Agilent Technologies 93000 SOC Series Training Manual page 102

Lesson 1 – Analog Modules
DC Routes (WGA/WGB/WGD)
Loop-back Routes
If you need to connect a single DUT pin to multiple analog
modules or to analog module and digital pin, this connection type
is used.
The multiplexer of an analog module can make the route between
the desired signal pins. The following figure shows possible routes
between signal pins for the digitizer:
Loop-back Routes (WGA/WGB/WGD)
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