AT&T No. 4 Crossbar Switching System (4XB), No. 4A Crossbar Switching System (4AXB), and No. 4A Electronic Translator System (4AETS)

(last updated: 16-May-2015 09:31)
 

Books

  1. EOBS pages 262-267.
     
  2. Engineering and Operations in the Bell System, Second Edition, R.F. Rey, Technical Editor, AT&T Bell Laboratories, 1983: pages 400, 408-409, 451-452, 454, 463.

Periodical Articles

  1. "The 4A Toll System Grows", BLR 31:9 Sep 1953 pgs 366-367.
     
  2. "The 4A Crossbar Toll System for Nationwide Dialing", BLR 31:10 Oct 1953 pgs 369-374.
     
  3. "Common-Control Features In Nationwide Dialing", BLR 31:12 Dec 1953 pgs 481-485.
     
  4. "Sequence Charts for Switching Circuits", BLR 31:12 Dec 1953 pgs 492-496.
     
  5. "Automatic Alternate Routing of Telephone Traffic", BLR 32:2 Feb 1954 pgs 51-57.
     
  6. "Detached Contact Schematics", BLR 32:7 Jul 1954 pgs 261-266.
     
  7. "Senders for the 4A Toll System", BLR 32:8 Aug 1954 pgs 295-300.
     
  8. "Measuring Telephone Traffic", BLR 32:9 Sep 1954 pgs 326-329.
     
  9. "Decoders and Markers in 4A Toll Crossbar", BLR 32:11 Nov 1954 pgs 431-435.
     
  10. "Switching At Its Boldest", BLR 32:12 Dec 1954 pgs 441-445.
     
  11. "Connectors in 4A Toll Crossbar", BLR 33:2 Feb 1955 pgs 65-69.
     
  12. "Operation of the Card Translator", BLR 33:3 Mar 1955 pgs 93-97.
     
  13. "Automatic Alternate Routing in the 4A Crossbar System", BLR 33:4 Apr 1955 pgs 141-145.
     
  14. "Traffic Registers in 4A Toll Crossbar", BLR 33:4 Apr 1955 pgs 149-151.
     
  15. "Card Translator Equipment", BLR 33:5 May 1955 pgs 178-181.
     
  16. "Converting Toll Crossbar Offices for Nationwide Dialing", BLR 33:5 May 1955 pgs 188-192.
     
  17. "Transistors in the 4A Crossbar System", BLR 33:6 Jun 1955 pgs 215-219.
     
  18. "Traffic Load Control in Toll Crossbar Systems", BLR 33:7 Jul 1955 pgs 256-259.
     
  19. "The Translator Card in Toll Crossbar", BLR 33:8 Aug 1955 pgs 294-298.
     
  20. "'Two-Train' Switching in Toll Crossbar Offices", BLR 33:10 Oct 1955 pgs 394-397.
     
  21. "Coding Tool for Translator Cards", BLR 35:2 Feb 1957 pgs 53-56.
     
  22. "4A and 4M Toll Crossbar with CAMA Equipment", BLR 37:9 Sep 1959 pgs 345-349.
     
  23. "No. 4 CAMA and the 'Bylink' Circuit", BLR 37:10 Oct 1959 pgs 387-389.
     
  24. "New Dial-Pulse Register for No. 4-Type CAMA", BLR 37:11 Nov 1959 pgs 422-424.
     
  25. "4A and 4M CAMA: Trunk Class Translator", BLR 38:6 Jun 1960 pgs 221-223.
     
  26. "4A and 4M CAMA: Routing Arrangements", BLR 38:7 Jul 1960 pgs 266-268.
     
  27. "Test Circuits for Toll Crossbar", BLR 38:11 Nov 1960 pgs 424-427.
     
  28. "Increased Traffic Capacity for 4A and 4M Switching Systems", BLR 42:10 Nov 1964 pgs 375-379.
     
  29. "Cost Reduction for Four-Wire Toll Crossbar Systems", BLR 43:11 Dec 1965 pgs 454-456.
     
  30. "Automatically Controlling Heavy Telephone Traffic", BLR 44:4 Apr 1966 pgs 135-138.
     
  31. "DDD + ETS = Fast Long-Distance Calling", BLR 47:10 Nov 1969 pg 335.
     
  32. "The Piggyback Twistor Store", BLR 47:11 Dec 1969 pgs 359-364.
     
  33. "Electronic Translator System for Toll Switching - Routing Strategy and Network Control", IEEE Transactions on Communications Technology 18:3 Jun 1970 pgs 175-181.
     
  34. "4A Toll Crossbar - Keeping a System Young", BLR 48:8 Sep 1970 pgs 239-244.
     
  35. "A Decade of ESS", BLR 48:11 Dec 1970 pgs 318-325.
     
  36. "The Network: Forging Nationwide Telephone Links", BLR 53:1 Jan 1975 pgs 4-15.
     
  37. "Keeping No. 4 Crossbar Young and Responsive", BLR 53:10 Nov 1975 pgs 409-415.
     
  38. "New 4A Trunk Circuits Save Space and Power", BLR 55:2 Feb 1977 pgs 50-54.
     
  39. "CCIS: 4A Toll Crossbar Application", BSTJ 57:2 Feb 1978 pgs 283-323.
     
  40. "CCIS Implementation Enhanced by No. 4A Crossbar", BLR 56:5 May 1978 pgs 132-137.
     
  41. "International Dialing: No Longer a Novelty", BLR 57:1 Jan 1979 pgs 26-31.