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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Siemens SANTIS-ab user manual