Please can anyone tell me if they have managed to power a Ruckus 7942 Access Point using power over Ethernet – and how they did it.
Also is it possible to configure the 7942 Access Point to power another device from its PoE port such as a camera. In other words, can the Ruckus power devices using its PoE Ethernet port.

many thanks

Phil

The 7942 AP is 802.3af (Power over Ethernet) compliant and can work with any standard-based PoE switch. Keep in mind the 7942 cannot source PoE for other devices such as cameras etc; you will need to power those devices separately.

You can find the 7942 datasheet on http://www.ruckuswireless.com/products/zoneflex… (right hand side column).

Ruckus Support

I did some tests with midspan PoE-injectors with different Ruckus APs.
The AP2942 worked well with all used injectors while the AP7942 has GigE ports and does not accept power on spare wires, only “phantom power”.
So with the AP 7942 you will need PSEs with “phantom power” injection like PowerDsine7001 series.
You can find more information on PoE

The Blue Parrot

I’m also having trouble powering a Ruckus 7942 from a certain PSE.

My 7942s can be powered from a Linksys PoE switch I had lying around but not from an Adtran NetVanta 1234 (http://tinyurl.com/dxrpc9).

The Adtran PSE can power other PDs. I’ve tried two VoIP phones and another manufacturers AP. They all power up without issue.

There must be some incompatibilty between the Adtran 1234 and the 7942. Both claim 802.3af compliance however.

I am looking into possibly using some of these in a college dorm setting. Can you tell me how like them? Any issue? I will be serving about 1200 students. Thanks for any input you may have

We run wireless networks in multiple MDUs that I would describe as college apartment buildings. Our most recent install was in a 465 unit building using 43 2942s and one 7942 controlled by a ZD3050. The 7942 got installed by mistake as it got mixed in with our 2942 inventory somehow but It powers fine over POE. I will have it changed out the next time I have a tech in the building but one of the problems with Ruckus is that you never have techs in the building because it just works. We have been running wireless networks in buildings like this for years and have never found a product that comes anywhere near the Ruckus line. I would love to be installing 7942s but we just cant cost justify it. If it is within budget, go with the 7942s but be nice to yourself and others and run them at 20MHz.

hey guys, i just bought this for my 8AP’s/7942. Linksys SRW2024P Managed Ethernet Switch PoE. is this good enough?

We have had very good luck with the DLINK POE switch (des-3010PA 8 port, there are other 30xx models with higher density), its price is very competitive and it has full snmp, cli etc management features. We power many hundreds of ZF7942s with them.

We’ve had mixed results here. Using a PoE enabled switch, such as the D-LINK DES 1316 works fine, but this only operates at 100mbps. However, using a DLINK P1012 power injector does NOT work, presumably because it’s going through to a gigabit switch(?) The P1012 is 802.3af compliant, but I’m guessing this still means I need to buy new injectors?

The problem is I’d really like to know what injectors will work. We’ve already spent a fortune upgrading the entire network to gigabit, so I’m not replacing the switches. An earlier post mentioned the PowerDsine 7000 series, but it’s extremely difficult to locate a reseller for these things (I’m guessing the 7012G would be the model I’d be looking for). Does anyone know if the 6012G model works with the ZF7942 APs, or alternatively any rack mounted injector that will work? As mentioned above I can’t go around replacing all the switches, and I’m not adding new ones just to support a few APs.

Thanks for any advice…

Strangely enough, we’ve had 100% success with the 24-port HP ProCurve 2610, and 0% success with the 24-port HP ProCurve 2520. Very strange. I wonder what would cause this? Both switches are 802.3af-compliant.

A good rule of thumb is to look at the two end points (Switch and AP). If both devices are Gigabit, then a 802.3af mid-span usually will not work. This is simply because Gigabit uses all 4 pairs for data, and most midspans just short the 4-5 and 7-8 pairs and send power over that. Naturally, shorting pairs along an ethernet cable will kill any connection, and this is why it usually fails.

The solution here is to stick to 10/100 if you are using midspans. Even if you are using a gigabit switch, force the switch and the AP to 100Mbit FD and you should be fine with any midspan. Gigabit and 802.3af mid-spans were never designed to cooperate.

We are aware of AP PoE problems with the HP ProCurve 2520 model
switches in particular (and only!), which appear to be on the edge
of acceptable 802.3af specification.

The 7942 is 802.3af class0 compliant and consumes 12Watts. This
standard nominally requires 48VDC, but generally operates with
36-60VDC at the AP connector.

The following PoE switches are compatible with ZF7942 and ZF2942

Linksys SRW2008MP (8 Ports)
Linksys SRW224P
NetGear FS726TP (24 Ports)
D-Link DES1228P (24 Ports)
TrendNet TPE-S88 (16 Ports)
HP procurve-24 2610
Nortel 470-24T-PWR (24 Ports)
3Com Model 3CDGS10PWR
Gig Trendnet 80WS

The following devices are tested with the 7942 and 7962

1.2.1.1
SMC GS8P – SMART 8P+1SFP
1.2.1.2
LinkSys 2008MP
1.2.1.3
BayStack 470
1.2.1.4
D-link DES-1228P
1.2.1.5
TrendNet TPE-S88
1.2.1.6
Linksys SRW 224P
1.2.1.6
Netgear FS726TP
1.2.2
Power with PoE Injector
1.2.2.1
SMCPWR-INJ3
1.2.2.2
Trendnet TPE-101I

Michael,

Saw your post re: problems with Procurve 2520 POE switches. We are powering 3 7962 APs with a Procurve 2520-8-POE switch. Have not seen any problems so far. What should be look for in terms of problems, or should we only be concerned if we max out the ports?

NetGear FSM7328PS (24+4 Ports) L3 POE Switch is also OK for 8 more ZF7942 connected at the same time on any 100Mbps POE ports.

For a mid-span Gigabit POE injector: Versa Technology VX-Pi1000Gb

http://www.versatek.com/products/poe-pi1000gb.htm or source from your Ruckus reseller.

I also have no problems powering 3 7962 APs with a HP 2520-8G-POE switch.