KSZ8893-MQL Micrel Semiconductor, Inc., KSZ8893-MQL Datasheet - Page 25

• Manufacturer Part Number: KSZ8893-MQL
• Description: Integrated 3-Port 10/100 Managed Switch with PHYs
• Manufacturer: Micrel Semiconductor, Inc.

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).
Auto-Negotiation
The KSZ8893MQL conforms to the auto-negotiation protocol, defined in Clause 28 of the IEEE 802.3u
specification.
Auto-negotiation allows unshielded twisted pair (UTP) link partners to select the best common mode of operation.
In auto-negotiation, link partners advertise their capabilities across the link to each other. If auto-negotiation is not
supported or the KSZ8893MQL link partner is forced to bypass auto-negotiation, the KSZ8893MQL sets its
operating mode by observing the signal at its receiver. This is known as parallel detection, and allows the
KSZ8893MQL to establish link by listening for a fixed signal protocol in the absence of auto-negotiation
advertisement protocol.
The link up process is shown in the following flow diagram.
Micrel
November 2005
Media Dependent Interface
Modular Connector (RJ-45)
Transmit Pair
Receive Pair
(Repeater or Switch)
10/100 Ethernet
HUB
Figure 2. Typical Crossover Cable Connection
1
2
3
4
5
6
7
8
Crossover
Cable
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Media Dependent Interface
Modular Connector (RJ-45)
(Repeater or Switch)
1
2
3
4
5
6
7
8
10/100 Ethernet
Transmit Pair
HUB
Receive Pair
KSZ8893MQL/MQLI
M9999-111705