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Broadcom cards continually re-negotiating, showing short?
I have a network with 13 HP DC5750 desktops. Almost all of them are
exhibiting a strange behaviour. They drop the network connection for a few seconds, and then reconnect. In the event log, I see this event repeatedly: 'Broadcom NetXtreme Gigabit Ethernet: Network controller configured for 100Mb full-duplex link' On some machines, it does not happen too often, once every week or so. But on some, it is happening once an hour, and even once every few minutes sometimes. Also, when I run the Broadcom Diags, and run cable test, it shows that 2 of the 4 pairs have a short. At first, I thought, AHA!, that's the problem. But now it seems suspicious, because all my computers are showing 2 shorted pairs. While it is possible, I doubt that they are all shorted. Has anyone else seen this happen? I'm going to try new cables to make sure, but beyond that, this seems pretty weird to me. Maybe it's the cheapo Linksys switch they are plugged into? Or maybe there are Gremlins chewing on my cables at night? Many of the events are registering after midnight.... |
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#2
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Broadcom cards continually re-negotiating, showing short?
On Jul 25, 5:50*pm, Mike wrote:
I have a network with 13 HP DC5750 desktops. Almost all of them are exhibiting a strange behaviour. They drop the network connection for a few seconds, and then reconnect. In the event log, I see this event repeatedly: 'Broadcom NetXtreme Gigabit Ethernet: Network controller configured for 100Mb full-duplex link' On some machines, it does not happen too often, once every week or so. But on some, it is happening once an hour, and even once every few minutes sometimes. Also, when I run the Broadcom Diags, and run cable test, it shows that 2 of the 4 pairs have a short. At first, I thought, AHA!, that's the problem. But now it seems suspicious, because all my computers are showing 2 shorted pairs. While it is possible, I doubt that they are all shorted. Has anyone else seen this happen? I'm going to try new cables to make sure, but beyond that, this seems pretty weird to me. Maybe it's the cheapo Linksys switch they are plugged into? Or maybe there are Gremlins chewing on my cables at night? Many of the events are registering after midnight.... Have you considered checking for updated drivers? Also, are these cables passed through walls / ceilings ? |
#3
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Broadcom cards continually re-negotiating, showing short?
On Jul 25, 5:50*pm, Mike wrote:
I have a network with 13 HP DC5750 desktops. Almost all of them are exhibiting a strange behaviour. They drop the network connection for a few seconds, and then reconnect. In the event log, I see this event repeatedly: 'Broadcom NetXtreme Gigabit Ethernet: Network controller configured for 100Mb full-duplex link' On some machines, it does not happen too often, once every week or so. But on some, it is happening once an hour, and even once every few minutes sometimes. Also, when I run the Broadcom Diags, and run cable test, it shows that 2 of the 4 pairs have a short. At first, I thought, AHA!, that's the problem. But now it seems suspicious, because all my computers are showing 2 shorted pairs. While it is possible, I doubt that they are all shorted. Has anyone else seen this happen? I'm going to try new cables to make sure, but beyond that, this seems pretty weird to me. Maybe it's the cheapo Linksys switch they are plugged into? Or maybe there are Gremlins chewing on my cables at night? Many of the events are registering after midnight.... Have you considered checking for updated drivers? Also, are these cables passed through walls / ceilings ? |
#4
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Broadcom cards continually re-negotiating, showing short?
On Jul 27, 9:36*am, smlunatick wrote:
On Jul 25, 5:50*pm, Mike wrote: I have a network with 13 HP DC5750 desktops. Almost all of them are exhibiting a strange behaviour. They drop the network connection for a few seconds, and then reconnect. In the event log, I see this event repeatedly: 'Broadcom NetXtreme Gigabit Ethernet: Network controller configured for 100Mb full-duplex link' On some machines, it does not happen too often, once every week or so. But on some, it is happening once an hour, and even once every few minutes sometimes. Also, when I run the Broadcom Diags, and run cable test, it shows that 2 of the 4 pairs have a short. At first, I thought, AHA!, that's the problem. But now it seems suspicious, because all my computers are showing 2 shorted pairs. While it is possible, I doubt that they are all shorted. Has anyone else seen this happen? I'm going to try new cables to make sure, but beyond that, this seems pretty weird to me. Maybe it's the cheapo Linksys switch they are plugged into? Or maybe there are Gremlins chewing on my cables at night? Many of the events are registering after midnight.... Have you considered checking for updated drivers? Also, are these cables passed through walls / ceilings ?- Hide quoted text - - Show quoted text - Yep, the NIC drivers (as well as bios and all other drivers on the systems) are up to date. I went on-site on Sunday to work on this problem, and I found that the systems going into Standby every night seems to be related. I disabled Standby on all the systems, rebooted them, and now NONE of them are having any issue. I'm hoping there is a way to still use Standby but not cause NIC issues. |
#5
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Broadcom cards continually re-negotiating, showing short?
