Telex MCE325 用户手册

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The Model MCE325 is pre-wired for either 115 or 230 VAC operation, and the appropriate fuse is 
already installed. The MCE325 uses a 0.5A Slo-Blo fuse for 115 volt operation, or a 0.25A Slo-
Blo fuse for 230 volt operation. (A fused external DC source may be used instead of AC power if 
desired. (See “External DC Power Source”.)

Intercom line connectors J8 and J9 are parallel-wired for loop-through connection to other 
intercom stations. These connectors are used for connection of two-wire lines to channels one and 
two (full-duplex operation), or for connection of four-wire channel A output (channel A input is 
connected at the auxiliary connector).

Intercom line connector J10 is used for connection of two-wire lines to channels three and four 
(full-duplex operation), or for connection of four-wire channel B output (channel B input is 
connected at the auxiliary connector).

4-wire output terminations.

When four-wire outputs are used, termination resistors must be installed for proper operation. The 
output amplifiers are current sources, and the output level is determined by the terminating 

Connectors J8 and J9.

1

Common (low side of line)

2

Two-wire CH 1 or four-wire CH A high output

3

Two-wire CH 2 or four-wire CH A low output

Connection J10

1

Common (low side of line)

2

Two-wire CH 3 or four-wire CH B high output

3

Two-wire CH 4 or four-wire CH B low output