RTS SSA-424A manual Internal Access, Mode Dip Switch Settings, Mode DIP Switch Settings

Appendix A

Internal Access

1.Remove six screws from the back cover.

2.Remove the top cover.

This provides access to all internal adjustments.

3.For option card installation, slide the circuit board out toward the back to remove it from the bottom cover.

AUX	Telex Communications, Inc., Made in U.S.A.			AUX	J5 POWER
					+5V 3A
					+15V	1.6A
					-15V 0.3A
J4B				J4A
				+5V		RTN
	J1B	J1A		+15V		-15V
J3B	J2B	2 WIRE SYSTEM	J2A	J3A	RTN
4 WIRE SYSTEM				4 WIRE SYSTEM

FIGURE 1. Location of screws for disassembly.

Mode Dip Switch Settings

S301 controls the operating mode for System B and S302 controls the operating mode for System A.

Settings are summarized as follows:

TABLE 1. Mode DIP Switch Settings

	Switch Settings			Description
1	2	3	4
Open	Open	Open	Open	Configuration 1,
				Full-Duplex Mode
				(Default)
Closed	Open	Open	Open	Configuration 2,
				Half-Duplex Mode
Open	Open	Open	Closed	Tone Test Mode

Full-Duplex Definition: Both sides of the line can talk simultaneously.

Half-Duplex Definition: Only one side of the line can talk at a time and the other side must wait until the first side is done talking before responding. 4-wire systems have priority over 2-wire system in Half-duplex mode.

Tone Test Mode: Disables internal suppression of tones.

FIGURE 2. Locations of internal controls

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