Comware Based
Showing results for 
Search instead for 
Did you mean: 

nj2000 PoE issue

Occasional Contributor

nj2000 PoE issue


I have a strange issue with nj2000 Networkjacks.

These are my Devices:

1. several 3COM nj2000
2. several 3COM nj105
3. Switch stack - Alcatel Omniswitch 6850, 48Port PoE
4. ALLNET All8084, 8Port (4Port PoE)
5. 3COM 5500 48Port PoE


* PoE SW Version 00.0505.05
* Uboot Version:
* Power budget per unit: 230W

The destination is to connect more than one nj2000 to the same unit in
the stack and provide them with PoE.

Tests i made:

1. Connecting the first nj2000 to a unit in the stack, everything
works well. Connecting the second one to the same unit, it doesn't come
up (power budget ist remaining enough ).
2. Connecting several nj105 to the same unit in the stack, everything
works well, too.
3. Connecting an nj2000 to the ALLNET office switch, he doesn't come
up, but the ALLNETs PoE-Light is on.
4. nj105 <-> Allnet switch => everything works well.
5. several nj2000 <-> 5500er Switch works well, too.

So, all devices promise to support IEEE 802.3af, but there must be a
difference between the nj105 and nj2000.

How could I get rid of the problem?

If you need additional informations, i will post them.

Thanks in advance,