1.3. 500 Series Models and Differences

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There are two revisions of the 500 Series model:

The older 500 Revision A (500A).
The newer 500 Revision B (500B).

	Important: Some earlier cOS Core versions are not supported
The supported cOS Core versions are as follows: The 500A can run any cOS Core version from 14.00.04 onwards. The 500B can run any cOS Core version from 15.00.00 onwards. Earlier versions than those stated above are not supported and a downgrade should not be attempted.

Important: Some earlier cOS Core versions are not supported

The supported cOS Core versions are as follows:

The 500A can run any cOS Core version from 14.00.04 onwards.
The 500B can run any cOS Core version from 15.00.00 onwards.

Earlier versions than those stated above are not supported and a downgrade should not be attempted.

500B Differences

The principal differences in the 500B when compared with the 500A are as follows:

Interfaces G1 to G4 now support 2.5 Gigabit Ethernet (2.5GBase-T)

	Warning: The 500B is NOT an identical replacement for the 500A
When replacing an older 500A unit with a newer 500B unit, there are differences between the two models. Using a high availability cluster with Rev.A and Rev.B devices is NOT supported. HA clusters must consist of either two Rev.A devices or two Rev.B devices.

Warning: The 500B is NOT an identical replacement for the 500A

When replacing an older 500A unit with a newer 500B unit, there are differences between the two models. Using a high availability cluster with Rev.A and Rev.B devices is NOT supported.

HA clusters must consist of either two Rev.A devices or two Rev.B devices.

	Note: Images Are From Revision A
	The images in this guide were taken from a Rev.A hardware device. Hardware revisions may differ slightly from the images in this guide.