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Black Box Modular Switches Installation and User Guide (8/99)
17
3.2 Connecting Ethernet Media
The Black-Box LE14XXA-Series Fiber Switches are specifica
lly designed to
support all standard Ethernet media types within a single Switch unit. This is
accomplished by using a family of 4-
port Modules (4PMs) which can be individually
selected and configured per-port. See Section 2.4 for a description of the 4PMs.
The various media types supported along with the corresponding IEEE 802.3 and
802.3u standards and connector types are as follows:
IEEE Standard Media Type Max. Distance Port Module
Fiber:
100BASE-FX mm
1
Fiber 2.0km (6,562 ft) LE1428C, LE1419C
sgl.m
2
Fiber 18.0km (95K ft) LE1421C
small form factor mm
1
Fiber 2.0km (6,562 ft) LE1422C, LE1423C
10BASE-FL mm
1
Fiber 2.0km(6,562 ft) LE1424C
Copper:
10BASE-T & 100BASE-TX twisted pair 100m (328 ft) LE1425C
1
mm = multi-mode
2
sgl.m = single-mode
3.2.1 Connecting Fiber Optic ST-type, “twist-lock”
The following procedure applies to installations using a 4PM with ST-type fiber
connectors. This procedure applies to ports using a LE1428C or LE1424C.
1. Before connecting the fiber optic cable, remove the protective dust caps from the
tips of
the connectors on the 4PM. Save these dust caps for future use.
2. Wipe clean the ends of the dual connectors with a soft cloth or lint-free lens tissue
dampened in alcohol. Make certain the connectors are clean before connecting.
Note: One strand of the duplex fiber optic cable is coded using color bands at
regular intervals; you must use the color-
coded strand on the associated ports at each
end of the fiber optic segment.
3. Connect the Transmit (TX) port (light colored post) on the 4PM to the Receive (RX)
port of the remote device. Begin with the color-coded strand of the cable for this first TX-
to
RX connection.
4.
Connect the Receive (RX) port (dark colored post on the PM) to the Transmit (TX) port
of the remote device. Use the non-color coded fiber strand for this.
5. The LINK LED on the front of the 4PM will illuminate when a proper connection has
been established at both ends (and when power is ON in the unit). If LINK is not lit after
cable connection, the normal cause is improper cable polarity. Swap the fiber cables at
the 4PM connector to remedy this situation.