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KS8993M Datasheet(PDF) 24 Page - Micrel Semiconductor |
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KS8993M Datasheet(HTML) 24 Page - Micrel Semiconductor |
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24 / 85 page 
Micrel, Inc. KS8993M/ML/MI April 2005 24 M9999-041205 Crossover Cable A crossover cable connects an MDI device to another MDI device, or an MDI-X device to another MDI-X device. The following diagram shows a typical crossover cable connection between two switches or hubs (two MDI-X devices). Receive Pair Receive Pair Transmit Pair 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Transmit Pair 10/100 Ethernet Media Dependent Interface 10/100 Ethernet Media Dependent Interface Modular Connector (RJ-45) HUB (Repeater or Switch) Modular Connector (RJ-45) HUB (Repeater or Switch) Crossover Cable Figure 2. Typical Crossover Cable Connection Auto Negotiation The KS8993M conforms to the auto negotiation protocol as described by the 802.3 committee. Auto negotiation allows unshielded twisted pair (UTP) link partners to select the best common mode of operation. In auto negotiation, the link partners advertise capabilities across the link to each other. If auto negotiation is not supported or the link partner to the KS8993M is forced to bypass auto negotiation, then the mode is set by observing the signal at the receiver. This is known as parallel mode because while the transmitter is sending auto negotiation advertisements, the receiver is listening for advertisements or a fixed signal protocol. The link setup is shown in the following flow diagram. |
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