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Black Box Modular Switches Installation and User Guide (8/99)
41
connection to another
hub or switch typically.) When used for segments going to workstations
and other user node device connections, the MDI-X push-button should be in the OUT (=)
position.
The LE1425C will support 10BASE-
T unshielded twisted pair wiring (UTP)
environments with maximum segment distances up to 100m (325 ft.), or shielded twisted pair
wiring (STP) of 150m (500 ft.). Each port has an Activity (ACT) LED indicating packets being
received, a Link (LK) LED that indicates proper connectivity with the remote device
when lit, a
FDX/HDX LED to indicate full-duplex mode when lit (or half-
duplex when off), and a “speed”
LED indicating 100Mb when lit (or 10 Mbps when off).
Important Note: For the LE1425C Crossover Push-button -
OUT for workstations and user connections.
IN for Up-Link connections to other hubs, etc.
The RJ-45 pins normally (TP crossover push-button DOWN) are per the standard for
hubs-to-users twisted pair wiring: 1 = receive+, 2 = receive-, 3 = transmit+, 6 = transmit-
,
other pins not used. When the TP crossover push-button is UP, the pins of the RJ-
45 port
are per the standard for up-
links using twisted pair wiring, i.e., the transmit and the receive
pairs are exchanged: 1 = transmit+, 2 = transmit-, 3 = receive+, 6 = receive-
, other pins not
used.
5.2.7 LE1426C, “3TP + 1F” 3 10/100Mb RJ-45 and 1 100Mb Fiber SC (multi-mode)
Connector Combo 4-Port
The LE1426C Combo 4-port
supports three auto-negotiating twisted pair
ports at 10/100Mbps FDX/HDX, and one
fiber port with 100Mbps multi-mode FX SC
connector. The three RJ-45 ports on the right
operate the same as those in the same place
on the QPM-RJ45 module.
The fiber SC connector functions as a fiber optics transceiver to support 100BASE-
FX network segments. When installed in a LE14XXA-Series Fiber Switches, it supports fiber
optic cable distances up the IEEE-standard 100Mbps distance limits, i.e., typically 2km at full
-
duplex and 412m at half-duplex. The factory default setting is for full-duplex operation, and a
jumper on the module must be moved to select half-duplex. (See Section 3.4).
10/100BASE-T and 100BASE-FX Combo
Quad-Port Connectors
FULL/HALF
DUPLEX (RJ-45)
ACTIVITY
LINK
2
SPEED
LK
HDX/FDX
FULL/HALF DUPLEX(FIBER)
100/10 FDX/HDX
ACT
1 2 3 4
2
5
4
1
1
4
3
3
5