13
14
Position 2&3 = DTE Shield (Pin 1) and FRGND Not Connected
SGND & FRGND (JB4)
In the connected position, this strap links DB-25 pin 7 (Signal
Ground) and frame ground through a 100 ohm resistor. In the open
position, pin 7 is connected directly to frame ground.
JB4
Position 1&2 = SGND (Pin 7) and FRGND Connected through
a 100 ohm resistor
Position 2&3 = SGND (Pin 7) and FRGND Directly Connected
3.2.2 Model 1001RCM13448C Strap Settings
Figure 6 shows the strap location for the Model 1001RCM13448C
(M/34) rear card. This strap determines whether Signal Ground and
Frame Ground will be connected.
The table below provides an overview of interface strap functions
for the rear interface cards. Following the table overview are detailed
descriptions of each strap’s function.
DTE Shield (M/34 Pin A) & FRGND (JB3)
In the connected position, this strap links M/34 pin A & frame
ground. In the open position, pin A is disconnected from frame ground.
JB3
Position 1&2 = DTE Shield (Pin A) and FRGND Connected
Position 2&3 = DTE Shield (Pin A) and FRGND Not Connected
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 charac-
teristics for the terminal interface and twisted pair lines. JB3 and JB4
Figure 6. 1001RCM13448C strap locations
INTERFACE CARD STRAP SUMMARY TABLE #2
Strap
Function
Position 1&2
Position 2&3
JB3
DTE Shield (Pin A) & FRGND
Connected*
Open
JB4
FRGND & SGND (Pin B)
Connected*
Open
* Indicates default setting
Figure7. 1001RCM11548C strap locations
