PoE/PoE+ Planning and Implementation Guide 2011-09

2-10
Operating Rules
Provisioning Power for PoE
Table 2-3. Maximum Power Allocations
PoE Power Requirements
It is important to understand the PoE power requirements of these switches
because if the PoE power is not planned and implemented correctly, end
devices connected to the PoE switch ports may not receive power if a switch
PoE power source failure occurs or if the switch is over provisioned.
The Switch 2600-8-PWR has 8 ports and its internal PoE power supply provides
126 watts across all 8 ports. If a 600 RPS/EPS or a 610 EPS device is connected
to the Switch 2600-8-PWR for the purpose of supplying external power to the
PoE portion of the switch, there will be either 408 watts or 204 watts of power
available should the switch’s internal PoE power supply fail. If a single switch
is connected to the EPS ports on the 600 RPS/EPS or a single port of a pair on
the 610 EPS, 408 watts are available, providing fully redundant PoE power to
the switch.
If two switch devices are connected to the EPS ports on the 600 RPS/EPS or
to both ports of a pair on the 610 EPS, only 204 watts are provided to the switch
if the internal PoE power supply fails. This will still provide enough wattage
to be a full PoE backup for the Switch 2600-8-PWR because it only needs 126
watts.
PoE Devices Internal Only Internal and EPS EPS Only
PoE for Switch
2600-8-PWR
126 watts available to
ports 1-8.
126 watts available to
ports 1-8 (provided by the
internal source). 408/204*
watts available, provided
by the EPS source.
The internal power supply has
failed, and the EPS provides
408/204* watts to ports 1-8.
PoE for Switch
2626-PWR
406 watts available to
ports 1-24.
Redundant 408/204*
watts available to ports 1-
24. Only if the internal
power supply fails.
408/204* watts available to
ports 1-24. (The EPS provides
PoE power to ports 1-24 only if
the internal power supply
fails.)
PoE for Switch
2650-PWR
406 watts available to
ports 1-48.
406 watts available to
ports 1-24 (provided by
the internal source). 408/
204* watts available to
ports 25-48 (provided by
the EPS source).
The internal power supply has
failed, and the EPS provides
408/204* watts to ports 1-48.
Note that 38 watts of this
power are always allocated
exclusively to ports 1-24 or 25-
48.)
* If both EPS ports on the 600 RPS/EPS or both ports of a pair on the 610 EPS are connected to switches, each switch
can receive 204 watts of power. If a single switch is connected to the EPS ports, that switch can receive 408 watts.