7
CHAPTER 2
Installation and Operation
Mechanical Installation
The Model SAP612 mounts into a standard 19-inch rack and occupies one rack unit of height (1.72 inches).
Electrical Installation
Power
NOTE: Most TW user stations are powered from channel one, which is called a “wet” channel because it carries the DC
current in addition to the channel 1 audio. Channel 2 is a “dry” channel because it carries audio only. It is
important to remember this, since it can have an effect on channel assignment later.
Using TW Power Supplies
Connect TW power supplies (such as the RTS Models PS8 or PS15) to the CH 1-6 INPUT jacks on the back of the SAP612.
One to three power supplies may be connected. Using more than one power supply not only increases the system capacity, but
also offers more flexibility in channel assignment. The PS8 and PS15 supply power on channel one, or pin 2, of the output
connectors. Therefore, if only one power supply is used, all externally powered user stations must have channel one assigned
to the single powered buss. For example, if one PS8 is connected to the CH 1-2 INPUT, all externally powered stations must
have channel one permanently assigned to buss 1 on the front panel. Connecting an additional PS8 to the CH 3-4 INPUT
would permit channel one assignment to either use buss1 or buss 3. Using three (3) PS8s would permit buss 1, 3, or 5 to be
used for channel one assignment. Since TW power supplies are equipped with termination resistors, set the termination
switches on the rear panel of the SAP612 to the External position (switch out).
Using Other Power Sources (Figure 3 on page 8).
TW systems require 18-35 volts DC (32 volts nominal). The power source must provide adequate filtering so as not to
introduce noise into the system. Connect the external power supply ground lead to pin 1 of the CH1-2 INPUT connector;
connect the positive lead to pin 2. Set all termination switches to the Internal (switch in) position. In this application, buss 1 is
used to supply power only and cannot be used as an intercom buss. Channel 1 of all externally powered user stations must be
assigned to buss 1.
(28 pages)
(31 pages)
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