Chapter : Chapter 1: Overview
28
Powered device
classes
Powered devices are grouped into the five classes listed in Table 2 on
page 28. The classes are based on the amount of power the devices
require. The GS970M Series PoE switch
es support all five classes.
T
ABLE 2. IEEE POWERED DEVICE CLASSES
Class
Maximum power output
fro
m a switch port
PD power range Margin of cable loss
0 15.4W 0.44W to 12.95W 0.8W
1 4.0W 0.44W to 3.84W 0.2W
2 7.0W 3.84W to 6.49W 0.4W
3 15.4W 6.49W to 12.95W 0.8W
4 30.0W 12.95W to 25.5W 1.2W
Cable
requirements
Cable requirements for ports operating at 10 or 100Mbps are in Table 3.
Cable requirements for ports operating at 1000Mbps are in Table 4.
T
ABLE 3. TWISTED PAIR CABLE REQUIREMENTS FOR THE 10BASE-T AND 100BASE-TX PORTS AT 10
OR 100MBPS
Cable type
10Mbps 100Mbps
Non
PoE
PoE PoE+
Non
PoE
PoE PoE+
Cat 3: Standard TIA/EIA 568-B-compliant
Ca
tegory 3 shielded or unshielded cabling
with 100 ohm impedance and a frequency of
16 MHz
Yes Yes No Yes Yes No
Cat 5: Standard TIA/EIA 568-A-compliant
Ca
tegory 5 shielded or unshielded cabling
with 100 ohm impedance and a frequency of
100 MHz
Yes Yes No Yes Yes No
Cat 5e: Standard TIA/EIA 568-B-compliant
En
hanced Category 5 (Cat 5e) shielded or
unshielded cabling with 100 ohm
impedance and a frequency of 100 MHz
Yes Yes Yes Yes Yes Yes
Cat 6 or 6a: Standard TIA/EIA 568-B-
compliant Categ
ory 6 or 6a shielded cabling
Yes Yes Yes Yes Yes Yes
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