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2. List of telephone switches - Wikipedia

   en.wikipedia.org/wiki/List_of_telephone_switches

   EMS-1 (The ITEC Electronic Modular Switch is an electronic direct control switching system. The modules are combined to form a complete switch or any of the modules can be added to your present Step-by-Step Systems.) EMS-2 (The EMS-2 RURAL SWITCH is a stored program control analog switch designed to be cost-effective in small exchanges.

3. Nortel Meridian - Wikipedia

   en.wikipedia.org/wiki/Nortel_Meridian

   In the early 1970s, most PBXs were either electromechanical (e.g. cross-bar) or based on a hybrid technology (e.g. switching matrix made from a two-dimensional array of contacts but control performed by an electronic logic). For this reason, the SL-1 enjoyed a great success on the enterprise market both in North-America and globally. [2] [3] [4]

4. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   Key was a Bell System term of art for a customer-controlled switching system [1] such as the line buttons on the phones associated with such systems. The electrical components that allow for the selection of lines and features such as hold and intercom are housed in a panel or cabinet, called the key service unit or key system unit (KSU). [2]

5. Telephone switchboard - Wikipedia

   en.wikipedia.org/wiki/Telephone_switchboard

   PBX switchboard, 1975. A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections.

6. QSIG - Wikipedia

   en.wikipedia.org/wiki/QSIG

   QSIG has two layers, called BC (basic call) and GF (generic function). QSIG BC describes how to set up calls between PBXs. QSIG GF provides supplementary services for large-scale corporate, educational, and government networks, such as line identification, call intrusion and call forwarding. Thus for a large or very distributed company that ...

7. KSU-less system - Wikipedia

   en.wikipedia.org/wiki/KSU-less_system

   A KSU-less telephone system is a type of electronic key telephone system that puts the switching circuitry inside of each individual phone. [1] This eliminates the need for a key service unit (KSU), which in traditional key systems is a centralized cabinet that contains the switching circuitry, and allows phones to be wired together in series while retaining certain advanced key system ...