Wireless Service Providers → DCMA-82

Hello

Is anyone using these with rb411?

They used to have problems but I was hopeing they may be ok now.

Looking for a replacement for r52h's that seem to be failing often.

Thanks

I tried one yesterday with a RB411 and RB411AH.. same problems..

-Gerard

Equis:

This card works in many, many types of hardware. It does have a high in-rush current though so it needs a pretty good power supply. This could be a simple design change and perhaps you can ask MT to do this?

-Hal

411s tend to have issues when being powered with 12v. Even though they say it handles fine at that voltage, any high powered wireless card will usually cause it to act strange at 12v. (Random lockups and reboots being key symptoms)

Safe voltage I've found is nothing less than 18v, but 24v is probably the best bet as it can be done with 12/6V battery banks and is more common in PoE devices. (Depending on your applications of course)

The RB411 has a problem with the DCMA-82/WMR-400 that causes them to reboot as soon as the wireless card is enabled.

The RB411's internal power supply cannot supply enough current to handle the load from the DCMA-82. It happens regardless of what the input voltage is.

-Gerard

My experience is mostly on the XR side of things (Tried a couple other odd cards here and there) but the input voltage is definitly a problem with the XR units. I guess the DCMA-82 are a bit different, but with the XR the input voltage is a fix for the reboots and such.

Does anyone know if the rb 433 has teh same fate?

Thanks

I'll try it in the morning..

-Gerard

DCMA-82 causes RB433 and RB433AH to reboot after the card is enabled..

-Gerard

I just tested one of the 433AH and a DCMA-82 and it seems to be running just fine, I haven't had a reboot yet after enabling it, RouterOS 3.11 and firmware 2.16.

It may be a different board revision, I guess I will try a few more cards and boards I have laying around

EDIT: I am running a 24v 3amp power supply and it seems to do just fine on the 433AH with 3x DMCA-82 with u.fl connectors not really associated to anything just enabled and broadcasting.

I tried two different RB433AH's and 3 different DCMA-82's today..

I only tried one card at a time. If one worked I would have tested more cards at a time.

As soon as I enabled the card it would reboot for me.. I was trying station mode though..

I tested with a Pac Wireless POE-24i and a Mikrotik 18POW (24volt version) plugged into the power jack.

The routerboards I tried were from our Mikrotik shipment we received on Monday. DCMA-82's were purchased about a month ago as WMR-400's with MMCX connectors..

-Gerard

Well that might be it I had it through the power jack since it was on an open bench and I had them out of the package for upgrades before being deployed, then some pigtails I was running in 5ghz as well.

If that's the case then I suppose it would be an over zealot power protection scheme that is tripped by too much wattage not just voltage. At least that's what I would think. Either that or I got a magic batch, tried 2 433AHs and one 433 and they all powered up and worked just fine by what I could tell. These are a few months old (2 maybe) 433 and 433AH I tested them on same with the DMCA-82 though they are for a 600 board.

I have a RB433 V3.10 with 1 DCMA-82(3 associations) and 1 SR2(15 associations) up for 54d 12h.
It is on about 240' of cat5. Running on a 24V 3A industrial power supply.
You guys have me worried to ever reboot.

Todd

I'll have to try some more tomorrow in AP mode and see what happens.

-Gerard

Higher inrush and/or peak current is the root problem as Hal and Gerard have hinted.

Voltage-wise, even a 5V system could run XR or DCMA-82 without any problem - as long as it is designed to supply robust 3.3V/2A to the miniPCI slot. In fact, on any well designed system, the miniPCI voltage should not change much even if the input voltage changes from 5V to 50V.

I just tried it again on a 433 through POE same power supply and it hasn't even batted an eye, I don't have a setup I am willing to test long periods of time since it is just on a desk. I think it is just that initial on rush of power that may be overwhelming lesser power supplies, actually wouldn't mind seeing the amperage draw when it turns on the radios.

I just tried a DCMA-82 on a 433 with POE 18V supply on a very short cat-5 on a test bench. No problems. I unplugged - replugged a few times.

I tried it both as AP-bridge and station. I tried it with the card enabled at boot and also disabled at boot, then enabled after boot. All work ok.

I have another RB433 with a DCMA-82, an XR-5, and an 8602+S, POE 24V. So far it's running well.

Possibly some combos work and others don't. I hope more people will try this.

That's what I would have thought too in theory. You would assume that the port would give the proper needed power if it's much lower than the feed source, and wouldn't fluctuate much. But it's even been acknowledged by MT (God knows where now, on their forums or an email somewhere) that the boards don't seem to handle properly when at 12V and a heavy duty card in them.

I don't have any ways to really bench the voltages on the ports and what happens when cards are changed or used heavily etc. But it's pretty much the same all the time when used with XR2 and 12V the board won't be stable (With anything higher than a 20foot Ethernet PoE run), crank up the voltage to 18 or 24 and the problem vanishes. I kinda wish myself I knew what was the deal, because it's something MT is rather quiet at admitting unless you corner someone about it.

Anyone possibly know what's the deal with it? Perhaps it's only on a certain revision of the 411s?

hello,
I always use dcma82 for may wireless link. And I also sell hundreds of them.

For the dcma82 bug ini RB 411/411A, I always use some trick to overcome it. I only use bios firmware 2.15 if I want to use dcma82 and it works flawlessly .

For RB 433 it should work just fine if you use bios firmware 2.16 ( I already tested it ).

I hope my trick could resolve your problem.

thanks