Manual

1X UBS Macro B T S FRU XMI (T r ansceiv er Module Internal) Module
XMI High -speed Serial data Links (HSL)
The XMI has redundant 1.2288 Gbps high -speed serial data links, one link per HSL 1 and HSL 2
data ports on the front panel of the XMI. These data ports, on the XMI, are connected to the
high -speed serial data interface on the DMIs.
The high -speed serial data link has a multiplexed serial data signal that contains RX/TX
sector -carrier traffic and overhead data as well as any DMI/XMI communications data.
TX Input Signal Flow
The multiplexed TX baseband serial data signal is applied, via the high -speed serial data
interface, to the input of the Serializer/De -serializer & Data Multiplexer/De -multiplexer . This
stage demultiplexes and deserializes the TX baseband serial data signal into TX baseband I
& Q output signals for each sector -carrier .
Each sector -carrier TX baseband I & Q signal is applied to the TX baseband control array . This
array conditions and combines all of the TX I & Q signals and then selectively routes them to a
pair of quadrature signal outputs for the appropriate sector (i.e., one pair per sector).
Each pair of quadrature signals is applied to the corresponding sector RF transmitter . The
quadrature signals are D/A converted and the resultant analog signal causes the sector
transmitter to output a low power multiplexed TX RF signal with the applicable FM modulated TX
carrier frequencies. This low power multi -carrier signal is referred to as the TX RF small signal.
68P09283A64 -3 7 -5
FOA SEP 2007