Control Data Australia Memories compiled by Brian Membrey

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New Data Transmission Service In World Class

Statement By the Postmaster-General, The Hon. Sir Alan Hulme

EMBARGO FOR PRESS : NOT FOR PUBLICATION OR BROADCAST BEFORE 10 p,m. SUNDAY, MAY 30, 1971

“The Australian Post Office will join a select group of world telecommunications authorities when its first 40,800 hits per second (B.P.S) data transmission service between Melbourne and Sydney goes into operation on June l.

The Postmaster-General, Sir Alan Hulme announced today that the service, believed to be the first of it’s type to be installed in the Southern Hemisphere, would operate in each direction between computers in the Melbourne and North Sydney premises of Control Data Australia Pty. Ltd,

Sir Alan said that transmission of data at 40,800 B.P.S, was made possible By the use of a wide-band circuit equivalent to 12 individual trunk link telephone channels (48 KHZ bandwidth), instead of a single channel.

Until now, the Post Office, through its DATEL service, has used individual telephone circuits to enable data to be sent Between remote terminals and computers at speeds of 200, 600, 1200 or 2400 B.P.S.

Sir Alan said the service was preceded by considerable investigation and special testing on existing facilities to select the best possible circuits. Provision of the service included the use of high quality cable across the Sydney Harbour Bridge from the Sydney Trunk Exchange to Control Data's premises and in Melbourne, high quality cable links to their St. Kilda Road premises.

The Minister added that a recent survey of computer houses and large computer customers in Australia revealed that there would be a small but steady demand for other data services at 40,800 B.P.S. and that plans were being made to meet this demand.

He said the Post Office was proud of the service to be introduced on June 1, and felt that it would be beneficial to computer houses and large companies.

CANBERRA May 28. 1971 - P. M.


What The Oz Said - or perhaps re-hashed (1 June, 1971)

High Speed data run

The first 40,800 bits per second (BPS) data transmission service between Melbourne and Sydney goes into operation today.

It is believed to be the first of its type installed in the southern hemisphere.

The service will operate in each direction between Control Data Australia Pty Ltd's 3300 computer in Melbourne and the company's $6 million 6600 in Sydney.

In an official statement yesterday, the Postmaster-General, Sir Alan Hulme, said that transmission of data at 40,800 BPS was made possible because of a wide-band circuit equivalent to 12 individual trunk line telephone channels (48KHz band-width) instead of a single channel.

Until now, the Post Office, through its DATEL service has used individual telephone circuits to enable data to be sent between remote terminals at speed of 200, 600, 1200 or 2400 B.P.S.

Sir Alan said that a recent survey of computer houses and large computer customers in Australia revealed that there would be a small but steady demand for other data services at 40,800 BPS and that plans were being made to meet this demand.

A Control Data spokesman said yesterday the wide-band line would expand the number of terminals which can be handled in Melbourne to between 20 and 25 and would greatly reduce line costs for Melbourne terminal users.

These users will pay no more for their line costs than Sydney users, as the costs will involve only those lines hooked up to the multiplexor at the 3300 installation.

Control Data is paying the Post Office about $130,000 per year for the wide-band line.

At present, there are three terminals in Melbourne – two public and one private – linked to the 6600 in Sydney.