Description of Hardware
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Description of Hardware
100BASE-FX SC Fiber Ports
The switch provides 24 SC fiber ports on the front of the switch. Each single-fiber SC
connector supports a 100BASE-FX full-duplex link to a subscriber’s media converter
unit. The switch’s fiber transceivers use Wavelength Division Multiplexing (WDM)
technology to achieve bi-directional operation (1550 nm transmit, 1310 nm receive)
over a single optical fiber. The WDM single-mode fiber links can run up to 15 km.
The 100 Mbps bandwidth of the fiber links can be restricted by rate-limiting, which is
configurable via a management connection. Each port also supports
auto-negotiation of flow control, so the switch can automatically prevent port buffers
from becoming saturated.
1000BASE-T RJ-45 Ports
The two RJ-45 ports on the right side of the front panel are 10/100/1000BASE-T
uplink ports that are shared with the two Small Form-factor Pluggable (SFP) slots. If
an SFP transceiver (purchased separately) is installed in a slot and has a valid link
on the port, the associated RJ-45 port is disabled.
These ports support automatic MDI/MDI-X operation, so you can use
straight-through cables for all network connections to PCs or servers, or to other
switches. (See “Twisted-Pair Cable and Pin Assignments” on page B-1.)
Both ports support auto-negotiation, so the optimum transmission mode (half or full
duplex) and data rate (10, 100, or 1000 Mbps) can be selected automatically, if this
feature is also supported by the attached device. If a device connected to one of
these ports does not support auto-negotiation, the communication mode of that port
can be configured manually.
Each port also supports IEEE 802.3-2002 auto-negotiation of flow control, so the
switch can automatically prevent port buffers from becoming saturated.
SFP Slots
The Small Form Factor Pluggable (SFP) transceiver slots are shared with the two
1000BASE-T RJ-45 ports (Ports 25~26). If an SFP transceiver (purchased
separately) is installed in a slot and has a valid link on the port, the associated RJ-45
port is disabled.
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