Siemens SANTIS-ab User Manual page 7

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Connection of the terminal equipments:
The sockets for the analog equipments (e.g. telephones, gr.2/3
fax machines, modems) are designated with «a/b1» and
«a/b2», those for the ISDN terminal equipments with «S»
(e.g. ISDN-telephones, PC with ISDN-card, gr.4 fax
machines). See figure on page 2.
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