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31 messages in net.nether.puck.cisco-nsp[c-nsp] autonegotiating hub was: Def...| From | Sent On | Attachments |
|---|---|---|
| Clinton Work | Jan 14, 2005 5:25 pm | |
| jex...@harding.edu | Jan 14, 2005 5:36 pm | |
| Larry Smith | Jan 14, 2005 5:45 pm | |
| John Neiberger | Jan 14, 2005 5:53 pm | |
| Michael K. Smith | Jan 14, 2005 5:55 pm | |
| Niels Bakker | Jan 14, 2005 7:35 pm | |
| Anthony D Cennami | Jan 14, 2005 8:19 pm | |
| Greg Schwimer | Jan 14, 2005 9:16 pm | |
| Mikael Abrahamsson | Jan 15, 2005 3:03 am | |
| Ted Mittelstaedt | Jan 15, 2005 3:55 am | |
| Mikael Abrahamsson | Jan 15, 2005 4:05 am | |
| Chris Cappuccio | Jan 15, 2005 4:11 am | |
| Mikael Abrahamsson | Jan 15, 2005 4:16 am | |
| lee....@census.gov | Jan 15, 2005 7:23 am | |
| Mikael Abrahamsson | Jan 15, 2005 8:14 am | |
| Mike | Jan 15, 2005 9:25 am | |
| Church, Chuck | Jan 15, 2005 9:47 am | |
| Gert Doering | Jan 15, 2005 11:20 am | |
| Ted Mittelstaedt | Jan 15, 2005 11:31 am | |
| Gert Doering | Jan 15, 2005 11:57 am | |
| Michael K. Smith | Jan 15, 2005 4:25 pm | |
| Gert Doering | Jan 15, 2005 4:45 pm | |
| Michael K. Smith | Jan 15, 2005 4:48 pm | |
| Michael K. Smith | Jan 15, 2005 4:52 pm | |
| Mikael Abrahamsson | Jan 16, 2005 2:33 am | |
| Majid Farid | Jan 16, 2005 2:42 am | |
| Reuben Farrelly | Jan 16, 2005 5:35 am | |
| Mikael Abrahamsson | Jan 16, 2005 5:49 am | |
| Hudson Delbert J Contr 61 CS/SCBN | Jan 18, 2005 10:26 am | |
| Vincent De Keyzer | Jan 18, 2005 10:40 am | |
| Clinton Work | Jan 19, 2005 11:48 am |
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| Subject: | [c-nsp] autonegotiating hub was: Deferred packets on 2950 10/full interface | Actions... |
|---|---|---|
| From: | Michael K. Smith (mksm...@noanet.net) | |
| Date: | Jan 15, 2005 4:48:48 pm | |
| List: | net.nether.puck.cisco-nsp | |
On 1/15/05 5:14 AM, "Mikael Abrahamsson" <swm...@swm.pp.se> wrote:
On Sat, 15 Jan 2005 lee....@census.gov wrote:
Cheap combination of both - they act like there's an internal 2 port switch for switching traffic between the 10Mb hub ports and the 100Mb hub ports.
But the author referred to them as being "full duplex":
autonegotiating or not and often assumed autonegotiating hubs really wern't autonegotiating and would go to half duplex. Meanwhile the hub would assume the Tlan card was full duplex and setup for it.
For me a hub cannot be full duplex, whatever speed. A hub is by definition a half duplex device, even if it's dual speed.
Here is a pretty good resource for Clause 28 of Draft 4 of the IEEE 802.3u working group. http://www.scyld.com/NWay.html This covers 10/100 ethernet; 1000 Base is a separate group (802.3z?)
There is a Technology Ability Field bit that allows you to tell the other side what you support vis-?-vis speed and duplex. So, it is possible to have a hub that can have the appropriate bit set to tell the other side that it supports 100TX, but not have a bit set for supporting 100-Full Duplex.
I think the Auto-to-Hard Set showing up as half duplex is a result of the Parallel Detection part of the spec. Basically, it allows for pre-autonegotation devices to connect to a autonegotiation device, using a Link Monitor function to determine whether or not the devices can speak to one another. Bottom line, it would see 100 Meg capability, but no autonegotiation capabilities so it would have to assume Half Duplex.
Mike