Black Box Modular Switches, LE14XXA manual For RJ-45

ack Box Modular Switches	Installation and User Guide (8/99)
xed, even if the attached device may or may not	support full-duplex. This is desirable when

ere are unknown devices presently or potentially connected, which will not operate correctly ith full-duplex. Examples include hubs which support only half-duplex by default.

Therefore, the default setting of full-duplex (fiber ports) is generally desirable because is widely used and allows for the connection of various devices without re- nfiguration(specially along with switches). Under certain conditions,(where the connected vice is half duplex and does not support full-duplex; or the connected device does not support ll-duplex properly) no full-duplex is better and the internal jumper settings will permit this to selected on a per-port basis.

6Combo(3+1) ports, internal jumper settings for 10/100 RJ -45 Auto-Negotiation or 10 or 100Mb or for fixed Half- or Full-Duplex 100Mb, per port

The factory (default) setting is Auto-Negotiation on all RJ-45 ports and full-duplex on fiber 10 Mbps or 100Mbps ports, which is generally

Jumper Settings for 10/100Mbps RJ-45 Auto-Negotiation,10 or 100Mbps RJ-45 & Fiber Half or Full Duplex

	Jumper	Port		Function	Factory Settings		Speed
	JP2 -3, 6-7, 10-11	Pin 2-3, 6-7, 10-11	Auto-Negotiation		YES		10/100 Mb
	JP1-2, 6-7, 9-10	Pin 1-2, 6-7, 9-10	FDX @100 config		YES		10 Mb or 100 Mb
	JP1-2, 7-8, 11-12	Pin 1-2, 7-8, 11-12	HDX@100 config		NO		10Mb or 100 Mb
		10/100 Mbps		10 or100Mbps	Full	10 or100Mbps Half
Factory Settings		Auto Negotiation		Duplex		J1	Duplex
		J1		J1

J1

For RJ-45 ports only						10/100 Mb			100 Mb				100 Mb
							1	2 3		1	2	3
			1	2	3	4		4					4
					AUTO							For RJ-45 &
								For RJ-45 &
9 ) 10 11 12								Fiber port				Fiber port
5	6	7	8
1	2	3	4					Jumper Settings for HDX/FDX
						J1	J2	J3	J4				Bottom QPM Retaining
Printed Circuit card
												Two(50) Pin
													QPM Connectors
						TOP					(inserts into main board)

2

LED

gure 3.6 Combo ports, internal jumper settings. Note: Be certain that the main power is sconnected before opening the unit or changing any internal jumper settings

opular. Auto-Negotiation on RJ-45 and FDX on fiber port works well under most rcumstances, but cannot always be depended upon to work as expected. If full-duplex will not nction properly in your setup, internal jumpers allow the speed and mode of the LE14XXA-

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