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Black Box Modular Switches
Installation and User Guide (8/99)
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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 which support only half-duplex by default.
Therefore, the default setting of full-duplex (fiber ports) is generally desirable because
it is widely used and allows for the connection of various devices without re
-
onfiguration(special
ly along with switches). Under certain conditions,(where the connected
device is half duplex and does not support full
-duplex; or the connected device does not support
full
-duplex properly) no full-duplex is better and the internal jumper settings will permit this to
be selected on a per
-port basis.
3.6
Combo(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
Figure 3.6 Combo ports, internal jumper settings. Note:
Be certain that the main power is
disconnected before opening the unit or changing any internal jumper settings
popul
ar. Auto-Negotiation on RJ-45 and FDX on fiber port 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 LE14
XXA-
)
2
3
1
4
1
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
10 or100Mbps Full
Duplex
10 or100Mbps Half
Duplex
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
JP1-2, 6-7, 9-10
FDX @100 config 10 Mb or 100 MbPin 1-2, 6-7, 9-10
HDX@100 config
NO
YES
JP1-2, 7-8, 11-12
Pin 1-2, 7-8, 11-12
10Mb or 100 Mb
J1
5 6 7 8
9 10 11 12
1 2 3
J1
44
1 2 3 4
J1 J2 J3
100 Mb
1 2 3
J1
AUTO
10/100 Mbps
Auto Negotiation
10/100 Mb
J1
1 2 3 4
For RJ-45 ports only
For RJ-45 &
Fiber port
For RJ-45 &
Fiber port
JP2 -3, 6-7, 10-11 Pin 2-3, 6-7, 10-11 Auto-Negotiation YES
10/100 Mb