On Jul 27, 9:36*am, smlunatick wrote:
On Jul 25, 5:50*pm, Mike wrote: I have a network with 13 HP DC5750 desktops. Almost all of them are exhibiting a strange behaviour. They drop the network connection for a few seconds, and then reconnect. In the event log, I see this event repeatedly: 'Broadcom NetXtreme Gigabit Ethernet: Network controller configured for 100Mb full-duplex link' On some machines, it does not happen too often, once every week or so. But on some, it is happening once an hour, and even once every few minutes sometimes. Also, when I run the Broadcom Diags, and run cable test, it shows that 2 of the 4 pairs have a short. At first, I thought, AHA!, that's the problem. But now it seems suspicious, because all my computers are showing 2 shorted pairs. While it is possible, I doubt that they are all shorted. Has anyone else seen this happen? I'm going to try new cables to make sure, but beyond that, this seems pretty weird to me. Maybe it's the cheapo Linksys switch they are plugged into? Or maybe there are Gremlins chewing on my cables at night? Many of the events are registering after midnight.... Have you considered checking for updated drivers? Also, are these cables passed through walls / ceilings ?- Hide quoted text - - Show quoted text - Yep, the NIC drivers (as well as bios and all other drivers on the systems) are up to date. I went on-site on Sunday to work on this problem, and I found that the systems going into Standby every night seems to be related. I disabled Standby on all the systems, rebooted them, and now NONE of them are having any issue. I'm hoping there is a way to still use Standby but not cause NIC issues. |
#6
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Broadcom cards continually re-negotiating, showing short?
"Mike" wrote: I have a network with 13 HP DC5750 desktops. Almost all of them are exhibiting a strange behaviour. They drop the network connection for a few seconds, and then reconnect. In the event log, I see this event repeatedly: Has anyone else seen this happen? Yes. On every computer with these LAN chips. Plus a few other makes. http://mylogon.net/support/psave |
#7
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Broadcom cards continually re-negotiating, showing short?
"Mike" wrote: I have a network with 13 HP DC5750 desktops. Almost all of them are exhibiting a strange behaviour. They drop the network connection for a few seconds, and then reconnect. In the event log, I see this event repeatedly: Has anyone else seen this happen? Yes. On every computer with these LAN chips. Plus a few other makes. http://mylogon.net/support/psave |
#8
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Broadcom cards continually re-negotiating, showing short?
"Mike" wrote:
Also, when I run the Broadcom Diags, and run cable test, it shows that 2 of the 4 pairs have a short. At first, I thought, AHA!, that's the problem. But now it seems suspicious, because all my computers are showing 2 shorted pairs. While it is possible, I doubt that they are all shorted. 10/100 Ethernet uses the red and green pairs only, and a signal transformer is connected across each pair. Thus a healthy connection shows: No connection (infinite resistance) between any two pairs. Low resistance across the two wires of the red or green pair. No connection between the wires of blue or brown pairs. On 1000MHz cables, all four pairs are used. A common mistake in Ethernet wiring is to use a nonstandard wiring-order such that transmit and receive signals are split across pairs. When you understand that the twisted pairs are there to segregate the signals, it will be obvious that this will give rise to all sorts of intermittent troubles through crosstalk. Thus, unlike most other electrical installs, you MUST follow the official wiring scheme or it won't work. Just thought I'd mention this as it's another frequent cause of LAN troubles. Looking at the side of the plug without the clip: White/Orange Orange/White White/Green Blue/White White/Blue Green/White White/Brown Brown/While -and yeah this may look totally wacko but it's right! |
#9
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Broadcom cards continually re-negotiating, showing short?
