KSZ8895MLUB Datasheet, PDF (27/120 Pages) Micrel Semiconductor – Integrated 5-Port 10/100 Managed Switch

Micrel, Inc.
KSZ8895MLUB
Crossover Cable
A crossover cable connects an MDI device to another MDI device, or an MDI-X device to another MDI-X device. Figure 2
shows a typical crossover cable connection between two switches or hubs (two MDI-X devices).
Figure 2. Typical Crossover Cable Connection
Auto-Negotiation
The KSZ8895MLUB 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 highest common mode of operation. Link partners
advertise their capabilities to each other, and then compare their own capabilities with those they received from their link
partners. The highest speed and duplex setting that is common to the two link partners is selected as the mode of
operation.
The following list shows the speed and duplex operation mode from highest to lowest.
• Highest: 100Base-TX, full-duplex
• High:
100Base-TX, half-duplex
• Low:
10Base-T, full-duplex
• Lowest: 10Base-T, half-duplex
If auto-negotiation is not supported or the KSZ8895MLUB link partner is forced to bypass auto-negotiation, the
KSZ8895MLUB sets its operating mode by observing the signal at its receiver. This is known as parallel detection, and
allows the KSZ8895MLUB to establish link by listening for a fixed signal protocol in the absence of auto-negotiation
advertisement protocol. The auto-negotiation link-up process is shown in Figure 3.
April 1, 2014
27
Revision 2.1