Re: Hubs/Switches
A autosensing hub has a built-in 2 port switch. Any 100Mbps ports are repeated together, as are the 10Mbps ports. The built in switch connects the 100Mb group to the 10Mb group. Which, by the way, creates an interesting problem when using a tool such as EtherPeek to record Ethernet packets. If EtherPeek is running on a CPU with a 10 MHz Ethernet connection, it will see all packets going between 10 MHz connections, but will *not* see any of the packets going from one 100 MHz to another 100 MHz connection because in effect these have been switched to a separate 100 MHz "segment". Very baffling until one figures out what is going on. I had assumed it would be a bridge type connection, not a switch. I'll bet both are out there. Thanks for the heads up. -- -- To subscribe:[EMAIL PROTECTED] To unsubscribe: [EMAIL PROTECTED] Archives:http://list.working-dogs.com/lists/retro-talk/ Problems?: [EMAIL PROTECTED]
Re: Hubs/switches
More clearing up... Jim's description on how an auto-sensing hub works was excellent. and here's some other thoughts. The data transfer between any two devices will only happen at the speed of the slowest device. So, a Mac talking to a switch at 100bps will talk to the switch at that speed, but if another Mac is only talking at 10bps, the two Macs will only talk to each other at 10bps. The faster one will have a lot of wait cycles. Now, there are two different technologies going into auto-sensing hubs though. That is, a 10/100 Hub. One, the backbone of the entire hub will communicate at the slowest speed (these are usually the very cheap 10/100 hubs), and the other that operates as two separate hubs joined together with a switch and therefore they will operate at the speed of the slowest device. If both devices are 100bps, then the speed is 100bps, depending on load of the hub.I would wager that over 90% of the autosensing hubs use this method. Some time ago there was a question on this list that concerned the use of a 10/100 switch or hub. There was a reply stating that a dual speed hub would only work at the speed of the slowest connected device. So a mix of 10 and 100 devices would cause all to run at only 10 mbps. At the time I was dubious of this and have since looked into the question and while there may indeed be some hubs with this limitation, a modern autosensing dual speed hub will allow each device to run at its max speed, just as a switch will do, although without the other advantages of a switch of course, but they are cheaper. Just thought I'd like to clear that up. -- -- To subscribe:[EMAIL PROTECTED] To unsubscribe: [EMAIL PROTECTED] Archives:http://list.working-dogs.com/lists/retro-talk/ Problems?: [EMAIL PROTECTED]
Hubs/switches
Some time ago there was a question on this list that concerned the use of a 10/100 switch or hub. There was a reply stating that a dual speed hub would only work at the speed of the slowest connected device. So a mix of 10 and 100 devices would cause all to run at only 10 mbps. At the time I was dubious of this and have since looked into the question and while there may indeed be some hubs with this limitation, a modern autosensing dual speed hub will allow each device to run at its max speed, just as a switch will do, although without the other advantages of a switch of course, but they are cheaper. Just thought I'd like to clear that up. -- Ken G i l l e t t _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ -- -- To subscribe:[EMAIL PROTECTED] To unsubscribe: [EMAIL PROTECTED] Archives:http://list.working-dogs.com/lists/retro-talk/ Problems?: [EMAIL PROTECTED]
Re: Hubs/switches
