Re: Omniswitch 6800-48 No Boot
Posted: 09 Mar 2012 13:19
As far as I know there are no reset jumpers in 6800, 6600 model was assembled with jumper to break boot sequence.
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The pinout in the hardware guide is correct. For a serial cable, you need only 3 signals - send, receive, signal ground, and ready, which is itself shorted to ground in the absence of flow control (ie, "always ready"). There is no +/- because the signal is not balanced.In the hardware user guide, the pinout is very strange. It says:
1 NC
2 NC
3 RXD
4 GND
5 GND
6 TXD
7 NC
8 NC
But for terminal connection you need more than just rxd und txd. even if they mean 3-->RXD+ 4-->RXD-,... this woult be strange, wouldn´t it?
Yes, that is right.But they [RJ45 pins] ar number this way, if i get it wright now:
8 6 4 2
7 5 3 1
Agreed...any kind of schematic, hint as to what might be wrong, or direction to begin troubleshooting would be very welcome. I tried opening the switch and there were a great many jumpers all over the place. My guess is that a capacitor somewhere needs to be replaced, or maybe solder reflowed or perhaps a flash chip replaced. With other switches, the main unfixable problem is switch fabric deterioration, which usually causes several ports to go bad well before the switch blows up.Are there some ideas, what i can try to get the Switches back to live? I cant imagine, that all 3 Switches wont work at all. Even no console output. There mut be sth wrong. Please help!
I have been trying different solutions to no avail for DAYS, 1) i got to have fun making a cable again. 2) it worked! thank you friendaruijtenberg wrote: ↑19 Jan 2017 14:45 You can use a Cisco DB9 to RJ45 console cable with a RJ45 coupler and these pinouts. (see attachment)
Hello everybodyone6f wrote: ↑07 Mar 2012 07:23 Somewhere is wrong.
DB9->color->RJ45
1 NU -
2 brown/white 6
3 orange 3
4 blue/white 2
5 green 4
6 blue 7
7 orange/white 1
8 brown 8
9 NU -
If you have a cisco adapter compare with:So if you have a Cisco adapter try simply to change 3-6, 2-7, 1-8Code: Select all
DB-9 | RJ-45 Cisco | RJ-45 Alcatel _____________________________________________ 1 0 0 2 3 6 3 6 3 4 7 2 5 4 4 6 2 7 7 8 1 8 1 8 9 0 0
May be try other baud rates, since 9600 is default, but could been modified earlier.