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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. Power entry module - Wikipedia

   en.wikipedia.org/wiki/Power_entry_module

   A simple power entry module, the rectangular device below a red power switch in the photograph. This example consists of an IEC 60320 C14 inlet connector and fuse holder. . The fuse is protected by a sliding plastic cover, which requires the power lead to be removed before it can be open

4. 1A2 Key Telephone System - Wikipedia

   en.wikipedia.org/wiki/1A2_Key_Telephone_System

   The features were provided on a line-by-line basis by the selection of particular Key Telephone Units (KTUs) plugged into a pre-wired backplane in the central control unit. Optional components of the 1A2 could also provide a function called 'I-Hold,' where a call could only be retrieved off hold at the phone that originally placed the line in ...

5. 66 block - Wikipedia

   en.wikipedia.org/wiki/66_block

   A split-50 M-type 66 block with bridging clips attached. A 66 block is a type of punch-down block used to connect sets of wires in a telephone system. They have been manufactured in four common configurations, A, B, E and M. [a] A and B styles have the clip rows on 0.25" centers while E and M have the clip rows on 0.20" centers.

6. 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.

7. Panel switch - Wikipedia

   en.wikipedia.org/wiki/Panel_switch

   The panel switch is an example of a power drive system, in that it used 1/16 horsepower motors to drive the selectors vertically to hunt for the desired connection, and back down again when the call was completed. In contrast, Strowger or crossbar systems used individual electromagnets for operation, and in their case the power available from ...