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PSTN Central Unit 2.1
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Direct PSTN Connection
This is the simplest and most reliable type of connection. High operational costs (flat
rate costs) are a drawback of this solution.
Telephone line requirements

No double or group serial line.

The telephone socket including cabling is a property of the telecom company
and may not be tampered with.
Other recommendations

Notify the telephone network provider of your LN installation and submit
certification upon request.

Your follow-up cabling has to meet all applicable safety regulations.

You are recommended to secure your cabling physically against piracy (with a
telephone lock, e.g.).
PBX Connection
This is the least-cost solution where a PBX and an unused PBX line are available.
PBX line requirements

The PBX to be used must work reliably even in the case of power outage.
Large PBXs are mostly equipped with a back-up power supply, smaller PBXs
usually use PSTN line redirection in the event of power failure. Consult the
problem with the technician responsible for your PBX. An error during power
outage may result in LN calling an undesired station.

Relevant call access rights have to be assigned to the PBX line to be used (use
a standard telephone set to check whether the line can make calls to all
required „external”/CO line numbers).

While programming, enter all necessary PSTN prefixes (typically a zero), or
(which is a better solution) make the PBX not require a prefix (so-called
automatic CO line seizure).

To make dispatching office–lift calls, you have to know the extension number
and how to get through to it (dial-in, DISA, operator).

The dispatching office–lift connection may not depend on the operator’s
presence, no call redirection to a fax machine in the night mode is allowed,
etc.
Other recommendations
Make an agreement with the PBX owner regarding operating costs (LN outgoing calls
are billed at the owner‘s expense with the exception of free calls on “green lines”).
Tip

Where a non-stop security or porter’s service is available, the personnel
can be trained in rescue operations and LN can be programmed to call this
service.