KSZ8795CLX
3.1.7.2
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).
FIGURE 3-2:
TYPICAL CROSSOVER CABLE CONNECTION
10/100 ETHERNET
MEDIA DEPENDENT INTERFACE
10/100 ETHERNET
MEDIA DEPENDENT INTERFACE
1
1
CROSSOVER
CABLE
RECEIVE PAIR
2
RECEIVE PAIR
2
3
3
4
4
TRANSMIT PAIR
5
TRANSMIT PAIR
5
6
7
8
6
7
8
MODULAR CONNECTOR (RJ-45)
HUB
MODULAR CONNECTOR (RJ-45)
HUB
(REPEATER OR SWITCH)
(REPEATER OR SWITCH)
3.1.8
AUTO-NEGOTIATION
The KSZ8795CLX 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 adver-
tise their capabilities to each other and then compare their own capabilities with those they received from their link part-
ners. The highest speed and duplex setting that is common to the two link partners is selected as the mode-of-operation.
Auto-negotiation is supported for the copper ports only.
The following list shows the speed and duplex operation mode (highest to lowest):
• 100BASE-TX, full-duplex
• 100BASE-TX, half-duplex
• 10BASE-T, full-duplex
• 10BASE-T, half-duplex
If auto-negotiation is not supported or the KSZ8795CLX link partner is forced to bypass auto-negotiation, the KSZ8795-
CLX sets its operating mode by observing the signal at its receiver. This is known as parallel detection, and allows the
KSZ8795CLX 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 3-3.
2016 Microchip Technology Inc.
DS00002112A-page 15
MICREL [ MICREL SEMICONDUCTOR ]
