Black Box LE14XXA Manual De Usuario

Black Box Modular Switches           

        Installation and User Guide (8/99) 

23 

Series Combo- 4ports to be fixed, even if the attached device may or may not  support full-

duplex.  This is desirable when there are unknown devices presently or potentially connected, 

which will not operate correctly  with full-duplex. Examples include hubs that support only half

duplex by default.  

 

 

If auto-negotiation will not function properly in your setup, internal jumpers 

allow the speed and mode of the LE14XXA-Series RJ-45 (copper) 4-ports to be fixed, even if 

the attached device may or may not  support auto-negotiation.  This is desirable when there are 

unknown devices presently or potentially connected, which will not operate correctly  with 

auto-negotiation. Examples include some NICs and most Media Converters. 

The factory (default) setting is for half-duplex on all fiber 10Mbps ports, 

which is generally popular. HDX works well under most circumstances. If half-duplex  on 

10Mbps will not function properly in your setup, internal jumpers allow the duplex mode of the 

LE14XXA-Series fiber 4- ports to be changed, even if the attached device supports full-duplex.  

This is desirable when there are devices connected which will not operate correctly  with half-

duplex. Examples include Switches that support full-duplex only.  

JF3

JF3

JF3

JFD1

4

5          6

7         8

JP2-4

FDX @10Mb config

 10 Mb

HDX@10Mb config

YES

NO

Pin 2-4

 10 Mb

OPEN

OPEN

4

4

4

JP3

JP3

JFD1

JFD1

JP1-3

OPEN

PIN 1-3

FDX@10Mb config

OPEN

HDX @10Mb config

NO

YES

10Mb

10Mb