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SGND & FRGND (JB4)
In the connected position, this strap links DB-25 pin 7 (Signal
Ground) and frame ground. In the open 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
3.3.2 Model 1000RCM13448 Strap Settings
Figure 8 shows the strap location for the Model 1000RCM13448
(M/34/RJ-48S) rear card. This strap determines whether Signal Ground
and Frame Ground will be connected.
SGND & FRGND (JB4)
In the connected position, this strap links Signal Ground and frame
ground.
JB4
Position 1&2 = SGND and FRGND Connected
Position 2&3 = SGND and FRGND Not Connected
4.0 INSTALLATION
This section describes the functions of the Model 1000R16 rack
chassis, tells how to install front and rear Model 2500RC Series cards
into the chassis, and provides diagrams for wiring the interface
connections correctly.
4.1 THE MODEL 1000R16 RACK CHASSIS
The Model 1000R16 Rack Chassis (Figure 9, below) has sixteen
short range modem card slots, plus its own power supply. Measuring
only 3.5” high, the Model 1000R16 is designed to occupy only 2U in a
19” rack. Sturdy front handles allow the Model 1000R16 to be
extracted and transported conveniently.
4.1.1 The Rack Power Supply
The power supply included in the Model 1000R16 rack uses the
same mid-plane architecture as the modem cards. The front card of
the power supply slides in from the front, and the rear card slides in
from the rear. They plug into one another in the middle of the rack.
The front card is then secured by thumb screws and the rear card by
conventional metal screws.
(continued)
Figure 9. Model 1000R16 Rack Chassis with power supply
WARNING! There are no user-serviceable parts in the
power supply section of the Model 2500RC Series.
Voltage setting changes and fuse replacement should only
be performed by qualified service personnel. Contact
Patton Electronics Technical support at (301)975-1007 for
more information.
Figure 8. M/34/RJ-48 strap locations
JB4
(peg 1 on left)