More and more active equipment and devices are accepting and requiring a Power Over Ethernet (POE) supply. It is important for the user to have the assurance that their cables will be compatible with the electrical power required by the devices.
Depending on the ranges and categories, the PATCHSEE, DESKPATCH and ThinPATCH cables are manufactured with 24, 26 and 28 gauges (American Wire Gauge: AWG) for ThinPATCH thin cables. The higher the figure, the thinner the copper in the pair conductors.
We are mainly focused on cables with a gauge of. AWG 28. He who can do more can do less.
In September 2005, the IEEE 802.3at working group officially started working on the PoE + pre-standard to take into account the use of 2 pairs of the Cat 5 Ethernet cable to provide a current of 1250 mA and a power of 60 W to powered equipment. This is to expand the market with more devices and therefore more potential customers.
To date, two standards govern the interoperability of equipment:
IEEE 802.3af (PoE): The electrical supply provided by the equipment (switch, injector) is a maximum of 15.4 W. The voltage is 48 V.
IEEE 802.3at (PoE+): If the equipment supplying the power supply and the device both meet this standard, then a power between 24 and 30 W can be used, always for a voltage of 48 V.
Standard IEEE P802.3bt, also called 4PPoE (4-Pair Power over Ethernet), or PoE++ by extending the name PoE+ of standard IEEE 802.3at, introduces two additional levels of maximum power delivered by the switch, type 3 with 55 W (with a maximum current per pair of 600 mA) and type 4 with 90 W (with a maximum current per pair of 960 mA) distributed over the 4 pairs of the Ethernet cable.
Compared with the PoE and PoE + standards that use two pairs out of four, with equal power output, the 4PPoE improves overall energy efficiency because the losses are halved. For a constant current, the power effectively delivered on four pairs is higher than that available on two pairs.
Approved in March 2017, TSB-184-A provides recommendations for twisted-pair cables that support and power direct current, as well as data routed to networked devices in new installations and applications. It also provides recommendations for managing temperature rises in cables and maintaining operation below maximum temperatures.
|Number of Cables in bundle||Temperature Rise (°C)|
|600mA per pair||720mA per pair||1000mA per pair|
Following TSB-184-A directives, the remote power supply can be provided via cabling without compromising performance or functionality.
TSB-184-A makes specific recommendations, such as:
Finally, TIA/EIA, AWG 28 patch cords, which are popular in high-density patch areas because of their smaller diameter that helps reduce congestion, improve airflow and reduce the curvature radius, are also now recognised in a normative annex to TIA/EIA-568.2-D.
The standard introduces the idea of “asymmetric DC resistance” within a pair. This is the difference in resistance (on a direct current) of two wires in a pair that must not exceed a certain value. More practically, the standard recommends that the pairs used for POE have similar electrical resistances.
“ Hi Frederic To be honest I was a bit disappointed of the lamination within the tool included in demo kit. However I had the chance to test the real tool on a recent trip and that worked much better. I also discovered that the company already are using the patchsee cables and they have already proven to be very handy Best regards Marius N. ”
Marius N - Network Operations Manager - MOBILE SATELLITE COMMUNICATIONS - Norway
“ Hi Laetitia, I was already familiair with PatchSee and we have it in production. The kit was for a colleague of mine who wanted to test it as well, he may be ordering soon. ”
Patrick V - Senior System Engineer - international retailorganisation - Netherlands (The)
“ Hi Yes and thank you for the demo kit. Product is good as expected. Right now we are in planning stage and after some calculations I can send amounts of cables that we need. To who I can send my request? BR Henri R ”
Henri R - IT Manager - MODULAR HOUSE MANUFACTURER - Estonia
“ Hi Frederic, I think that your patchsee idea is a brilliant solution to help locate cabling especially when it extends in more then one cabinet. In Italy is called a Columbus’s egg. I did hear it from a network technician who passed by, and seeked it in Internet. I am now seeking some reseller in Italy to have an idea of the price. Can you hint me who to contact first? Paolo P ”
Paolo P - IT Field Support - AGRICULTURAL PRODUCTS MANUFACTURERS - Italy
“ Dear Ms Lecourt, Thank you for this opportunity to present this ingenious solution by our company. I use patchsee cabel for a long time and i’m totally enthused how simple cable management could be. :) But sometime, at a new company, It is very helpful to be able to visualise how patchsee works. Thant you very much for your demo kit. Yours sincerely, ”
Dimitrijs K - Projektleiter - TEXTILE - Germany
“ Dear Laetitia Lecourt, Thanks you very much for sending the free demo kit. We received it and liked the concept. Since we are upgrading and replacing our network, we would like to test the usage of patchsee to quickly identify network connections on our core switches. We found Patchsee via a website of a dutch network cable reseller. Regards, Jeroen ”
Jeroen H - System Administrator - MUNICIPALITY - Netherlands (The)
“ Hello Mrs Lecourt, I liked the easy traceability of the cables when installed into a rack. I will definitely consider your solution next time we need to order new patch cables. Your solution was recommended by a colleague from our branch in the UK. Mit freundlichen Grüssen / Best regards Stefan IT Administrator ”
Stefan C - IT Administrator - ELECTRONIC PRODUCTS - Germany