
This is due to soft reset of the non -Site Master DMI during the DMI swap procedure.
As soon as the DMI swap procedure is finished, the non -Site Master DMI becomes
the Site Master DMI and call processing resources are available, but temporarily
reduced until the failed DMI is replaced.
P erforming this replacement procedure for a non -Site Master DMI will not cause
BTS downtime, but call processing resources will be temporarily reduced until the
failed DMI is replaced.
The affected DMI assembly must be removed from the UBS Macro BTS frame.
Call traffic processing through the site will be temporarily interrupted by the modem board
replacement procedure.
Alarms will be generated during the modem board replacement procedure.
The DMI is not hot swappable.
DMI removal requires shutting down DC power to the DMI as well as disconnection of all
DMI cables.
All call traffic processing through the site will be interrupted by the DMI removal.
Table 8 -4 Modem Board R eplacement Conditions
FRU
Ref Designator What to Shutdown...
1X Modem Board Modem 1 or Modem
2
From the OMCR, lock the affected DMI being
removed. Then shut down the DMI DC input
power .
68P09283A64 -3 8 -21
FOA SEP 2007