Telex MCE325 manual Jumper Number Jumper Function Default Setting

2When a two-wire line is connected to channel one and a four-wire line is connected to channel B.

For all other intercom line configurations that use two-wire lines, DS3 must be set to the “on” position for four-channel operation.

Table 2.2 Jumper functions and default settings.

Jumper Number	Jumper Function	Default Setting
J4	Assigns PROGRAM A input to two-wire CH 3 or four-wire CH B.	Not assigned
	Not assigned: pins 2 & 3 shorted.
	Assigned: pins 1 & 2 shorted (IFB to CH 3).
J5	Assigns PROGRAM B input to two-wire CH 4.	Not assigned
	Not assigned: pins 2 & 3 shorted.
	Assigned: pins 1 & 2 shorted (IFB to CH 4).
J6	Selects two-wire CH1 and CH 2, or four-wire CH A output. (See J19	Two-wire operation
	for CH A input.)
	CH1 and CH 2 selected: pins 2 & 3 shorted.
	Four-wire CH A output selected: pins 1 & 2 shorted.
J7	Selects two-wire CH 3 and CH 4, or four-wire CH B output. (See J20	Two-wire operation
	for Ch B input.)
	CH 3 and CH 4 selected: pins 2 & 3 shorted.
	Four-wire CH B output selected: pins 1 & 2 shorted.
J16	Assigns mono mix of the PROGRAM A and B inputs to the left	Assigned
	headphone.
	Not assigned: pins 2 & 3 shorted.
	Assigned: pins 1 & 2 shorted.
J17	Assigns mono mix of the PROGRAM A and B inputs to the right	Assigned
	headphone.
	Not assigned: pins 2 & 3 shorted.
	Assigned: pins 1 & 2 shorted.
J18	Assigns mono mix of the PROGRAM A and B inputs to the speaker.	Assigned
	Not assigned: pins 2 & 3 shorted.
	Assigned: pins 1 & 2 shorted.
J19	Selects four-wire CH A input. Off (not used): pins 2 & 3 shorted.*	Off
	On when LISTEN 1 button is on: pins 1 & 2 shorted.
	Always on: pins 3 & 4 shorted.
J20	Selects four-wire CH B input. Off (not used): pins 2 & 3 shorted.*	Off
	On when LISTEN 2 button is on: pins 1 & 2 shorted.
	Always on: pins 3 & 4 shorted.
J24	Selects unbalanced or balanced dynamic mic input.	Unbalanced mic input
	Unbalanced: pins 2 & 3 shorted.
	Balanced: pins 1 & 2 shorted.

NOTE *J19 and J20 jumpers should be in “off” positions when two-wire lines are used.

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