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Black Box Modular Switches Installation and User Guide (8/99)
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5.2.4 LE1422C, 100Mb multi-mode FX 4-Port, MTRJ small-form-factor connector
LE1422C is a multi-mode fiber optic 4-port module equipped with a small-form-
factor
MTRJ-type connector. It looks almost like
an RJ-45 port, but it is black in color. The
MT-RJ’s small size and ease of connection
make it a good choice for 100Mbps “fiber-
to-the-desktop” Ethernet connectivity.
When installed in a LE14XXA-Series full-
duplex Switch, it supports fiber optic cable
distances up the IEE-standard 100Mbps
shared-collision-domain distance limits, i.e.,
typically 2 km at full-duplex and 412m at
half-duplex.
The functionality of this 100BASE-FX multi-mode 4PM is same as the ST and SC-
types, and it is equipped with the same ACTIVITY (ACT), LINK (LK) LEDs to indicate
proper connectivity with the remote device and (FDX/HDX) indicate the FULL OR HALF
DUPLEX MODE at the port. It has the same “100Mb FX” lettering on the faceplate. Note that
the other end of the fiber cable may have a different connector, not necessarily an MT-
RJ type.
5.2.5 LE1423C, 100Mbps multi-mode FX 4-Port, VF-45 small-form-factor connector
“small-form-factor”
ACT
1
2
3
4
LK
FDX/HDX
1
ACTIVITY
LINK
2
100BASE-FX MTRJ
Connectors
1
2
3 FULL/HALF
DUPLEX MODE
3
1 2 3 4