Upgrade to the four lines to the PoE: you need to know the content
Over the years, you've been deployed to support Ethernet power supply for all kinds of equipment,
The cable equipment, such as VoIP phone and security cameras.
So far, you need to support up to 30 watts of power, but now there are a large number of devices can take advantage of the higher level of PoE, such as the latest 802.
Fi access points, digital display, and even the desktop computer -
The client requires the use of four lines of PoE.
You may have heard something about four lines of PoE application performance and heat dissipation problem of gossip, and a little worried about whether you deploy wiring equipment is ready for the new series of equipment power supply for the customer.
You should know -
Higher power levels of the four lines of PoE and always not perfect.
We deeply know the next.
Select the type you like first, we come to know about the differences between different types of PoE.
Type 1 PoE can provide up to 15.
4 W power, of which 13 W for device, while Type 2 PoE (
Sometimes referred to as PoE +)
Can provide up to 30 W power, of which 25.
5 W can be used for equipment.
Both use two lines to transmit power, using one of the above two options -
Plan A and B.
Plan A, the use of line 1
2 and 3 -
6 for power supply and data transmission at the same time.
Plan B, the use of standby line of 4 -
5, and 7 -
8 for power supply.
Plan A compatible with two lines of (
For example base - 10/100
And four lines of (
For example base - 1000
Application, and plan B compatible use only two lines of the data signal.
Has put forward four line of PoE 802.
3 bt standard includes Type 3 and Type 4 two types, both can use four wire for power supply and data transmission at the same time.
Type 3 PoE can provide up to 60 w power, can be used in the equipment, including 51 w and Type 4 can provide up to 90 w power, of which 71 w can be used in the equipment.
Ensure that use A balance Type 1 and Type 2 PoE, by applying on two lines of common-mode voltage to transmit power -
Means that the current evenly distributed between the two wire.
Therefore, line internal dc resistance of each wire must balance (
, any resistance difference is called the dc resistance unbalance.
Serious imbalance will make data signal distortion, which leads to the error, retransmission or even data link failure.
With Type 1 and Type 2 A PoE similar, four-wire Type 3 and Type 4 PoE also through common mode voltage to provide power, so the dc resistance unbalance is also very important.
But, in the Type 3 and Type 4, you not only have to worry about the dc resistance of each pair of lines is not balanced.
Multiple lines of the dc resistance of serious imbalance between will cause serious damage to the data transmission and leads to PoE to stop working.
Although the conductor diameter and concentricity (
Inconsistent inferior cable at a higher risk of unbalanced dc resistance, but the single conductor is not properly and consistently placed within the IDC, lead to termination does not agree, can also cause unbalanced dc resistance.
So while you may see the dc resistance of the cable supplier imbalance index, but the field test is installed the only way to ensure that the performance of unbalanced dc resistance.
Fortunately, the DSX2 - of the network
8000 CableAnalyzer ?
Copper internal authentication tester can be quickly and easily test line and line of the dc resistance unbalance between, so you can be at ease completely to ensure your deployed two line cable equipment will support for and application of PoE at four o 'clock.
Need to know more information, unfortunately, unbalanced dc resistance is not the only thing you need to worry about.
When PoE USES twisted-pair copper wiring, cable temperature will result in insertion loss increased.
This may cause channel insertion loss test fails, or need to shorten the length of the cable.
As transmission of PoE more cables are closely tied together, PoE the heat generated by the more serious -
The greater the power, the greater the fever.
The national electrical code, 60 w or higher level of PoE of cables is allowed in the depends on the number of cable wire size and rated temperature.
UL also launched a limited power (
Rating is used to verify the cable over each line of the specific electrical flow temperature rating, TIA is set limit cable bundle of temperature rise of guide.