Link5000 Series: PoE Configuration Guide

Link5000 Series: PoE Configuration Guide

Chapter 1 PoE Configuration

1.1 Introduction to PoE

PoE (Power over Ethernet) is an IEEE802.3at/af technology to provide direct current for some IP-based terminals (such as IP phones, Access Points and network cameras) while transmitting data to them. Such DC-receiving devices are called PD (Powered Device). The max distance of reliable power supply provided by PoE is 100 meters.

1.2 PoE Configuration

The PoE Configuration Task List:

  1. Globally enable or disable PoE
  2. Globally Set the Max Output Power
  3. Globally set power management mode
  4. Globally set non-standard PD detection mode
  5. Globally enable or disable the allowed high-inrush current when nonstandard PD is powered instantaneously
  6. Enable or disable PoE on specified ports
  7. Set the max output power on specified ports
  8. Set the power priority on specified ports
  9. Globally Enable or Disable PoE

CLI Command and Explanation

Command Explanation
Global Mode  
power inline enable

no power inline enable

Enable/disable PoE globally.

 

  1. Globally set the max output power
Command Explanation
Global Mode  
power inline max <max-wattage>

no power inline max

Globally set the max output power of PoE.

 

  1. Globally set the power management mode
Command Explanation
Global Mode  
power inline police enable

no power inline police enable

Enable/disable the power priority management policy mode.

 

  1. Globally set non-standard PD detection mode
Command Explanation
Global Mode  
power inline legacy enable

no power inline legacy enable

Set whether or not to provide power for non-standard IEEE PD.

 

  1. Globally enable or disable the allowed high-inrush current when nonstandard PD is powered instantaneously
Command Explanation
Global Mode  
power inline high-inrush enable

no power inline high-inrush enable

Enable/disable the allowed high-inrush current when nonstandard PD is powered instantaneously.

 

  1. Enable or disable PoE on specified ports
Command Explanation
Port Mode  
power inline enable

no power inline enable

Enable/ disable PoE.

 

  1. Set the max output power on specified ports
Command Explanation
Port Mode  
power inline max <max-wattage>

no power inline max

Set the max output power on specified ports.

 

  1. Set the power priority on specified ports
Command Explanation
Port Mode  
power inline priority {critical | high | low} Set the power priority on specified ports.

 

1.3 Typical Application of PoE

Requirements for Network Deployment

Set the max output power of any Link5000 Series. The power output can be found on the product, datasheet, or ICCN website.

Ethernet interface 0/0/2 is connected to an IP phone.

Ethernet interface 0/0/4 is connected to a wireless AP.

Ethernet interface 0/0/6 is connected to a Bluetooth AP.

Ethernet interface 0/0/8 is connected to a network camera.

The IP phone connected to the Ethernet interface has the highest-level of power supply priority – critical.

If a new device is added, the PSE will have a power overload.

Power of subordinate AP devices connected to Ethernet interface 0/0/6 should not exceed 9000mW.

 

Topology of Network

Configuration Steps:

Globally enable PoE:

LINK5010AS-POE(Config)# power inline enable

Globally set the max power to150W:

LINK5010AS-POE(Config)# power inline max 150

Globally enable the priority policy of power management:

LINK5010AS-POE(Config)# power inline police enable

Set the priority of Port 0/0/2 to critical:

LINK5010AS-POE(Config-Ethernet0/0/2)# power inline priority critical

Set the max output power of Port 0/0/6 to 9000mW:

LINK5010AS-POE(Config-Ethernet0/0/6)# power inline max 9000

1.4 PoE Troubleshooting Help

If problems occur when on using PoE, please check:

  • Based on the total power budget of the Link5000 switch: When the less than 15W is remaining the power supply to new PDs will be cut off based on ‘first come first serve’. The existing low priority devices will also be disconnected in priority policy mode. If the Power Remaining is over 15W, say 16W, any newly connected device with a power no more than 15W can get its power supply normally, without affecting other devices. Such a power supply buffer of 15W is designed for power source protection and should be monitored.
  • The displayed power may be over the max value. This is due to the relationship between the displayed power and the actual power, for instance:

The power set on the port: A, represents the actual output PoE power

The displayed power: B, represents the total power of the port (total current × total voltage)

The power loss set on the port: C, represents power loss of the internal Sensor ohmic resistance, MosFet etc.

Then: B=A+C

If the power is set as A=500mW, according to the following table, the compensating current will be I=2.44mA (500mW/50V=10mA assuming the current working voltage is 50V), plus the compensating power C=50V×2.44mA=122mA

B=A+C=500+122=622mW. So, only when the displayed power reaches 622mW, will the PD will be disconnected

 

Table:

Max Working Current (mA) Compensating Current (mA)
50 2.44
100 4.88
150 9.76
200 17.08
250 24.41
350 31.73

 



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