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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Telex MCE325 manual Jumper Number Jumper Function Default Setting

MCE325 specifications

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