Interface Leds - 3Com 3C13886 - Router OC-3 ATM SML Flexible Interface Card Installation Manual

3Com Router Module Guide
DIP switch
8BIT
Caution:
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;
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:
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
LINK
ACT
Description
Switch for RxShield
grounding options
Fractional E1
ON means carrier signal has been received.
OFF means no carrier signal has been received.
OFF means no data is being transmitted or received; blinking means data is
being received or/and transmitted.
2-16
Chapter 2 Smart Interface Cards
75 -ohm
impedance
OFF: RxShield grounding
via capacitor
-
ON: RxShield directly
grounding
Description
120 -ohm impedance