3com MSR 20 User Manual

SIC-1GEC

CAUTION: SIC-1GEC uses COMBO interface; therefore it cannot support fiber and
electrical interfaces at the same time. When the router is powered on, the
electrical interface takes effect by default. If you want to use a fiber interface, use
a command to configure it.

Interface LEDs

The following figure illustrates the SIC-1GEC panel.

Figure 37 SIC-1GEC panel

The following table describes the electrical interface LEDs on the left of the
SIC-1GEC panel.

Interface Cable

Normally, category-5 twisted pair cable is adopted to connect the 10BASE-T
/100BASE-TX Ethernet interface to the Ethernet, as shown in the following figure:

Table 18 LEDs for the electrical interface on the left of the SIC-1GEC panel

LED Description

LINK

ON means carrier signal is received;

OFF means no carrier signal is
received;

Green: Data is being received and
transmitted at a speed of 1000 Mbps.

Yellow: Data is being received and
transmitted at a speed of 100/10
Mbps.

ACT

OFF: No data is being received and
transmitted;

Blinking: Data is being received and
transmitted.

Table 19 LEDs for the fiber interface on the right of the SIC-1GEC panel