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CHAPTER 2: PRODUCT DESCRIPTION PRODUCT DESCRIPTION
MULTILINK ML2400 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL 2–3
2.2 Communications Modules
2.2.1 Four-Port Modules
The four-port fiber option for the modular slot comes in three configurations:
• A1 module: 4 × 10 Mb – ST mm fiber
• A2 module: 4 × 100 Mb – ST mm fiber
• A3 module: 4 × 100 Mb – SC mm fiber
FIGURE 2–1: Example two-Port 10Mb mm fiber ST module & two-Port 100Mb mm fiber ST module
The default setup on the 10 Mb fiber module is half-duplex, which allows the ML2400 to
connect to any 10 Mb hub, media converter, or almost any device with a 10 Mb fiber
Ethernet port. The default setting of the 100 Mb fiber modules is full-duplex. User mode
control per port through the software “port settings” is the same as the other modules.
The status LED layout on a 10Mb fiber port pair is different from that on a 100 Mb fiber port
pair. Notice that on the above image, where the 2 x 10 Mb ST mm fiber poarts have three
LEDs next to each port, the 2 x 100 Mb ST mm fiber ports have 4 LEDs combined for the 2
ports, and under each port is a link LED. In both cases, the number of status LEDs is the
same for each port.
There are three LEDs per fiber port. The Link (LK) LED, when lit, indicates "ready for
operation" on that port, the F/H LED indicates operation in full-duplex mode when ON
(half-duplex when OFF), and the blinking ACT LED indicates receiving activity on the port. A
fiber cable must be connected to the port, and the link (LK) indicator for that port must be
ON (indicating there is a powered-up device at the other end of the cable) in order for a LK
LED to provide valid indications of operating conditions on that port. Color-coding on the
panel of the module shows which LEDs belong to which port.
The fiber ports support fiber cabling distances according to the 10Base-FL and 100Base-
FX standards, i.e., 2 km distance for multi-mode fiber. A single-mode option for greater
distance may be available as a special order, contact GE Multilin.
The combo four-port modules are combinations of copper and fiber media, available as
two 10/100 switched RJ45 copper ports and two 100 Mb switched multi-mode fiber ST or
SC ports as shown below.
•AF module: 2 × 10 Mb ST mm fiber and 2 × 100 Mb ST mm fiber
•AG module: 2 × RJ45 10/100 Mb copper and 2 × 100 Mb SC sm fiber