Black Box Modular Switches Installation and User Guide (8/99)
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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 includ
e 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.
3.7 Fiber 10Mb ports, internal jumper settings for 10Mb fixed Half- or Full-
at all ports
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-
This is desirable when there are devices connected which will not operate correctly with half-
duplex. Examples include Switches that support full-duplex only.
1
10 Mb
JF3
Bottom QPM Retaining
Jumper Settings for HDX/FDX
Two(50) Pin
4PM Connectors
(inserts into main board )
Printed Circuit card
TOP
LED
10 Mb
Factory Settings
10Mbps Full
Duplex
10Mbps Half Duplex
Jumper Settings for 10Mb Fiber Half or Full Duplex
JF3
JF3
JFD1
JF3
1
2
3
4
5 6
7 8
Jumper Port
Function Factory Settings Speed
JP2-4
FDX @10Mb config 10 Mb
HDX@10Mb config YES
NO
Pin 2-4
10 Mb
OPEN OPEN
JFD1
1 2
3
4
JFD1
1 2
3 4
JFD1
1 2
3
4
10Mbps Half-
Duplex
10Mbps Full-
Duplex
Factory Settings
Jumper Settings for HDX/FDX
JP3
JP3
JFD1
JFD1
JP1-3
OPEN
PIN 1-3 FDX@10Mb config
OPEN
HDX @10Mb config
NO
YES
10Mb
10Mb
