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HP ProCurve 2520 Planning And Implementation Manual: Power Redundancy For The 2910al Switches

Procurve power over ethernet (poe/poe+).
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PoE Capabilities of the Products

Power Redundancy for the 2910al Switches

The internal power supply in these switches provides both the 12V (RPS) and
54V (EPS) circuits. If the 54V portion of the power supply fails, it will only shut
down the PoE connections. However, if the 12V portion of the power supply
fails, it will shut down the entire switch. Therefore it is important to provide
a redundant power supply for both the 12V and 54V circuits. It is recommended
that both EPS and RPS be connected to provide full redundancy.
HP ProCurve Redundant/External Power Supplies (RPS/EPS) can be
connected to the 2910al Switches for redundant 12 V system power (RPS) and
to provide for additional PoE+ provisioning. For RPS power, the 2910al
Switches can be connected to either an HP ProCurve 620 RPS/EPS or HP
ProCurve 630 RPS/EPS. For additional PoE+ EPS power, only the 630 can be
used. The 620 does not provide 54 V for PoE+, only 50 V for PoE, and the 2910al
Switches do not support connections to the 620 for EPS.
The 2910al switch provides up to 30W from each port (25.5W for PD, 4.5W for
cable dissipation); the number of ports that can be operated at full power is
limited to 12 ports at full power, and/or 24 ports at 15.4W. To increase the
capacity of the switch, an external power supply can be attached to double
the total system capacity to 24 ports at 30W, or 48 ports at 15.4W.
The power supplies for these switches are optimized to provide the most
efficient and cost effective solution.


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