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Installation and User Guide (8/99)
20
view and easy to read. Rack
-mount installation requires special rack-mounted brackets and
screws (included with each LE1408A and LE1416A unit). The brackets attach to the front sides
of the Switch, which is then fastened into a standard 19” rack.
3.4
RJ-45 ports, internal jumper settings for 10/100Mb (auto-negotiation) or for
fixed Half
- or Full-Duplex 100Mb, per port
The factory (or default) setting is for auto-negotiation on all RJ-45 ports, which is generally
popular. It works well under most circumst
ances, but cannot always be
Figure 3.4.
RJ-45 ports, internal jumper settings. Note: Be certain that the main power is
disconnected before opening the unit or changing any internal jumper settings
.
depended upon to work as expected. 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 d
evices presently or potentially connected, which will not
operate correctly with auto
-negotiation. Examples include some NICs and most Media
Converters.
1
AUTO
10/100 Mbps
Auto Negotiation
100 Mb
J4
Bottom QPM Retaining
Jumper Settings for HDX/FDX
and Auto Negotiation
Two(50) Pin
QPM Connectors
(inserts into main board)
Printed Circuit card
FRONT
TOP
LED
Uplink
Switch
100 Mb
10/100 Mb
Factory Settings
100Mbps Full
Duplex
100Mbps Half
Duplex
Jumper Settings for Auto-Negotiation, or for 100MB Half or Full Duplex
Jumper Port Function Factory Settings Speed
JP1-2, 6-7, 9-10
Pin 2-3,6-7,10-11
FDX @100 config
100 Mb
JP2-3,6-7, 10-11
Pin 1-2, 6-7, 9-10
HDX@100 config
NO
10/100 Mb,
NO
JP1-2, 7-8, 11-12 Pin 1-2, 7-8, 11-12
Auto-Negotiation YES
100 Mb
J1
5 6 7 8
9 10 11 12
J1
1 2 3
J1
1 2 3
J1
44
1 2 3 4
1 2 3 4
J1 J2 J3