Telex BTR-300 Pin Wiring for Rear Panel Jacks, Internal Intercom Switches

Internal	Auxiliary Audio Out			Auxiliary Audio Input			Intercom Loop Thru
Switch								(both jacks)
Settings	Pin 1	Pin 2	Pin 3	Pin1	Pin 2	Pin 3	Pin 1	Pin 2	Pin 3
Telex Audio
Com	Ground	600 ohm	600 ohm	Ground	2.2K ohm	2.2K ohm	Ground	Balanced	Balanced
		Balanced	Balanced		Balanced	Balanced
RTS 2 wire	Ground	600 ohm	600 ohm	Ground	2.2K ohm	2.2K ohm	Ground	Channel	Channel
		Balanced	Balanced		Balanced	Balanced		1	2
Clearcom	Ground	600 ohm	600 ohm	Ground	2.2K ohm	2.2K ohm	Ground	Power	Audio
		Balanced	Balanced		Balanced	Balanced
4 wire	Ground	Balanced	Balanced	Ground	Balanced	Balanced	Do Not	Do Not	Do Not
		Intercom	Intercom		Intercom	Intercom	Use	Use	Use
		Out	Out		In	In

Table 3

Pin Wiring for Rear Panel Jacks

CA101 INTERCOM

4

W

I

R

E

2

W

I

R

E

LOW

HIGH

DIP SWITCH

	9
		8
		7
	6
	4
		3
	2
ON
		1

FRONT

Figure 8

Internal Intercom Switches

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