32
2-WIRE IDSL LINE DRIVER RACK CARDS
Table 3-12. Interface card strap summary.
Strap
Function
Position 1 & 2
Position 2 & 3
JB3
DTE Shield (Pin 1) and FRGND
Connected*
Open
JB4
SGND and FRGND (Pin 8)
Connected*
Open
*Default setting
DTE Shield (DB15 Pin 1) and FRGND (JB3)
In the connected position, this strap links DB15 pin 1 and 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 DB15 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
