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Old 05-24-2013, 03:06 AM   #1
Ryu.Hayabusa
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Default Juniper SSG5 Dead Ethernet Ports

Picked up 2 SSG5's with dead ethernet ports and not really sure where to start to try and locate the problem. When turned on one has 2 ports that the activity light blinks once every so often, and the other has 1 port that does the same, which were taped over by the previous owner, so I assume they are not working. Not all of the ports on these are dead, I tried the ones without tape, 3 work on one and 4 on the other, both mostly on the right side, both have dead wan ports.

Looked at the caps, none of which appear to be bulging (will test tomorrow with multimeter), tested some surface mount resistors and caps near the ports but everything appeared to be normal.

I'll try to get some internal pictures uploaded tomorrow.

Any ideas or guidance would be greatly appreciated.
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Old 05-24-2013, 06:48 AM   #2
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Default Re: Juniper SSG5 Dead Ethernet Ports

Interesting. While Juniper is a pretty reputable brand, of the 3 devices we have, all 3 have been replaced once, including the SSG5, so from my sample set, 100% failure rate.

I'll keep an eye on this thread, I may still have the old SSG5 I'll have to look for it.
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Old 05-24-2013, 09:10 AM   #3
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Default Re: Juniper SSG5 Dead Ethernet Ports

Aw shit, the datacenter I have all of my servers in just bought new Juniper stuff... Should I move elsewhere? lol
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Old 05-24-2013, 10:06 AM   #4
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Default Re: Juniper SSG5 Dead Ethernet Ports

Quote:
Originally Posted by shovenose View Post
Aw shit, the datacenter I have all of my servers in just bought new Juniper stuff... Should I move elsewhere? lol
The replacements for 2 units that failed first (one lasted 20 seconds, the other a week) have been running fine for several years, so I'd say you're ok.
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Old 05-24-2013, 10:43 PM   #5
Ryu.Hayabusa
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Default Re: Juniper SSG5 Dead Ethernet Ports

Well I think I'm making a bit of progress lol. This board is really confusing since everything is testing good, until I tried components after the magnetics for the interfaces. Some resistors are testing way low, I'll have to remove them to verify that. Before the magnetics I'm getting 2.56v, which I'm not sure is what is expected or not.

I also found this which was interesting: http://download.routerboard.pl/RB750G.pdf

Testing the tx/rx termination resistance revealed that most are way off except for one which was 150ohms exactly. It says in that guide to replace the physical connectors but that doesn't seem like it would make a difference unless the termination resistors were inside the shielding, which it appears (to me) on the juniper that they are not.

Thoughts?
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Old 05-25-2013, 09:41 PM   #6
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Default Re: Juniper SSG5 Dead Ethernet Ports

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Originally Posted by smason View Post
While Juniper is a pretty reputable brand,
Juniper, like other big companies, has bought out other companies and simply rebranded the products under the Juniper name.
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