"Mike" wrote:
Also, when I run the Broadcom Diags, and run cable test, it shows that 2 of the 4 pairs have a short. At first, I thought, AHA!, that's the problem. But now it seems suspicious, because all my computers are showing 2 shorted pairs. While it is possible, I doubt that they are all shorted. 10/100 Ethernet uses the red and green pairs only, and a signal transformer is connected across each pair. Thus a healthy connection shows: No connection (infinite resistance) between any two pairs. Low resistance across the two wires of the red or green pair. No connection between the wires of blue or brown pairs. On 1000MHz cables, all four pairs are used. A common mistake in Ethernet wiring is to use a nonstandard wiring-order such that transmit and receive signals are split across pairs. When you understand that the twisted pairs are there to segregate the signals, it will be obvious that this will give rise to all sorts of intermittent troubles through crosstalk. Thus, unlike most other electrical installs, you MUST follow the official wiring scheme or it won't work. Just thought I'd mention this as it's another frequent cause of LAN troubles. Looking at the side of the plug without the clip: White/Orange Orange/White White/Green Blue/White White/Blue Green/White White/Brown Brown/While -and yeah this may look totally wacko but it's right! |
#10
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Broadcom cards continually re-negotiating, showing short?
On Jul 28, 8:54*am, Anteaus wrote:
"Mike" wrote: *Also, when I run the Broadcom Diags, and run cable test, it shows that 2 of the 4 pairs have a short. At first, I thought, AHA!, that's the problem. But now it seems suspicious, because all my computers are showing 2 shorted pairs. While it is possible, I doubt that they are all shorted. 10/100 Ethernet uses the red and green pairs only, and a signal transformer is connected across each pair. Thus a healthy connection shows: No connection (infinite resistance) between any two pairs. Low resistance across the two wires of the red or green pair. No connection between the wires of blue or brown pairs. On 1000MHz cables, all four pairs are used. A common mistake in Ethernet wiring is to use a nonstandard wiring-order such that transmit and receive signals are split across pairs. When you understand that the twisted pairs are there to segregate the signals, it will be obvious that *this will give rise to all sorts of intermittent troubles through crosstalk. Thus, unlike most other electrical installs, you MUST follow the official wiring scheme or it won't work. * Just thought I'd mention this as it's another frequent cause of LAN troubles. Looking at the side of the plug without the clip: White/Orange Orange/White White/Green Blue/White White/Blue Green/White White/Brown Brown/While -and yeah this may look totally wacko but it's right! Oh yes, trust me the cable pairs are in the correct color order. I made that mistake a long time ago and had to re-do a lot of cables so I always check that. After that happened, I've been known to recite the color order in my sleep! |
#11
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Broadcom cards continually re-negotiating, showing short?
On Jul 28, 8:54*am, Anteaus wrote:
"Mike" wrote: *Also, when I run the Broadcom Diags, and run cable test, it shows that 2 of the 4 pairs have a short. At first, I thought, AHA!, that's the problem. But now it seems suspicious, because all my computers are showing 2 shorted pairs. While it is possible, I doubt that they are all shorted. 10/100 Ethernet uses the red and green pairs only, and a signal transformer is connected across each pair. Thus a healthy connection shows: No connection (infinite resistance) between any two pairs. Low resistance across the two wires of the red or green pair. No connection between the wires of blue or brown pairs. On 1000MHz cables, all four pairs are used. A common mistake in Ethernet wiring is to use a nonstandard wiring-order such that transmit and receive signals are split across pairs. When you understand that the twisted pairs are there to segregate the signals, it will be obvious that *this will give rise to all sorts of intermittent troubles through crosstalk. Thus, unlike most other electrical installs, you MUST follow the official wiring scheme or it won't work. * Just thought I'd mention this as it's another frequent cause of LAN troubles. Looking at the side of the plug without the clip: White/Orange Orange/White White/Green Blue/White White/Blue Green/White White/Brown Brown/While -and yeah this may look totally wacko but it's right! Oh yes, trust me the cable pairs are in the correct color order. I made that mistake a long time ago and had to re-do a lot of cables so I always check that. After that happened, I've been known to recite the color order in my sleep! |
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