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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]
The T1 line consists of 23 bearer (B) channels and one data (D) channel for control purposes, [1] for a total bandwidth of 24x64-kbit/s or 1.544 Mbit/s. The E1 carrier provides 30 B- and one D-channel for a bandwidth of 2.048 Mbit/s. [ 2 ]
EPABX (Electronic Private Automatic Branch Exchange) EPABX is an electronic device used in Offices, Hotels, Industries and many other places for voice communication. It is independent and can work with out any trunk lines (service providers) The main features offered by any EPABX system are: 1. Call transfer 2. Call pick up 3. Call back up 4.
The No. 1 Electronic Switching System Arranged with Data Features (No. 1 ESS ADF) was an adaptation of the Number One Electronic Switching System to create a store and forward message switching system. It used both single and multi-station lines for transmitting teletypewriter and data messages. It was created to respond to a growing need for ...
TSW2 Expanded unit with growth to ~1200 lines; TSW3 Jumbo unit with growth to system recommended maximums; TSD (toll switch) [31] AN/TTC-20 568 Line Military Fixed Switch (Used by US Air Force - only one was known in existence at Sembach AB, Germany) (retired) AN/TTC-30 568 Line Military Tactical Mobile Switch (Used by US Army and Air Force ...
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The party line letters W, R, J, and M were only used in manual exchanges with jack-per-line party lines. Montreal telephone exchange ( c. 1895 ) In contrast to the listing format MAin 1234 for an automated office with two capital letters, a manual office, having listings such as Hillside 834 or East 23, was recognizable by the format in which ...