The table below provides an overview of strap functions for the DB-
25/modular cards. Following this overview is a detailed description of
each strap's function.
Line Shield & FRGND (JB2)
This strap pertains to the line interface. In the connected (closed)
position, 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.
JB2
Position 1&2 = Line Shield and FRGND Connected
Position 2&3 = Line Shield and FRGND Not Connected
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.
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 (closed) position, this strap links DB-25 pin 7
(Signal Ground) and frame ground. In the open (disconnected)
position, pin 1 is "lifted" from frame ground.
JB4
Position 1&2 = SGND (pin 7) and FRGND Connected
Position 2&3 = SGND (Pin 7) and FRGND Not Connected
9
10
INTERFACE CARD STRAP SUMMARY TABLE #1
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*
Summary of strap settings, * indicates factory default
3.3.2 RJ-45/RJ-11 & RJ-45/RJ-45 STRAP SETTINGS
Figure 8 (below) shows strap locations for the Model 1000RM1D11
(RJ-45/RJ-11) and the Model 1000RM1D45 (RJ-45/RJ-45) rear cards.
These straps determine various grounding characteristics for the RS-
232 and twisted pair lines.
The table below provides an overview of strap functions for the
modular/modular cards. Following the table is a detailed description of
each strap's function.
Line Shield & FRGND (JB2)
This strap pertains to the line interface. In the connected (closed)
position, 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 frame
ground.
JB2
Position 1&2 = Line Shield and FRGND Connected
Position 2&3 = Line Shield and FRGND Not Connected
Figure 8.
RJ-45/RJ-11 & RJ-45/RJ-45 strap locations
JB2
(peg 1 on left)
JB6
(peg 1 on top)
JB5
(peg 1 on left)
INTERFACE CARD STRAP SUMMARY TABLE #2
Strap
Function
Position 1&2
Position 2&3
JB2
Line Shield & FRGND
Connected
Open*
JB5
SGND & FRGND
Connected
Open*
JB6
DTE Pin 2
DSR*
Not Available
Summary of strap settings, * indicates factory default
