User Manual

1X UBS Macro B T S FRU UBS Macro B T S Product Ov erview
XMI (Transceiver Module Internal) module
The UBS Macro XMIs are available in either the 800 MHz or 1.9 GHz RF band. The XMI
requires +27 V DC input operating power .
The XMI provides both the baseband transceiver and linear power amplifier functionality for the
BTS . This functionality is integrated within a single module. The XMI supports either a three
sector antenna configuration or an Omni (single sector) antenna configuration.
The XMI receiver is capable of supporting four carriers in the three -sector configuration and
eight carriers in the Omni configuration. On the forward link side, XMI can support up to
eight carriers in the three -sector configuration.
The XMI supports P A trunking, which enables dynamic TX RF power sharing among all
sector -carriers. An advantage of P A trunking is that power can be distributed among
sector -carriers with different loads. The built -in redundancy of trunking is also an advantage. If
one of the XMIs internal power amplifiers fails, all sector -carriers served by that XMI can still
operate at reduced power on the remaining power amplifiers. The XMI will generate a system
alarm to alert the operator of the failure condition, but will stay in service.
The XMI provides main and diversity receivers for three sectors. The UBS Macro BTS frame
supports soft -fail redundancy at the receiver level. If either the main and diversity receive path
fails, the XMI continues to operate with one receive path, but at reduced performance instead of
taking the entire XMI out -of -service.
68P09283A64 -3 1 -19
FOA SEP 2007