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HP ProCurve 3500-24 Reference Manual Page 16

Hp procurve 3500-24: reference guide.
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Rather than duplicate status information and control buttons on each of the dual management modules, the
System Support Module creates a common location for:
• System "Reset" and "Clear" buttons
• Status LEDs for internal power supplies, external power supply (EPS), fabric and interface modules
• LED Mode indicators (which dictate the function of the Mode LED on individual ports) to indicate activity (Act),
full-duplex operation (FDx), speed (Spd), delivery of PoE power (PoE), and a configurable User Mode (Usr)
All components contained on the SSM are very low failure rate functions (as evidenced from the very low failure
rate of HP ProCurve 5400zl series chassis and predecessor chassis products) . But in the event of a failure
of any of these components, this module can be replaced without removing any network cables or interface
modules—as required by other competitor designs when there is a need to service some components mounted
to the backplane .
Since the SSM is a required module for the operation of the Switch 8212zl chassis, it is not a hot-swappable
module . Although no damage will occur to the chassis if the SSM is removed during operation, its removal will
indeed power down the system (similar to pulling a sole management module with no standby MM in place) .
To prevent the accidental removal of the module, the SSM is mounted to the chassis with tamper-resistant
screws (TRSs) . TRSs also contribute to the low failure rate probability for the SSM . Contributors to module failure
included static discharge through user handling or misalignment of pins upon reinsertion .
Figure 5. Tamper-Resistant Torx-20 screws and wrench (included with spare SSM)
Slotted/Torx-10 screws
Tamper-Resistant Torx-20
(used on other modules)
(only on the SSM)
For TORX screws with
Center Security Pin
As with many critical components, a best practice would be to have a spare SSM onsite, and HP ProCurve
includes a TRS wrench with every separately purchased J9095A module should you ever need to replace a
failed SSM . All other modules can be removed by using a blade screwdriver or T10 Torx driver .
Figure 6. Close-up of System Support Module (SSM) in a typical state
User Mode (Usr) will be enabled in a future software release.


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