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IX5-28GPX Installation Guide
25
The cable requirements for ports operating at 1000Mbps are given in
Table 3.
Power Budget The AT-IX5-28GPX switch has a power budget of 720 watts when two
power supply modules are installed. This is the maximum amount of power
the switch can provide at one time to the powered devices.
Two power supplies must be installed for the switch to provide the full 720
watts. Each power supply is responsible for providing 360 watts, or half, of
the power budget. The power budget is reduced to 360 watts if only one
power supply is installed.
The power requirements of the PoE devices determine the maximum
number of devices the switch can support at one time. So long as the total
power requirements of the powered devices is less than the power budget
of the switch, the switch can supply power to all the devices. But if the total
power requirements exceed the power budget, the switch denies power to
one or more ports using a mechanism referred to as port prioritization.
To determine whether the power requirements of the PoE devices you
plan to connect to the switch exceed its power budget, refer to their
Table 3. Twisted Pair Cable Requirements for the 10/100/1000Base-T
Ports at 1000Mbps
Cable Type
1000Mbps
Non-PoE PoE PoE+
Cat 3: Standard TIA/EIA 568-B-
compliant Category 3 shielded
or unshielded cabling with 100
ohm impedance and a
frequency of 16 MHz.
No No No
Cat 5: Standard TIA/EIA 568-A-
compliant Category 5 shielded
or unshielded cabling with 100
ohm impedance and a
frequency of 100 MHz.
Yes Yes No
Cat 5e: Standard TIA/EIA 568-
B-compliant Enhanced
Category 5 (Cat 5e) shielded or
unshielded cabling with 100
ohm impedance and a
frequency of 100 MHz.
Yes Yes Yes
Cat 6 or 6a: Standard TIA/EIA
568-B-compliant Category 6 or
6a shielded cabling.
Yes Yes Yes