Description of Hardware
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Description of Hardware
10/100/1000BASE-T Ports
The switches contain 24/48 RJ-45 ports that operate at 10 Mbps or 100 Mbps, half
or full duplex, or at 1000 Mbps, full duplex. Because all ports on these switches
support automatic MDI/MDI-X operation, you can use straight-through cables for all
network connections to PCs or servers, or to other switches or hubs. (See
“1000BASE-T Pin Assignments” on page B-3.)
Each of these 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 a device connected to one of these ports does not support
auto-negotiation, the communication mode of that port can be configured manually.
SFP Slots
The Small Form Factor Pluggable (SFP) transceiver slots are shared with four of the
RJ-45 ports (ports 21~24 for the ES4524D and ports 45~48 for the ES4548D). In its
default configuration, if an SFP transceiver (purchased separately) is installed in a
slot and has a valid link on its port, the associated RJ-45 port is disabled and cannot
be used. The switch can also be configured to force the use of an RJ-45 port or SFP
slot, as required.
Port and System Status LEDs
These switches include a display panel for key system and port indications that
simplify installation and network troubleshooting. The LEDs, which are located on
the front panel, are shown below and described in the following tables.
Figure 1-3 Port LEDs
Table 1-1 Port Status LEDs
Label Color Description
Link/Activity/
Speed
On/Flashing Amber Port has a valid link at 10 or 100 Mbps. Flashing indicates activity.
On/Flashing Green Port has a valid link at 1000 Mbps. Flashing indicates activity.
Off The link is down.
Port Status LEDs
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