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Black Box Modular Switches Installation and User Guide (8/99)
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Therefore, the default setting of auto-
negotiation (copper ports) is generally desirable
because it is widely used and allows for the connection of various devices without re-
configuration. Under certain conditions,(where the connected device is full duplex and does not
support Auto-negotiation; or the connected device does not support Auto-negotiation pr
operly)
no auto-
negotiation is better and the internal jumper settings will permit this to be selected on a
per-port basis.
See Section 4.4 for additional information on auto-negotiation functionality.
3.5 Fiber ports, internal jumper settings for 100Mb fixed Half- or Full-
Duplex, per port
The factory (or default) setting is for full-
duplex on all fiber 100Mbps ports, which is generally
popular. It works well under most circumstances, but cannot always be depended upon to work
as expected. If full-duplex will not function properly in your setup, internal jumpers allow the
speed and mode of the LE14XXA-Series fiber 4-ports to be
Figure 3.5. Fiber ports, internal jumper settings. Note: Be certain that the main power is
disconnected before opening the unit or changing any internal jumper settings
2
3
1
4
1
100 Mb
J4
Bottom QPM Retaining
Jumper Settings for HDX/FDX
Two(50) Pin
QPM Connectors
(inserts into main board)
Printed Circuit card
TOP
LED
100 Mb
Factory Settings
100Mbps Full
Duplex
100Mbps Half
Duplex
Jumper Settings for 100Mbps Fiber Half or Full Duplex
Jumper Port
Function Factory Settings Speed
JP1-2, 6-7, 9-10
FDX @100 config 100 Mb
Pin 1-2, 6-7, 9-10
HDX@100 config
NO
YES
JP1-2, 7-8, 11-12
Pin 1-2, 7-8, 11-12
100 Mb
J1
5 6 7 8
9 10 11 12
1 2 3
J1
1 2 3
J1
4
4
1 2 3 4
J1 J2 J3