Patton electronic 1140RC HOW the Jumper Works, DTE Shield Pin 1 & Frgnd JB1, Rack Power Supply

3.2.1 HOW THE JUMPER WORKS

Figure 4 (below) shows the 3-pin jumpers used on the rear card. The strap enables or disables a particular function depending upon whether it straddles pins 1 and 2, or pins 2 and 3.

1 2 3 1 2 3 1 2 3

Figure 4. Orientation of interface card strap

DTE Shield (Pin 1) & FRGND (JB1)

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.

JB1

Position 1&2 = DTE Shield (Pin 1) and FRGND connected Position 2&3 = DTE Shield (Pin 1) 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 1140RC cards into the chassis, and provides instructions for connecting the interface cables.

4.1 THE MODEL 1000R16 RACK CHASSIS

The 1000R16 Rack Chassis (Figure 5, below) has sixteen short range modem card slots, plus its own power supply. Measuring only 3.5” high, the 1000R16 is designed to occupy only 2U in a 19” rack.

Sturdy front handles allow the 1000R16 to be extracted and transported conveniently.

Figure 5. Model 1000R16 rack chassis with power supply

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.

WARNING! There are no user-serviceable parts in the power supply section of the Model 1140RC. Voltage setting changes and fuse replacement should only be performed by qualified service personnel. Contact Patton Electronics Technical support at (301) 975-1007, http://www.patton.com, or support@patton.com for more information.

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