JB2
Position 1&2 = Line A Shield Connected to Frame Ground
Position 2&3 = No Shield
JB4
Position 1&2 = Line B Shield Connected to Frame Ground
Position 2&3 = No Shield
SGND & FRGND (JB5)
In position 1&2, this strap links signal ground and frame ground
through a 100 Ohm, 1/2 W resistor. In position 2&3, pin 1 is “not
connected to frame ground.
JB5
Position 1&2 = SGND and FRGND Connected
Position 2&3 = SGND and FRGND Not Connected
DTE as DSR or RI (JB6 & JB7)
Because the Model 222NRC uses DSR (but not RI), only position
1&2 is valid when this rear card is used with the Model 222NRC.
Position 1&2 causes the terminal (DTE) to see DSR when the Model
222NRC is powered up properly. Position 2&3 is for Ring Indicate,
which is non-functional on the Model 222NRC. Furthermore, use of
position 2&3 will cause DSR to float, which will lead to improper
operation of the Model 222NRC.
JB6 & JB7
Position 1&2 = DSR
Position 2&3 = (Ring Indicate) Not Valid for Model 222NRC
4.0 INSTALLATION
This section describes the functions of the Model 222NR16P rack
chassis, tells how to install front and rear Model 222NRC cards into the
chassis and provides diagrams for wiring up the interface connections
correctly.
4.1 THE MODEL 222NR16P RACK CHASSIS
The 1000R16P Rack Chassis (shown in Figure 7, below) has
sixteen short range modem card slots, plus its own power supply.
Measuring only 3.5" high, the 100016RP is designed to occupy only 2U
in a 19" rack. Sturdy front handles allow the 1000R16P to be extracted
and transported conveniently.
4.1.1 THE RACK POWER SUPPLY
The power supply included in the Model 1000R16P 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 spring loaded thumb screws and the
rear card by conventional metal screws.
8
7
Figure 7. Model 1000R16P Rack Chassis with Power Supply
WARNING!
There are no user-serviceable parts in the
power supply section of the Model 222NRC. 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.
