SGND & FRGND (JB4)

In the connected position, this strap links Signal Ground and frame ground through a 100 ohm resistor. In the open position, signal ground is disconnected from frame ground.

JB4

Position 1&2 = SGND and FRGND Connected

Position 2&3 = SGND and FRGND Not Connected

3.2.3 Model 1001RCM11548C Strap Settings

Figure 7 shows strap locations for the Model 1001RCM11548C (DB-15) rear cards. These straps determine various grounding characteristics for the terminal interface and twisted pair lines. JB3 and JB4 are user configurable.

The table below provides an overview of interface strap functions

JB3 1 2 3

JB4

1 2 3

Figure 7. 1001RCM11548C strap locations

for the rear interface cards. Following the table overview are detailed descriptions of each strap’s function.

INTERFACE CARD STRAP SUMMARY TABLE #3

Strap

Function

Position 1&2

Position 2&3

 

 

 

 

JB3

DTE Shield (Pin1) & FRGND

Connected*

Open

 

 

 

 

JB4

FRGND & SGND (Pin 8)

Connected*

Open

 

 

 

 

* Indicates default setting

DTE Shield (DB-15 Pin 1) & FRGND (JB3)

In the connected position, this strap links DB-15 pin 1 & frame

ground. In the open position, pin 1 is disconnected from frame ground. JB3

Position 1&2 = DTE Shield (Pin 1) and FRGND Connected Position 2&3 = DTE Shield (Pin 1) and FRGND Not Connected

SGND & FRGND (JB4)

In the connected position, this strap links DB-15 pin 8 (Signal Ground) and frame ground through a 100 ohm resistor. In the open position, pin 8 is connected directly to frame ground.

JB4

Position 1&2 = SGND (Pin 8) and FRGND Connected through a 100 ohm resistor

Position 2&3 = SGND (Pin 8) and FRGND Directly Connected

3.2.4 Model 1001RCM11575 Strap Settings

Figure 8 shows strap locations for the Model 1001RCM11575 (DB- 15/Dual BNC) rear cards. Figure 8 shows strap locations for the Model 1001RCM11548C (DB-15) rear cards. These straps determine various grounding characteristics for the terminal interface and twisted pair lines. JB3 and JB4 are user configurable.

JB4 JB3

Figure 8. 1001RCM11575 strap locations

INTERFACE CARD STRAP SUMMARY TABLE #3

Strap

Function

Position 1&2

Position 2&3

 

 

 

 

JB3

DTE Shield (Pin1) & FRGND

Connected*

Open

 

 

 

 

JB4

FRGND & SGND (Pin 8)

Connected*

Open

 

 

 

 

* Indicates default setting

15

16