1A Hear it!

1A Telecom Definition
The first key telephone system (KTS), the 1A was a hardwired system comprising components physically wired together by hand. Developed by the Bell System and first marketed in 1938, the 1A was an electromechanical system. See also 1A1, 1A2, and KTS.

Browse dictionary entries near 1A

  1. ‹ 18-wheeler
  2. ‹ 18 mo
  3. ‹ 16-QPSK
  4. ‹ 16-QAM
  5. ‹ 1394
  6. ‹ 12b-1 fees
  7. ‹ 128-QAM
  8. ‹ 12-step
  9. ‹ 1116 Form
  10. ‹ 10XXX
  1. 1A1 ›
  2. 1A2 ›
  3. 1b ›
  4. 1B+D ›
  5. 1Base5 ›
  6. 1G ›
  7. 1Q ›
  8. 1xEV-DO ›
  9. 1xRTT ›
  10. 2 ›