IT Baseline Protection Manual - The Information Warfare Site

Safeguard Catalogue Infrastucture Remarks
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S 1.5 Galvanic separation of external lines
Initiation responsibility: Head of Site/Bldg Technical Service
Implementation responsibility: Site/Bldg Technical Service
Many in-house networks have a direct galvanic connection to external lines.
This may be the case with telephone lines, power supply, data networks with
remote data transmission connections, but also with gas and water supplies.
Through these mains connections, external voltage and overvoltage can be
imported into the building. There are a number of electric, electronic or
software-based measures which can protect networks against external factors.
However, absolutely reliable protection cannot be guaranteed in all cases.
Systematic galvanic separation of outside lines at the entry points into the
building is then the last resort. This can be done, for instance, by installing a
switch which will connect the line only when required (remote maintenance).
For the protection of inseparable lines (telephone, data, power, gas, water)
against overvoltage, consideration should be given to installing an overvoltage
protection device (c.f. S 1.25 Overvoltage protection).
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IT-Baseline Protection Manual: Oktober 2000