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18
Table 19 provides an overview of strap functions for the DB-25/modular
cards. Following this overview is a detailed description of each strap's
function.
* indicates factory default
Line Shield & FRGND (JB2)
This strap pertains to the line interface. In the connected (closed) posi-
tion, this strap links RJ-11 pins 1 and 6, or RJ-45 pins 2 and 7 to frame
ground. These pins can be used as connections for the twisted pair
cable shield. In the open (disconnected) position, pins 1 and 6 (or 2 and
7) remain connected to each other, but are “lifted” from the frame ground
(see Table 20).
DTE Shield (Pin 1) & FRGND (JB3)
In the connected (closed) position, this strap links DB-25 pin 1 and frame
ground. In the open (disconnected) position, pin 1 is “lifted” from frame
ground (see Table 21).
Table 19:
DB-25/RJ-11 & DB-25/RJ-45 Interface Card Strap Summary
Strap Function Position 1&2 Position 2&3
JB2 Line Shield & FRGND Connected Open*
JB3 DTE Shield (Pin1) &
FRGND
Connected Open*
JB4 FRGND & SGND Connected Open*
Table 20:
Line Shield & FRGND (JB2) Settings
JB2
Position 1&2 = Line Shield and FRGND Connected
Position 2&3 = Line Shield and FRGND Not Connected
Table 21:
DTE Shield (Pin 1) & FRGND (JB3) Settings
JB3
Position 1&2 = DTE Shield (Pin 1) and FRGND Connected
Position 2&3 = DTE Shield (Pin 1) and FRGND Not Connected