Thanx for your input. What exactleyt are you saying!? We used to had that problem and it turned out that Mac OS was the failing part. We bought a 24 port Intel 10/100 switch and Mac OS got all screwed when it came to AppleTalking. I eventually solved it by putting a "software beak" making 100 Mbit computers run at only 10 MBit. This problem does not occur when choosing switches from D-Link! So I bought a 24 port D-Link swich... (We're expanding and needed it anyway.) I haven't made any research wethere the "breaked computers" would work at 100 MBit now. We have bought loads of new computers lateley and the problem occured when mixing commputers running at only 10 MBit like our ISDN Quadra 900. :-) thanx, / jakob (I hope this post make sence...) At 09:41 2000-09-16 +0100, you wrote: Some time ago there was a question on this list that concerned the use of a 10/100 switch or hub. There was a reply stating that a dual speed hub would only work at the speed of the slowest connected device. So a mix of 10 and 100 devices would cause all to run at only 10 mbps. At the time I was dubious of this and have since looked into the question and while there may indeed be some hubs with this limitation, a modern autosensing dual speed hub will allow each device to run at its max speed, just as a switch will do, although without the other advantages of a switch of course, but they are cheaper. Just thought I'd like to clear that up. -- -- To subscribe:[EMAIL PROTECTED] To unsubscribe: [EMAIL PROTECTED] Archives:http://list.working-dogs.com/lists/retro-talk/ Problems?: [EMAIL PROTECTED]
Re: Hubs/switches
A autosensing hub has a built-in 2 port switch. Any 100Mbps ports are repeated together, as are the 10Mbps ports. The built in switch connects the 100Mb group to the 10Mb group. Jim jakob krabbe said, in a previous message: Thanx for your input. What exactleyt are you saying!? We used to had that problem and it turned out that Mac OS was the failing part. We bought a 24 port Intel 10/100 switch and Mac OS got all screwed when it came to AppleTalking. I eventually solved it by putting a "software beak" making 100 Mbit computers run at only 10 MBit. This problem does not occur when choosing switches from D-Link! So I bought a 24 port D-Link swich... (We're expanding and needed it anyway.) I haven't made any research wethere the "breaked computers" would work at 100 MBit now. We have bought loads of new computers lateley and the problem occured when mixing commputers running at only 10 MBit like our ISDN Quadra 900. :-) thanx, / jakob (I hope this post make sence...) At 09:41 2000-09-16 +0100, you wrote: Some time ago there was a question on this list that concerned the use of a 10/100 switch or hub. There was a reply stating that a dual speed hub would only work at the speed of the slowest connected device. So a mix of 10 and 100 devices would cause all to run at only 10 mbps. At the time I was dubious of this and have since looked into the question and while there may indeed be some hubs with this limitation, a modern autosensing dual speed hub will allow each device to run at its max speed, just as a switch will do, although without the other advantages of a switch of course, but they are cheaper. Just thought I'd like to clear that up. -- -- To subscribe:[EMAIL PROTECTED] To unsubscribe: [EMAIL PROTECTED] Archives:http://list.working-dogs.com/lists/retro-talk/ Problems?: [EMAIL PROTECTED] -- -- To subscribe:[EMAIL PROTECTED] To unsubscribe: [EMAIL PROTECTED] Archives:http://list.working-dogs.com/lists/retro-talk/ Problems?: [EMAIL PROTECTED]
Re: Hubs/Switches
Jim Grisham wrote: Subject: Re: Hubs/switches From: "Jim Grisham" [EMAIL PROTECTED] Date: Sat, 16 Sep 2000 10:55:38 -0500 (CDT) A autosensing hub has a built-in 2 port switch. Any 100Mbps ports are repeated together, as are the 10Mbps ports. The built in switch connects the 100Mb group to the 10Mb group. Jim Which, by the way, creates an interesting problem when using a tool such as EtherPeek to record Ethernet packets. If EtherPeek is running on a CPU with a 10 MHz Ethernet connection, it will see all packets going between 10 MHz connections, but will *not* see any of the packets going from one 100 MHz to another 100 MHz connection because in effect these have been switched to a separate 100 MHz "segment". Very baffling until one figures out what is going on. -- Garth Fletcher, President, JacqCAD International 288 Marcel Road, Mason, NH 03048-4704 (603) 878-4749 fax: (603) 878-0547 JacqCAD MASTER website: www.JacqCAD.com -- -- To subscribe:[EMAIL PROTECTED] To unsubscribe: [EMAIL PROTECTED] Archives:http://list.working-dogs.com/lists/retro-talk/ Problems?: [EMAIL PROTECTED]