3Com 3C13886 Installation Guide - Page 31

Interface LEDs, DIP switch, Description, impedance, ohm impedance, Table 2-11

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

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3Com Router 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:
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:
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
ON means carrier signal has been received.
OFF means no carrier signal has been received.
ACT
OFF means no data is being transmitted or received; blinking means data is
being received or/and transmitted.