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Black Box Modular Switches
Installation and User Guide (8/99)
8
2.2.2 4
-port modules, 100Mb fiber
Fig.2.2.2 Fiber 4
-Port Modules, LE1420C, LE1419C LE1423C LE1422C
In a fiber 4-port module, all of the fiber ports are of the same speed, the same multi- or
single
-mode, and the same connector type. Multi-mode 100Mbps models are available with ST,
SC, MTRJ, and VF
-45 connectors. Single-mode 100Mbps models are available with SC
connectors.
The 100Mb fiber 4-port modules on the Black Box LE14XXA-Series normally are set
(factory default) to operate in full
-duplex mode for best fiber distance and performance. On the
LE14XXA
-Series, the user may select full- or half-duplex mode per-port with an internal jumper
setting (See Section 3.4) for the flexibility to adapt to any type of Fast Ethernet devices.
On Black Box fiber 4PMs, there are three LED’s per fiber port. The Link (LK) LED
indicates “ready for op
eration” when lit, another LED indicates operation in full-duplex mode
when ON (when it is OFF, operation is half
-duplex), and an LED indicates Receiving Activity
(ACT) on the port. A fiber cable must be connected to each 100Mb port and a proper link (LK
it) must be made with the device at the other end of the cable in order for the LK LEDs to
provide valid indications of operating conditions.
2.2.3 4
-port modules, 10 Mb fiber
The 10 Mb model LE1424C fiber 4-port
module is the same as the 100Mb LE142
8C, except
for 10Mb speed rather than 100Mb speed. It
supports distances according to the 10Base
-FL standard, i.e., 2Km distance for multi-mode fiber.
(Single
-mode for 10km distance may be available as a special order).
ACT
1
2
3
4
LK
FDX/HDX
VF45-Small Form Factor
1 2 3 4
1
FDX/HDX
2
3
4
ACTLK
ST-Type
1 2 3 4
2
3
1
4
LK
FDX/HDX
ACT
SC-Type
1 2 3 4
ACT
2
3
1
4
LK
FDX/HDX
MTRJ-Small Form Factor
1 2 3 4
1
FDX/HDX
2
3
4
ACTLK
ST-Type
1 2 3 4