6 Product Overview ELH100-12/24TX
Figure1-3 shows the Collision, Activity, Full/Half duplex, and LinkLEDs
forthe switch/media modules. TheseLEDs are positioned to the left of the
ports.In addition, the 10Base-T/100Base-TX module includes a 100M
LEDto right of the ports to indicate speed (where On indicates that the
portis operating at 100 Mbps, and Off indicates 10 Mbps).
Figure1-3. PortLEDs o n the Switch/MediaModules
Table1-3 defines the performance of the port LEDson the optional modules.
Table1-3. PortLEDs for Modules Defined
Name Function
Collision Flashing:Two or more devices attempted to transmit data at the same
time.(Normal situation under Ethernet CS MA/CD.)
Activity Flashing:Indicates the presence oftransmit and/ or receive activity.
Off:Indicates the absence of transmitor receive activity.
Full/Half On: Indicates the port is in full duplex mode.
Off:Indicates the port is in half duplex mode.
Link On:Indicates a valid conne ction (link) on the associated port.
Off:Indicates no link on the associated port.
100M* On: Indicates that the port is operating at 100 Mbps.
Off:Indicates that the port is operating at 10 Mbps .
*This LED only appears on the 10Base-T/100Base-TX module.
TheSwitch/Media modules do not support Span-
ningTree, which is intended to prevent network
loopsfrom forming. There is no loop detection.The
useris cautioned to understand an d avoid configu-
rationsthat can create a loop.
Link
Activity
Full/Half
Collision