Installation Instructions

Modem Boards Chapter 8: DMI R eplacement Procedures
Modem Boards
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The R20 UBS Macro BTS supports frame configurations with DMIs having up to two
modem boards that can be either 1X CDMA modem, EV -DO modem, or one of each.
1X Modem Board Description
The UBS Macro BTS frame DMIs may be equipped with up to two modem boards maximum.
These modem boards can be either 1X CDMA modem, EV -DO modem, or one of each.
The DMIs are located in the right side of the XMI shelf in the UBS Macro BTS frame (see
Figure 1 -1 UBS Macro BTS low -tier/low -capacity frame (1000 mm rack) on page 1 - 27 , Figure 1 -2
Low capacity UBS Macro BTS starter frame (1800 mm rack) on page 1 - 28 and Figure 1 -3 UBS
Macro BTS mid -capacity frame (1800 mm rack) on page 1 - 30 ).
Each frame DMI includes a DMI assembly that slides into a DMI outer housing. The frame
version DMI assembly consists of a chassis with a controller board, two rear mounted cooling
fans, a front panel and up to two modem boards that can be either 1X CDMA modem, EV -DO
modem, or one of each.
Each modem board mounts on opposite sides of the controller board. Modem board -to -controller
board electrical connection is via a printed circuit board mounted High Density Mezzanine
(HDMEZZ) type connector . Each modem board is secured to the DMI assembly chassis with
seven screws that are captivated to the modem board.
Figure 8 -3 Removing and installing Modem 1 on page 8 - 28 and Figure 8 -4 Removing and
installing Modem 2 on page 8 - 29 show the locations of Modem 1 and Modem 2 within the
DMI assembly .
The following rules apply to modem board location within the DMI:
• F or a DMI equipped with one 1X CDMA modem board, the 1X CDMA modem
board is always Modem 1 location
• F or a DMI equipped with one EV -DO modem board, the EV -DO modem board
is always Modem 2 location
• F or a DMI equipped with a combination of one 1X CDMA modem board and one
EV -DO modem board, the 1X CDMA modem board is always Modem 1 location
and the EV -DO modem board is always Modem 2 location
8 -20 68P09283A64 -3
FOA SEP 2007