An inquiry into the size and configuration of the market for overseas telecommunications services in 1970. The total capacity requirement for routes involving the United States is estimated at 55 to 70 percent of the figure given by the 1961 ad hoc Carrier Committee. But the main difference between these two forecasts lies in the estimates given for certain bulk routes, which in some cases run as low as 25 to 40 percent of the committee's estimate. Most of the capacity requirement on overseas routes in 1970 will derive from demand for telephone service; the effective demand for overseas television transmission will probably be limited to certain off-peak hours. Submarine cable systems will supply a substantial portion of the anticipated requirements; but, for various reasons, a communication satellite system designed to meet the needs of 1970 is likely to need substantial multiple access capabilities.