Changes between Version 22 and Version 23 of poe


Ignore:
Timestamp:
04/05/2019 03:23:42 PM (5 years ago)
Author:
Tim Harvey
Comment:

clarified half-rectified 802.3af

Legend:

Unmodified
Added
Removed
Modified

  • poe

    v22 v23  
    3232||          || GW610x  || Passive^^^3^^^ || ||
    3333|| ||
    34 || Ventana  || GW540x  || emulated half-rectified^^^3^^^ 802.3af (both ports) || Jumper^^^1^^^ ||
    35 ||          || GW530x  || emulated half-rectified^^^3^^^ 802.3af (both ports) || Jumper^^^1^^^ ||
    36 ||          || GW52xx  || emulated half-rectified^^^3^^^ 802.3af || Jumper^^^1^^^ ||
     34|| Ventana  || GW540x  || half-rectified^^^3^^^ 802.3af (both ports) || Jumper^^^1^^^ ||
     35||          || GW530x  || half-rectified^^^3^^^ 802.3af (both ports) || Jumper^^^1^^^ ||
     36||          || GW52xx  || half-rectified^^^3^^^ 802.3af || Jumper^^^1^^^ ||
    3737||          || GW51xx  || half-rectified^^^3^^^ Passive ||  ||
    3838||          || GW552x  || half-rectified^^^3^^^ Passive (both ports) ||  ||
    3939|| ||
    4040|| Laguna   || GW2388  || half-rectified^^^3^^^ Passive (both ports) || Jumper^^^2^^^ ||
    41 ||          || GW2386  || full-rectified emulated 802.3af || Jumper^^^2^^^ ||
    42 ||          || GW2387  || full-rectified emulated 802.3af || Jumper^^^2^^^ ||
    43 ||          || GW2391  || full-rectified emulated 802.3af || Jumper^^^2^^^ ||
     41||          || GW2386  || full-rectified 802.3af || Jumper^^^2^^^ ||
     42||          || GW2387  || full-rectified 802.3af || Jumper^^^2^^^ ||
     43||          || GW2391  || full-rectified 802.3af || Jumper^^^2^^^ ||
    4444||          || GW2380  || Passive^^^3^^^ (up to 42V) || Jumper^^^2^^^ ||
    4545||          || GW2382  || Passive^^^3^^^ (up to 42V) || Jumper^^^2^^^ ||
    … …  
    6262
    6363
    64 [=#emulation]
    65 == Emulated 802.3af ==
    66 Originally, true 802.3af was costly and difficult to co-exist with passive PoE, so Gateworks designed a circuit that emulated it by providing the 'signature' needed to make an 802.3af PoE compliant switch enable power. The circuit used on the boards that use this emulation provides a 'class 0' signature but does not provide a 2-event class and PoE signature which may make it fail to turn-on  certain 802.3af power adapters.
     64[=#half-rectified]
     65== Half Rectified 802.3af ==
     66Originally, true 802.3af was costly and difficult to co-exist with passive PoE, so Gateworks designed a circuit that emulated it by providing the 'signature' needed to make an 802.3af PoE compliant switch enable power. The circuit used on the boards that use this emulation provides a 'class 0' signature but does not provide a 2-event class and PoE signature required for 802.3at. Additionally because it is only half-rectified it will not work on 802.3af switches and power adapters that use the opposite polarity.
    6767
    68 While the 802.3 spec calls out the power pins explicitly it does not call out polarity because it also requires full rectification (which makes polarity a moot point). This created the fact that some products use one polarity and others use opposite with regards to + and - voltage rails (see here http://pinouts.ru/Net/poe_pinout.shtml). Some of our emulated 802.3af products do not have this full rectification for space reasons which can make them in-compatible with PoE on some devices without the use of a 'cross-over cable'.
     68While the 802.3 spec calls out the power pins explicitly it does not call out polarity because it also requires full rectification (which makes polarity a moot point). This created the fact that some products use one polarity and others use opposite with regards to + and - voltage rails (see here http://pinouts.ru/Net/poe_pinout.shtml). Some of our 802.3af products do not have this full rectification for space reasons which can make them in-compatible with PoE on some devices without the use of a 'cross-over cable'.
    6969
    70 Refer to the [#gateworks table above] to find which boards use emulated 802.3af and note in the table that some of the above products feature a jumper 'W1' which enables 802.3af emulation ULVO (under voltage lockout). This jumper needs to be in the correct position (or removed) see above table depending on the board and whether or not you want passive PoE or 802.3af emulation.
