Manual

XMI (T r ansceiv er Module Internal) Module Chapter 7: XMI R eplacement Procedures
XMI (Transceiver Module Internal) Module
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XMI Description
The XMI is available in either the 800 MHz or 1.9 GHz RF band.
The XMI contains sector RF transceivers and integrated sector TX RF Linear P ower Amplifiers
(LP As).
The XMI provides the BTS site RF air -interface for subscriber units and a high speed serial data
interface for transporting baseband data between the sector transceivers and the DMI modems.
One XMI is equipped for the low capacity UBS Macro frame. (See Figure 1 -1 UBS Macro BTS
low -tier/low -capacity frame (1000 mm rack) on page 1 - 27 and Figure 1 -2 Low capacity UBS
Macro BTS starter frame (1800 mm rack) on page 1 - 28 .)
T wo XMIs are equipped for the mid capacity UBS Macro frame. (See Figure 1 -3 UBS Macro BTS
mid -capacity frame (1800 mm rack) on page 1 - 30 .)
The XMI can support a UBS Macro frame in either an omni (1 -sector) or 3 -sector antenna
configuration.
An XMI in a UBS Macro frame can support the following quantity of carriers per sector:
• F or the 800 MHz and 1.9 GHz RF bands, one XMI in a 3 -sector antenna configuration can
support 4 carriers with reduced TX RF power output per sector -carrier and up to 3 carriers
with full TX RF power output per sector -carrier .
• F or the 800 MHz RF band, 8 carriers per sector for an omni (1 -sector) antenna
configuration.
• F or the 1.9 GHz RF band, 5 carriers per sector for an omni (1 -sector) antenna configuration.
The XMI transceiver uses receive diversity for each sector .
F or transmit, the XMI transceiver typically provides 2 - 30 W transmit RF output power per
sector/carrier (120 W total available RF power , when measured at the output of the UBS Macro
frame). In a 3 -sector antenna configuration, the maximum TX RF power per sector -carrier is
20W .
The XMI operates from +27 V DC input power .
All external XMI I/O connections are made on the XMI front panel.
7 -2 68P09283A64 -3
FOA SEP 2007