Auto-negotiation and Speed-sensing. Black Box LBH184A, LBH181A, LBH081A, LBH082A, LBH084A, LBH182A

Chapter 4: Operation

4.2 Auto-negotiation and Speed-sensing

All eight RJ-45 ports independently support auto-negotiation for speed in

10BASE-T and 100BASE-TX modes. Operation is according to the IEEE 802.3u standard.

When a RJ-45 cable connection is made, and each time a LINK is enabled, auto-negotiation takes place. The LBH08x/LBH18x advertises its capability for 10 or

100 Mbps speed, and the device at the other end of the cable should similarly advertise / respond and both sides will agree to the speed being used. Depending upon the device connected, this will result in agreement to operate at either 10 Mbps or 100Mbps speed.

When the ‘LINK/ACT’ LED is ON, steady ON indicates LINK with no traffic, blinking ON indicates the port is transmitting / receiving. The port has auto-negotiated for operation. (If a LBH08x or LBH18x RJ-45 port is connected to a non-negotiating device, it will default to 10 Mbps speed and half-duplex mode, per the IEEE 802.3u standard).

4.3 Auto-Cross (MDIX) and Auto-negotiation, for RJ-45 ports

The RJ-45 ports independently support auto-cross (MDI or MDIX) in auto-negotiation mode and will work properly with all the other connected devices with RJ-45 ports whether they support auto-negotiation (e.g., 10Mbps hub, media converter) or fixed mode at 10Mbps or 100Mbps Half/Full Duplex (managed switch) or not. No cross-over cable is required while using the LBH08x/LBH18x copper port to other devices. Operation is according to the IEEE 802.3u standard.

F/H:

(when LINK is made) indicates port is transmitting and receiving.

ON = Full-Duplex and Link,

OFF = Half-Duplex and / or no Link

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