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Black Box Modular Switches Installation and User Guide (8/99)
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An important feature of the LE14XXA-Series is the use of 4-Port Modules (4PMs)
and for flexible mixed-media connectivity to RJ-45 and fiber media use of Combo 4-
port module. Since the LE14XXA-Series have dual-speed capability for copper-
port,
the front port slots are designed to support all standard Ethernet media types at 10 or
100Mps speed. Each 4PM provides one port for connecting one Ethernet segment
with its individual connector type and media.
For a list and brief illustration of 4-Port Module types, refer to Section 2.4
Each 4PM is individually described in the following sections.
5.2.1 LE1428C, 100Mb multi-mode FX-ST-4-port Module, “twist lock” connector
The LE1428C is a multi-mode 100Mbps fiber optic 4-port
module equipped with a dual ST-type
connector. It 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-specified 100Mbps shared-collision-
domain distance limits, i.e., typically 2km at
full-duplex and 412m at half-duplex.
The module is equipped with an Activity (ACT) LED, a Link (LK) LED which
indicates proper connectivity with the remote device when lit, and
the FDX/HDX LED indicates
the full or half-duplex mode. Lettering on the front of the module identifies it as “100 FX” to
avoid confusion with other similar-looking 10 Mb fiber 4PMs.
5.2.1a LE1424C, 10 Mbps multi-mode FL-ST-4-port type, “twist-lock” connector
The LE1424C is a multi-mode 10 Mbps fiber optic module equipped with a dual ST
-
type connector. It looks similar to the 100Mb LE1428C, but has the lettering “10 Mb” on the
front to distinguish it. It supports fiber optic cable distances up the IEEE -standard 10 Mb
distance limits , i.e., typically 2km at full-duplex and at half-duplex.
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, and a
FDX/HDX LED to indicate full-duplex mode when lit (or half-
duplex when off). Lettering on the
1
ACTIVITY
LINK
2
100BASE-FX, and 10BASE-FL
ST Connectors
1
2
2
3
1
FDX/HDX
4
LK
3
FULL/HALF
DUPLEX MODE
ACT
1 2 3 4
3