Allied Telesis Switch AT-SBXPWRSYS1 User Manual Page 39
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SwitchBlade x3112 Installation Guide
39
Power over Ethernet on the AT-SBx31GP24 Line Card
This section applies only to the AT-SBx31GP24 PoE Line Card. The
twisted-pair ports on the line card support Power over Ethernet (PoE). PoE
is a mechanism by which the ports supply power to network devices over
the twisted pair cables that carry the network traffic. This feature can
simplify network installation and maintenance because it allows you to use
the switch as a central power source for other network devices.
Devices that receive their power over Ethernet cables are called powered
devices (PD), examples of which include wireless access points, IP
telephones, web cams, and even other Ethernet switches. A PD
connected to a port on the switch receives both network traffic and power
over the same twisted-pair cable.
The AT-SBx31GP24 Line Card automatically determines whether a device
connected to a port is a PD. A PD has a signature resistor or signature
capacitor that the line card can detect over the Ethernet cabling. If the
resistor or capacitor is present, the switch assumes that the device is a
PD.
A port connected to a network node that is not a PD (that is, a device that
receives its power from another power source) functions as a regular
Ethernet port, without PoE. The PoE feature remains enabled on the port
but no power is delivered to the device.
Powered Device
Classes
The IEEE 802.3af and 802.3at standards define five powered device
classes. The classes are defined by the power requirements of the
powered devices. The classes are shown in Table 3. The AT-SBx31GP24
Line Card supports all five classes.
Table 3. IEEE802.3af and IEEE802.3at Powered Device Classes
Class Usage
Maximum
Power Output
on the PoE
Port
PD Power
Range
0 Default 15.4W 0.44W to
12.95W
1 Optional 4.0W 0.44W to 3.84W
2 Optional 7.0W 3.84W to 6.49W
3 Optional 15.4W 6.49W to
12.95W
4 Optional 30.0W 12.95W to
25.9W
- Installation Guide 1
- Radiated Energy 3
- Industry Canada 3
- Translated Safety Statements 4
- Contents 5
- List of Figures 10
- List of Tables 14
- Contacting Allied Telesis 17
- Overview 19
- Introduction 20
- Figure 5. Fan Module 22
- AT-SBx3112 Chassis 23
- Supplies 24
- Ethernet Line 25
- Cards Slots 25
- Power Supply 25
- Chapter 1: Overview 26
- AT-SBx31GT24 Line Card 27
- AT-SBx31GT40 Line Card 28
- AT-SBx31GP24 PoE Line Card 29
- AT-SBx31GS24 SFP Line Card 30
- AT-SBx31GC40 Line Card 31
- AT-SBx31XZ4 XFP Line Card 33
- AT-SBx31XS6 SFP+ Line Card 34
- Distance 36
- Requirements 36
- Automatic MDIX 37
- Detection 37
- Straight-through 37
- Powered Device 39
- AT-SBx31GT24 44
- Line Card 44
- AT-SBx31GT40 45
- AT-SBx31GP24 46
- AT-SBx31GS24 48
- AT-SBx31GC40 49
- AT-SBx31XZ4 51
- AT-SBx31XS6 51
- SBx STATUS 55
- NET MGMT 58
- Console (RS-232) 60
- SanDisk 2GB Flash card 61
- SanDisk 4GB SDHC Flash card 61
- Power Supplies 62
- AT-SBxFAN12 Module 65
- Chapter 2 69
- Reviewing Safety Precautions 70
- Chapter 3 77
- Required Tools and Material 78
- Preparing the Equipment Rack 79
- 311.1 mm (12.25“) 80
- 152.4 mm (6”0) 80
- 463.5 mm (18.25”) 80
- Removing the Shipping Brace 89
- Installing the Power Supplies 93
- Ethernet Line Cards 113
- Fabric Controller Card 118
- Chapter 6 127
- SBx31GT40 Line Cards 128
- Connecting 129
- Cables to the AT 129
- SBx31GT40 Line 129
- Chassis” on page 153 152
- Powering On the Chassis 153
- Verifying the Installation 154
- Connecting the 166
- Grounding Wire 166
- Choosing a 167
- Method for 167
- Attaching the 167
- Power Wires 167
- DC Power Wires 168
- Terminals 168
- Angle Terminals 175
- Connecting Bare 180
- Using the LEDs 185
- Initialization 185
- Using the Console 186
- Port to Monitor 186
- Chapter 8 189
- Starting a Local 192
- Management 192
- Entering the 193
- Software 193
- Commands 193
- Troubleshooting 197
- AT-SBxPWRSYS1 DC Power Supply 199
- Chapter 9: Troubleshooting 200
- Twisted Pair Ports 203
- Power Over Ethernet 205
- Fiber Optic Transceivers 207
- AT-SBxFAN12 Fan Module 210
- Technical Specifications 213
- Environmental Specifications 215
- Power Specifications 216
- PoE Mode 218
- Port Pinouts 220
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