Abstract
To introduce Common Channel Interoffice Signaling (CCIS) into the toll network as rapidly and economically as possible, a great deal of planning had to be done. An analysis was performed to determine which 4A-ETS (Electronic Translation System) offices should be converted to CCIS and the order of this conversion. Practical feasibility constraints also had to be considered. This analysis was followed by coordination with AT&T and the operating companies which resulted in a plan to convert about thirty 4A-ETS switching offices per year to CCIS in 1977, 1978, and 1979. In addition, all No. 4 ESS offices are CCIS-equipped and No. 1 (A) ESS will be CCIS-equipped by 1978. The result is that by 1980 more than a hundred toll offices will have CCIS capability.
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