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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 2 Smart Interface Cards
2-16
DIP switch Description
75 -ohm
impedance
120 -ohm impedance
8BIT
Switch for RxShield
grounding options
-
OFF: RxShield grounding
via capacitor
ON: RxShield directly
grounding
Caution:
z When setting internal DIP switch, you are recommended to: turn ON all BITs from 1 to 8 when a
75-ohm cable is connected. Turn OFF all BITs from 1 to 8 when a 120-ohm cable is connected;
z The default configuration of internal DIP switch is that all the 8 positions of the BIT switch are ON,
that is, the E1 interface impedance is 75-ohm.
2.4.5 Interface LEDs
Router 1-Port Fractional E1 SIC panel is shown in the following figure:
Fractional E1
Figure 2-15 Router 1-Port Fractional E1 SIC panel
The status description of the LEDs is given in the following table:
Table 2-11 Description of the LEDs on Router 1-Port Fractional E1 SIC panel
LED Description
LINK
OFF means the link is not connected. ON means the link is connected and
can correctly receive carrier (E1 mode) or frame synchronous signals
(cE1/PRI or FE1).
ACT
OFF means no data is being transmitted or received; blinking means data is
being received or/and transmitted.