Latest threads in Ethernet LANshow only best voted threads
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Shortest ethernet frame time = 5.76uS?
Could someone check my calculations? I'm looking for the shortest time an Ethernet frame will occupy the wire. I make it about 5uS on 100Mbit as follows. Minimum frame size in bytes is 46 payload + 14...
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15 years ago
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RMII MII Help Please
Note: I also posted this to c.a.embedded. I'm not sure it belongs here, but no answers there so far... In putting together a little control nodule w/ a single 10/100 ethernet port, I started wondering...
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15 years ago
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Sharing a switch port
we have 20 new PCs being setup in a conference room. We have only 5 jacks in the room wired to our ethernet switch in the wiring closet. The powers that be want to just buy a 24 port switch, plug the...
6
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15 years ago
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Theory behind 31.25 MHz in 100BASE-TX?
Hi there, 100BASE-TX is said by a number of authors to have its fundamental frequency at 31.25 MHz, but the proofs given (if any) seem vague or questionable at best. E.g., I think I met a proof going...
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15 years ago
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layer-2 tracking
Not with unmanaged switches. With managed switches you would examine the forwarding tables on the switches looking to see out which port traffic for that laptops MAC address goes. Any MAC address on a...
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15 years ago
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illicit connection
Hi all, I have read the following in a book traditional Ethernet co-axial cables (10Base 2) can be tapped without cutting through it, but you need special tools and transceiver to make the illicit...
5
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15 years ago
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Efficiency of link aggregation
Is anyone aware of any studies on the efficiency of 802.3ad link aggregation. Since a hash is used to determine which member of an aggregate to put packets on in order to maintain ordering within a...
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15 years ago
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Help with debugging 10/100/1000Base-T PHY problem
Hi all, I have a design with a tri-speed Base-T PHY, which exhibits some weird behaviour. For some reason sometimes the PHY doesn't establish the link with another PHY (typically in a PC) after the...
3
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15 years ago
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Best book covering Ethernet PHY
Hello, Could someone please recommend a good book covering 10/100/1000Base-T PHY level? Alternatively, which parts of the IEEE802.3 are required to understand operation of the above in detail? Thanks,...
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15 years ago
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10Gb Ethernet on Intel Mac, Myricom 10Gb Eth vs. Cisco Catalyst 3560E X2 CX4/MMF
Dear Everyone, I'd appreciate any practical notes/recommendation/warnings on the following combination of hardware (and operating system drivers): We're eyeing some 10Gb Eth adapter cards to be used...
2
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15 years ago
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How to open the hood on this D-Link Ethernet switch?
Dear everyone, apologies for a question that's more hardware-related than networking related... I have a D-Link DGS-1216T Ethernet switch, in a 19"/1U chassis - and I'd like to remove the lid off that...
3
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15 years ago
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VLAN Filtering
Hello I've a web link for u here in this page this line is mentioned Each port is assigned obviously only 1 VLAN ID as it PVID as otherwise it would be impossible to decide to which VLAN to associate...
6
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15 years ago
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Questions regarding the AUI concepts
Hello! In the book by Charles Spurgeon on Ethernet, described here. mentions on page 104 the basics behind the AUI connector. And then on page 105 there is a blurb there describing the Control Out...
3
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15 years ago
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RSTP - Changing Forward Delay
My RSTP is working with accordance to 802.1w-2001 Did the changing of the Forward Delay can lead to some traffic hit in network ? When the Forward Delay changed - am I need to "reselect" all ports ?
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15 years ago
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Multicast VLAN Id
Hello If i set the default vlan id of a l2 switch to 1 then is it possible that i set the Multicast VLAn ID of the same switch to some another value foe exp -- 4 or 5 or any vlan except 1. Thanks...
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15 years ago
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