     70Refer to the [#gateworks table above] to find which boards use half rectified 802.3af and note in the table that some of the above products feature a jumper 'W1' which enables 802.3af emulation ULVO (under voltage lockout). This jumper needs to be in the correct position (or removed) see above table depending on the board and whether or not you want passive PoE or 802.3af emulation.
    7171
    7272The following switch products use the opposite polarity that Gateworks uses and thus requires either a) a fully rectified emulation (see above), b) a crossover cable, c) a [http://shop.gateworks.com/index.php?route=product/product&product_id=129 GW16090] revB+:
    … …  
    8080The Gateworks GW16090 ([http://shop.gateworks.com/index.php?route=product/product&product_id=129 Purchase Here]) allows boards that have no 802.3af/at support to be powered by an 802.3af/at switch or boards that only support 802.3af to be powered by an 802.3at switch. The GW16090 uses the Maxim MAX5969B PoE PD Interface Controller which provides both 802.3af and 802.3at signatures to the PSE device. For more info on the controler see: http://www.maximintegrated.com/en/products/power/switching-regulators/MAX5969B.html
    8181
    82 The GW16090 is only intended with purely passive PoE Ethernet ports and is not meant to be compatible with ports with emulated 802.3af or ports with true 802.3af/at and using it on those ports would be invalid and may need to unexpected results due to signature resistor conflicts.
     82The GW16090 is only intended with purely passive PoE Ethernet ports and is not meant to be compatible with ports with half rectified 802.3af or ports with true 802.3af/at and using it on those ports would be invalid and may need to unexpected results due to signature resistor conflicts.
    8383
    8484For a list of products that the GW16090 has been validated with please see [#testing below].
    8585
    8686Notes:
    87  * Prior to revB only half wave [wiki:poe#Emulated802.3af 802.3a emulation] was supported.
    88  * Prior to revD only [wiki:poe#Emulated802.3af 802.3a emulation] was supported.
     87 * Prior to revD only [wiki:poe#half-rectified half rectification] was supported.
    8988 * It is critical that any external connections (eth, jtag, serial, etc) to the product being powered by the GW16090 are electrically isolated.  Otherwise ground-loops can occur causing power failure at the switch and possible board damage.  This is particularly an issue with PoE switches that use !Power/Ground polarity opposite of what Gateworks uses for Passive PoE.
    9089
    … …  
    104103|| ||
    105104||[https://www.amazon.com/gp/product/B071D2ST49/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1 ANVISION 48V 0.8A 802.3af/at GigE PoE Injector] || Passive || integrated power supply (despite advertised as 802.3af/at complient this is passive) ||
    106 ||[https://www.tp-link.com/us/products/details/cat-43_TL-POE150S.html TP-LINK TL-PoE150S 802.3af GigE  PoE Injector 48V 0.35A] || 802.3af || external supply provided, not compatible with emulated 802.3af^^^2^^^ ||
     105||[https://www.tp-link.com/us/products/details/cat-43_TL-POE150S.html TP-LINK TL-PoE150S 802.3af GigE  PoE Injector 48V 0.35A] || 802.3af || external supply provided, not compatible with half-rectified 802.3af^^^2^^^ ||
    107106||[http://brashnetworks.com/product/brash-networks-bn-pe901g-high-power-802-3at-power-over-ethernet-poe-gigabit-power-injector/ Brash Networks BN-PE901G 802.3at GigE PoE Injector 52V 30W]|| 802.3af/at || integrated power supply ||
    108107||[https://www.amazon.com/gp/product/B01DW99IPS/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 Ubiquiti Networks GP-A240-050G Passive GigE PoE Injector 24V 0.5A] || Passive || integrated power supply ||
    … …  
    112111|| [https://shop.gateworks.com/index.php?route=product/product&path=70_73&product_id=17 GW10054 GigE Ethernet Passive POE Injector] || Passive || requires external power supply ||
    113112 1. Requires cross-over cable if using with a Gateworks board on a port that has half-rectified passive PoE (ie Ventana)
    114  2. This product is not compatible with the [#emulated emulated 802.3af] used on certain Ventana and Laguna products
     113 2. This product is not compatible with the [#half-rectified half rectified 802.3af] used on certain Ventana and Laguna products