Agilent Technologies E6630A, Getting Started Manual

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Quick-Start
1
Getting Started Guide 11
The multiport adapter splits the downlink RF signal from the test set’s source into eight
RF output paths. All eight output paths can be active at once, or the user can activate a
subset of them in any desired combination. Each path interfaces to an RFIO port through
a coupler, so that the RFIO port can also return an uplink signal to the analyzer in the test
set. (Usually an RFIO port is either an input or an output at any given time, but in
LTE-FDD applications is can serve as both at once.) The coupler in the RF output path
can be bypassed by a high-power output-only path (this output-only path cannot be
selected directly by the user; it is activated automatically, as needed, during LTE-TDD
measurements).
Alternatively, the downlink RF signal from the test set’s source can be sent through a
4-way splitter to the four GNSS outputs of the multiport adapter. (This path
can be
directly selected by the user.)
Each of the eight RF Uplink RF signals is directed back to the test set through one of the
eight selectable RF input paths. Each path leads through a coupler to a set of RF
switches, and is returned to the test set’s analyzer.
NOTE
Downlink and uplink signals are handled slightly differently by the multiport adapter.
Downlink signals from the test set’s source are split so as to provide a stimulus output to
as many as eight ports at the same time. Uplink signals to the test set’s analyzer,
however, are switched rather than split, and at a given time the analyzer receives an
input from only one of the eight RFIO ports of the multiport adapter.