Allied-telesis AT-8550SP User Manual Page 24
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Overview
24
A port on the switch connected to a powered device can supply up to
15.4 watts of power to the device, while at the same time furnishing
standard 10/100 Mbps Ethernet functionality. A port connected to a
network node that is not a powered device (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.
AT-8524POE’s
Implementation
of PoE
A standard Ethernet twisted pair cable contains four pairs of strands for a
total of eight strands. 10/100 Mbps network traffic requires only four
strands, leaving four strands in the cable unused. The strands that carry
the network traffic are 1, 2, 3, and 6, and the spare strands are 4, 5, 7, and
8.
The IEEE 802.3af standard, which is the standard for PoE, describes two
methods for implementing PoE over twisted pair cabling. One method
uses the same strands that carry the network traffic and the other the
spare strands.
The PoE implementation on the AT-8524POE switch transmits power
over the same strands that carry the network traffic. The power transfer
does not interfere with the network traffic. The power and the network
traffic can coexist on the same strands simultaneously.
Powered devices that comply with the IEEE 802.3af standard typically
support both methods of power delivery methods. So you should not
need to concern yourself about whether a powered device is compatible
with the switch’s power delivery method. So long as a powered device is
compliant with the standard, it should be able to receive its power from
the switch.
The PoE feature on the switch should also work with most legacy
powered devices as well. A legacy device is a node that was
manufactured before the IEEE 802.3af standard was completed and,
consequently, may not adhere to the standard.
Power
Budgeting
The AT-8524POE switch can provide up to a total of 400 watts (W) of PoE
power and a maximum of 15.4 W per port on Ports 1 to 24. (PoE is not
supported on expansion modules.) In the default configuration, the
switch can provide the maximum of 15.4 W on all 24 ports for a total
power requirement of 370 W, which is below the maximum available.
The fact that the maximum possible power requirement falls below the
maximum amount of power available means that you can connect
powered devices to all the ports on the switch (excluding optional
expansion ports) without having to be concerned about exceeding the
available power, even if the all the powered devices require the
maximum of 15.4 W.
- Installation 1
- Statement 3
- Table of Contents 4
- How This Guide is Organized 7
- Document Conventions 8
- Contacting Allied Telesyn 10
- Overview 11
- Model Descriptions 12
- AT-8524M 13
- AT-8550GB 15
- 100-240VAC 16
- RPS INPUT 16
- Hardware Features 17
- Connector 18
- Auto-MDI/ 21
- 100Base-FX Fiber Optic Ports 22
- Power Over Ethernet 23
- AT-8524POE’s 24
- Implementation 24
- Budgeting 24
- GBIC and SFP Expansion Slots 26
- Module Expansion Slots 27
- Fiber Optic Port LEDs 32
- System LEDs 34
- RS-232 Terminal Port 35
- RPS Connector 36
- AC Power Connector 37
- DC Power Connector 38
- MAC Address 39
- Store and 41
- Backpressure 41
- Network Topologies 42
- Collapsed 43
- Backbone 43
- Topology 43
- Reviewing Safety Precautions 46
- Planning the Installation 48
- Unpacking the Switch 50
- AT-8516F/SC 53
- AT-8524M, and 53
- AT-8524POE 53
- 0/100/1000BASE-T 54
- 1000BASE-T 55
- AT-8550SP 58
- Wiring a DC Powered Unit 66
- 8mm ±1mm 67
- (0.31in. ±0.039 in.) 67
- Warranty Registration 71
- Troubleshooting 72
- — Verify that the GBIC 74
- Technical Specifications 77
- Environmental Specifications 78
- Power Specifications 79
- Standards 81
- SNMP Support 82
- RS-232 Terminal Port Pinouts 87
- RPS Connector Port Pinouts 88
- Dual SC Type Connector 91
- Emission Information 92
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