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MP500/4N-8-16 Installation
5.12.8.2
Connecting the PSTN telephone line to the ILT500-N interface
The diagram below illustrates how the PSTN telephone line must be connected to the ILT500-N interface.
Figure 62 - Telephone connections
The control panel must be the first device connected to the incoming telephone line (all the other potential devices - fax, answering
machine, and telephones - must be downstream from the control panel).
This type of connection guarantees that, if needed, the control panel can always engage the telephone line, excluding all the other
devices connected if necessary.
Handle the twin telephone line carefully, as it may be live from the telephone control panel power supply.
When connecting the twin telephone line to the LA and LB terminals of the interface, it is not necessary to take polarity into account.
The ILT500-N board has a yellow LED to indicate if the telephone line is engaged.
The telephone interface must be grounded. The MP500/16 control panel comes with a cable for the earth that must be inserted in a
Faston terminal on the wall where the box is located (
C
).
If there should be high risk of electrical shock on the telephone line in the work area, it is advisable to install supplementary protection
(not provided) on upstream of the control panel on the telephone line.
