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
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EOBS pages 262-267.
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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
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"The 4A Toll System Grows", BLR 31:9 Sep 1953 pgs 366-367.
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"The 4A Crossbar Toll System for Nationwide Dialing", BLR 31:10 Oct
1953 pgs 369-374.
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"Common-Control Features In Nationwide Dialing", BLR 31:12 Dec 1953
pgs 481-485.
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"Sequence Charts for Switching Circuits", BLR 31:12 Dec 1953 pgs
492-496.
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"Automatic Alternate Routing of Telephone Traffic", BLR 32:2 Feb 1954
pgs 51-57.
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"Detached Contact Schematics", BLR 32:7 Jul 1954 pgs 261-266.
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"Senders for the 4A Toll System", BLR 32:8 Aug 1954 pgs 295-300.
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"Measuring Telephone Traffic", BLR 32:9 Sep 1954 pgs 326-329.
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"Decoders and Markers in 4A Toll Crossbar", BLR 32:11 Nov 1954 pgs
431-435.
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"Switching At Its Boldest", BLR 32:12 Dec 1954 pgs 441-445.
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"Connectors in 4A Toll Crossbar", BLR 33:2 Feb 1955 pgs 65-69.
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"Operation of the Card Translator", BLR 33:3 Mar 1955 pgs 93-97.
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"Automatic Alternate Routing in the 4A Crossbar System", BLR 33:4 Apr
1955 pgs 141-145.
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"Traffic Registers in 4A Toll Crossbar", BLR 33:4 Apr 1955 pgs
149-151.
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"Card Translator Equipment", BLR 33:5 May 1955 pgs 178-181.
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"Converting Toll Crossbar Offices for Nationwide Dialing", BLR 33:5
May 1955 pgs 188-192.
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"Transistors in the 4A Crossbar System", BLR 33:6 Jun 1955 pgs
215-219.
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"Traffic Load Control in Toll Crossbar Systems", BLR 33:7 Jul 1955 pgs
256-259.
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"The Translator Card in Toll Crossbar", BLR 33:8 Aug 1955 pgs 294-298.
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"'Two-Train' Switching in Toll Crossbar Offices", BLR 33:10 Oct 1955
pgs 394-397.
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"Coding Tool for Translator Cards", BLR 35:2 Feb 1957 pgs 53-56.
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"4A and 4M Toll Crossbar with CAMA Equipment", BLR 37:9 Sep 1959 pgs
345-349.
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"No. 4 CAMA and the 'Bylink' Circuit", BLR 37:10 Oct 1959 pgs 387-389.
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"New Dial-Pulse Register for No. 4-Type CAMA", BLR 37:11 Nov 1959 pgs
422-424.
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"4A and 4M CAMA: Trunk Class Translator", BLR 38:6 Jun 1960 pgs
221-223.
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"4A and 4M CAMA: Routing Arrangements", BLR 38:7 Jul 1960 pgs 266-268.
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"Test Circuits for Toll Crossbar", BLR 38:11 Nov 1960 pgs 424-427.
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"Increased Traffic Capacity for 4A and 4M Switching Systems", BLR
42:10 Nov 1964 pgs 375-379.
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"Cost Reduction for Four-Wire Toll Crossbar Systems", BLR 43:11 Dec
1965 pgs 454-456.
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"Automatically Controlling Heavy Telephone Traffic", BLR 44:4 Apr 1966
pgs 135-138.
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"DDD + ETS = Fast Long-Distance Calling", BLR 47:10 Nov 1969 pg 335.
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"The Piggyback Twistor Store", BLR 47:11 Dec 1969 pgs 359-364.
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"Electronic Translator System for Toll Switching - Routing Strategy and
Network Control", IEEE Transactions on Communications Technology 18:3 Jun 1970
pgs 175-181.
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"4A Toll Crossbar - Keeping a System Young", BLR 48:8 Sep 1970 pgs
239-244.
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"A Decade of ESS", BLR 48:11 Dec 1970 pgs 318-325.
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"The Network: Forging Nationwide Telephone Links", BLR 53:1 Jan 1975
pgs 4-15.
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"Keeping No. 4 Crossbar Young and Responsive", BLR 53:10 Nov 1975 pgs
409-415.
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"New 4A Trunk Circuits Save Space and Power", BLR 55:2 Feb 1977 pgs
50-54.
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"CCIS: 4A Toll Crossbar Application", BSTJ 57:2 Feb 1978 pgs 283-323.
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"CCIS Implementation Enhanced by No. 4A Crossbar", BLR 56:5 May 1978
pgs 132-137.
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"International Dialing: No Longer a Novelty", BLR 57:1 Jan 1979 pgs
26-31.