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2 AXN Quick Start Kit User Guide (BK/0045 | 9 Aug. 2021)
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Above measurements may be rounded and are not inclusive of power connector height. Refer to the
respective chassis data sheet for comprehensive measurements including equivalents in inches.
Figure 2: AXN chassis from 16 user-slot to single-slot Axonite
The design of the AXN allows for any combination of 2U to 16U chassis to be created, in any configuration
including circular chassis for rotor systems.
From the flexibility point of view, AXN is a solid modular chassis, making it easy to add new modules or replace
existing modules without having to dissemble the chassis. AXN modules are designed to be in-service
programmable, so they can be updated with new revisions of firmware in-situ, saving the need to return modules
for updating.
The AXN backplane, is a 1-Gbps point-to-point link for each module. This, while offering a significant increase in
bandwidth available over the backplane, offers the ability to extend the backplane outside the chassis to a single
user-slot chassis that can be placed in restricted places, closer to sensors. These single user-slot chassis are
called Axonites. Axonites can be placed up to 10 meters (33 feet) from the chassis and are powered by the chassis
through a 6-wire interface to the backplane via an extender card placed in the user-slot of the chassis. The 6-wire
cable consists of 2 x TX, 2 x Rx and 2 x power wires. Axonites can house any AXN user module and offer greater
heat dissipation in hot zones due to the greater relative surface area for the module to dissipate heat.
Figure 3: Axonite single user-slot chassis
AXN reliability is guaranteed by building on the heritage of Curtiss-Wright’s Aerospace Instrumentation group. The
Aerospace Instrumentation group is the number 1 provider of FTI worldwide. AXN uses FPGA-based state
machine acquisition engines. These are live at power up, immediately acquiring data after power interrupts.
System wide synchronous sampling is guaranteed across the AXN product line. All parameters are sampled at the
start of the acquisition cycle and then at evenly spaced intervals throughout the cycle. Analog acquisition is
accurate up to 0.02% FSR. Channel density is maintained or increased even with the reduced size of AXN.
As the Axon product family is the next generation data acquisition platform from Curtiss-Wright, it has been
designed from the start to be future proof. This is achieved by using a serial backplane with dedicated 1 Gbps links
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