As one starting point, A. H. Freeman undertook a comprehensive review of the development of switching technology and strategies in Australia working through from the commencement of the telephone service last century to the late nineteen seventies. His quite extensive papers are now in Telecom records and have been extensively used as a source.

There were a number of contributions concerning Telecom Research Laboratories, but I am particularly indebted to H. S. Wragge, the present Director, and his immediate predecessor, E. Sandbach, who also provided valuable information on the development of the Radio Research Board.

J. Sinnott and L. Vaux were particularly important sources of information on transmission matters, while on international communications J. Phillips, G. Kennedy, K. Reid and P. Kerkin were most helpful. Many details relating to developments in broadcasting technology were supplied by L. Sebire.

Amongst the host of others who assisted were P. Wion, P. Higgins, L. Cunningham, E. Amerasekara, L. Derrick, L. Smith, J. Moynihan, J. Wilson and J. N. Almgren. Many of the illustrations from Telecom were supplied by L. Mahr while G. Todd researched library records for many of the references. The Victoria Museum kindly gave permission for the use of the message stick illustration, and Olex, STC and L. M. Ericsson provided valuable originals. The OTC illustration was arranged by P. Muir. E. R. Banks and E. A. George each read portions of the draft and made valuable suggestions. Finally, Mrs Phyllis Jolly undertook the word processor work, in the process interpreting a barely legible hand-writing and remaining philosophical when earlier drafts were largely abandoned in favour of more concise ones.

Part 2 has been completed by Dr. T. Pearcey with some assistance from Professors J. Bennett and M. W. Allen.

Abbreviations
Additional to those explained in the text.

AEC	Automatic Electric Company
ANU	Australian National University
APO	Australian Post Office
AT&T	American Telephone and Telegraphic Company
BPO	British Post Office
CBD	Central Business District
CRO	Cathode Ray Oscilloscope
CCITT	International Consultative Committee for Telephony and Telegraphy
dB	Decibel
DC	Direct Current
ELSA	Extended Local Service Area
FDM	Frequency Division Multiplexing
HF	High Frequency
ITT	International Telephone & Telegraph Co.
kHz	Kilohertz
LSI	Large Scale Integration
MF	Medium Frequency
MFC	Multi Frequency Code
PABX	Private Automatic Branch Exchange
PSTN	Public Switched Telephone Network
RAX	Rural Automatic Exchange
REMO	Register Modification Programme
SCDC	Single Communication Direct Current
SPC	Stored Programme Control
TEI	Telephone & Electrical Industries
UHF	Ultra High Frequency
VHF	Very High Frequency

Codes
As much Australian Telecommunications Technology is based on overseas designs, many items of equipment are known by codes derived from other languages. Thus many have no simple English equivalent while some are hybrid, reflecting a degree of local design. Amongst the more important used in this chapter are:

AFG	Cordless Trunk Operating Board
ARF 101	Crossbar Subscribers Exchange with DC signalling
ARF 102	Crossbar Subscribers Exchange with Multi-frequency code signalling
ARM 20	Large Crossbar Trunk Exchange
ARM 50	Small Crossbar Trunk Exchange
ARK M	Small Country Crossbar Exchange with multifrequency code signalling
ARK D	Small Country Crossbar Exchange with decadic signalling
ARK 523	Small Minor Switching Centre
FIR	Incoming Relay Set
FUR	outgoing Relay Set
GV	Group Selector
LKR	Terminating Relay in Local Exchange
Reg	Register. Numerous designs for a range of functions and designated by subscripts such as L, I, U, H4, - - -
Reg E	Register with extended functions
Reg M & Reg P	May be interpreted as Register for Metropolitan and Provincial Networks respectively
SL	Subscribers Switching Stage
SR	Originating Relay

Australian Academy of Technological Sciences and Engineering