34 Keysight M8000 Series of BER Test Solutions User Guide
2 Know Your Hardware
AXIe Embedded System Module (USB ESM)
The bottom slot of the AXIe chassis is reserved for the Embedded System
Module (ESM) which is factory-installed. The ESM has a USB 2.0 interface
as well as a PCIe x8, Gen1 and Gen2 compliant interface to connect an
external host computer to the chassis. The following figure shows the PCIe
Port and USB Port in ESM.
The ESM:
• runs the chassis embedded operating system which manages all
internal tasks and communications.
• tracks inserted modules and manages power requirements.
• monitors chassis temperature and controls variable-speed chassis fans.
• monitors module sensors and reports component failures to a system
log.
• acts as a Gigabit Ethernet switch; forwards frames along the backplane.
• connects an external host computer to the chassis.
• synchronizes timing across all modules through the Keysight Trigger
Bus, using an internal or external clock source.
• LAN connector on AXIe ESM is not used. Only use LAN connection on
the host computer.
• Either the PCIe (desktop only) or USB (desktop or laptop) port can be
used in this ESM but not both simultaneously. When you use the PCIe
port, the USB port is automatically disabled until the PCIe port is no
longer in use.
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