30CHAPTER 2: SMART INTERFACE CARDS

c

Interface LEDs

Table 6 Description and settings of the internal DIP switch of SIC-ERRI/SIC-1E1-F

 

 

 

120-ohm

DIP switch

Description

75-ohm impedance

impedance

 

 

 

 

7BIT

Switch for RxShield

-

ON: RxShield

 

grounding options

 

grounding

 

 

 

OFF: RxShield

 

 

 

ungrounding

 

 

 

 

8BIT

Switch for RxShield

-

OFF: RxShield

 

grounding options

 

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.

SIC-1EPRI panel is shown in the following figure:

Figure 19 SIC-1EPRI panel

SIC-1E1-F panel is shown in the following figure:

Figure 20 SIC-1E1-F panel

Fractional E1

The status description of the LEDs is given in the following table:

Table 7 Description of the LEDs on SIC-1EPRI/SIC-1E1-F 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.

 

 

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3Com MSR 30, MSR 20, MSR 50 manual Interface LEDs, SIC-1EPRI panel is shown in the following figure