Planet FSD-804P [16/21] The poe provision process
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5. THE POE PROVISION PROCESS
While adding PoE support to networked devices is relatively painless, it should be realized that power cannot simply be
transferred over existing CAT-5 cables. Without proper preparation, doing so may result in damage to devices that are not
designed to support provision of power over their network interfaces.
The PSE is the manager of the PoE process. In the beginning, only small voltage level is induced on the port's output, till a
valid PD is detected during the Detection period. The PSE may choose to perform classification, to estimate the amount of
power to be consumed by this PD. After a time-controlled start-up, the PSE begins supplying the 48 VDC level to the PD, till
it is physically or electrically disconnected. Upon disconnection, voltage and power shut down.
Since the PSE is responsible for the PoE process timing, it is the one generating the probing signals prior to operating the
PD and monitoring the various scenarios that may occur during operation.
All probing is done using voltage induction and current measurement in return.
Stages of powering up a PoE link
Stage Action
Volts specified
per 802.3af
Volts managed
by chipset
Detection
Measure whether powered device has the correct signature
resistance of 15–33 kΩ
2.7-10.0 1.8–10.0
Classification
Measure which power level class the resistor indicates 14.5-20.5 12.5–25.0
Startup
Where the powered device will startup >42 >38
Normal operation
Supply power to device 36-57 25.0–60.0
5.1 Line Detection
Before power is applied, safety dictates that it must first be ensured that a valid PD is connected to the PSE's output. This
process is referred to as "line detection", and involves the PSE seeking a specific, 25 KΩ signature resistor. Detection of
this signature indicates that a valid PD is connected, and that provision of power to the device may commence.
The signature resistor lies in the PD's PoE front-end, isolated from the rest of the the PD's circuitries till detection is certi-
fied.
5.2 Classification
Once a PD is detected, the PSE may optionally perform classification, to determine the maximal power a PD is to consume.
The PSE induces 15.5-20.5 VDC, limited to 100 mA, for a period of 10 to 75 ms responded by a certain current con-
sumption by the PD, indicating its power class.
The PD is assigned to one of 5 classes: 0 (default class) indicates that full 15.4 watts should be provided, 1-3 indicate
various required power levels and 4 is reserved for future use. PDs that do not support classification are assigned to class
0. Special care must be employed in the definition of class thresholds, as classification may be affected by cable losses.
Classifying a PD according to its power consumption may assist a PoE system in optimizing its power distribution. Such a
system typically suffers from lack of power resources, so that efficient power management based on classification results
may reduce total system costs.
Содержание
- Fsd 804p 1
- Port 10 100mbps with 4 port poe fast ethernet switch 1
- User s manual 1
- Ce mark warning 2
- Disclaimer 2
- Fcc warning 2
- Revision 2
- Trademarks 2
- Weee warning 2
- Appendix a networking connection 9 3
- Appendix b 1 3
- Hardware description 3
- Introduction 3
- Power over ethernet overview 4 3
- Switch operation 3 3
- Table of contents 3
- The poe provision process 6 3
- Troubleshooting 8 3
- Checklist 4
- Features 4
- How to use this manual 4
- Introduction 4
- Emi safety 5
- Operating environment 5
- Operating humidity 5
- Poe power output 5
- Poe power supply type 5
- Poe standard 5
- Power budget 5
- Power pin assignment 5
- Specification 5
- Standard compliance 5
- Storage environment 5
- Storage humidity 5
- Front panel 6
- Hardware description 6
- Led indicators 6
- Per 10 100mbps port 6
- Product description 6
- System 6
- And have a fan hole on the rear panel 7
- Base tx 7
- Before start up 7
- Cabling 7
- Hardware installation 7
- Power notice 7
- Rear panel 7
- Desktop installation 8
- Rack mounting 9
- Connecting end node or switch 10
- Product application 10
- Power over ethernet powered device 12
- Address table 13
- Auto negotiation 13
- Forwarding filtering 13
- Learning 13
- Store and forward 13
- Switch operation 13
- Power over ethernet overview 14
- What is poe 14
- Classification 16
- Line detection 16
- The poe provision process 16
- Operation 17
- Power disconnection scenarios 17
- Start up 17
- Base tx port link led is lit but the traffic is irregular 18
- Performance is bad 18
- The link led is not lit 18
- Troubleshooting 18
- What is the power output of each ieee 802 af poe port 18
- Why i connect my poe device to fsd 804p and it cannot power on 18
- Why the switch doesn t connect to the network 18
- A data out poe switch rj 45 port pin assignments port 1 to port 4 19
- A rj 45 cable pin assignment 19
- A switch s rj 45 pin assignments port 5 to port 8 19
- Appendix a networking connection 19
- Figure a 1 straight through and crossover cable 20
- Orange 20
- Please make sure your connected cables are with same pin assignment and color as above picture before deploying the cables into your network 20
- Side 1 20
- Side 2 20
- Straight cable side 1 side2 20
- There are 8 wires on a standard utp stp cable and each wire is color coded the following shows the pin allocation and color of straight cable and crossover cable connection 20
- White blue 20
- White brown 20
- White green 20
- White orange 20
- White orange 2 green 3 white orange 4 blue 5 white blue 6 orange 7 white brown 8 brown 20
- White orange 2 orange 3 white green 4 blue 5 white blue 6 green 7 white brown 8 brown 20
- Appendix b 21
- B power over ethernet compatibility test 21
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