Topical Terminology > S Interface
1 Definition
S Interface
For S Interface we have a term and definition in Telco.
S Interface (Telco) 
The electrical interface between the NT-1 and the Terminal Adapter or other ISDN equipment. ISDN equipment with built-in NT1s do not necessarily provide access to the S interface (the Zephyr, ZephyrExpress and Telos TWO do). Multiple devices can share an NT-1 by connecting on the S interface. Also known as the S passive bus.
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