166CHAPTER 4: FLEXIBLE INTERFACE CARDS

Figure 203 75-ohm 4E1 adapter cable

n

Both 75-ohm 4E1 and 120-ohm 4E1 adapter cables are required for

FIC-4E1/FIC-4E1-F. But E1 cables are optional, and please order together with

 

FIC-4E1/FIC-4E1-F; by default, they are not provided.

 

In addition, you are available with 75-ohm-to-120-ohm adapters.

Internal DIP Switch The FIC-E1 and the FIC-E1-F cards provide internal DIP switches, the setting of

which decides interface impedance and the grounding mode. Table 114 DIP switches and E1 interfaces of the FIC-E1/FIC-E1-F cards

 

FIC-1E1/F

 

 

 

 

 

 

Card

IC-1E1-F

FIC-2E1/FIC-2E1-F

FIC-4E1/FIC-4E1-F

 

 

 

 

 

 

 

 

 

 

DIP switch

S1

S1

S2

S1

S2

S3

S4

 

 

 

 

 

 

 

 

Controlle

Interface

Interface

Interface

Interface

Interface

Interface

Interface

d E1

0

0

1

0

1

2

3

interface

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

By default, all the DIP switch BITs are placed to the position of ON, as illustrated in the following figure:

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Image 166
3Com MSR 20, MSR 30, MSR 50 manual FIC-4E1/FIC-4E1-F by default, they are not provided