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CHAPTER 2: PRODUCT DESCRIPTION PRODUCT DESCRIPTION
MULTILINK ML1200 MANAGED FIELD SWITCH – INSTRUCTION MANUAL 2–3
2.1.1 Four-port SFF fiber modules (CC Module, CD Module), 100Mb fiber
In a four-port SFF (Small Form Factor) fiber port module, all of the fiber ports are of the
same speed (100Mb), mode, and connector type. Small Form Factor (SFF) Fiber Ports come
in multi-mode forms MT-RJ or LC-type connectors, and single-mode form LC-type
connectors.
The 100Mb fiber four-port modules for the Multilink ML1200’s normally are set (factory
default) to operate in full-duplex mode for best fiber distance and performance. The user
may select full- or half-duplex mode per-port through set port command. The set-up of
the software gives the user flexibility to adapt to any FDX or HDX type of Fast Ethernet
devices).
There are three LED’s per fiber port. The Link (LK) LED indicates “ready for operation” on
that port when lit. The F/H LED indicates operation in full-duplex mode when ON (half-
duplex when OFF). The blinking ACT LED indicates receiving Activity on the port. A fiber
cable must be connected into a SFF 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.