
Kirstein writes that “It (Seismic array technology or test
detection-ed) was ARPA’s original reason for placing a TIP
there. From the time ARPANET came on-stream in 1970,
ARPA wanted to bring the NORSAR array to SDAC in Wash-
ington over ARPANET. This is what justified the bulk of the
ARPA expenditure (from the Nuclear Monitoring Research
Office - NMROP on the link in the early days.) I do not know
when the extension...which did result from the extended IPTO
interest in the NMRO activity, put actual expenditure in the
IPTO budget.” (Kirstein, E-mail, October 8, 2002)
14. Important developments in satellite technology in the 1960s
and early 1970s led to the development of INTELSAT IV and
made possible the SATNET packet switching network.
Abramson and Kuo write: “In 1970 the ARPA Network came
into existence as a communications network for the sharing of
resources among a large number of computer centers. The
ARPANET and its resource sharing capabilities became feasible
because of the use of a new method of communication system
organization – called packet switching.... In April 1965, the
scope and nature of human communication was irreversibly
altered by the successful launch of INTELSAT I, the first
geosynchronous communication satellite. Since that time the
cost of information transmission over long distances has
decreased at a rate that makes even the present decrease in
information processing costs seem mild by comparison. The cost
per year of a single voice grade channel in INTELSAT I was
about $20,000 per year; that satellite had a capacity of 24 such
channels. The corresponding cost on INTELSAT IV, launched
in January 1971 was about $2,000 per year, and each
INTELSAT IV has about 5,000 channels....”
“By the beginning of 1973 the lower cost, higher channel
capacity, higher power, and small ground stations required by
new communication satellites had suggested the magnitude of
the impact these developments would make in computer-
communication networks of the future.... By the end of 1972, the
worldwide satellite communication net of INTELSAT had been
completed....” (from Preface, Norman Abramson and Franklin
F. Kuo) Computer-Communications Networks edited by
Abramson and Kuo, 1973, Englewood Cliffs, N.Y., xvii.)
15. For further elaboration see Ronda Hauben, “The Birth of the
Inter net ” http ://www. columb ia. ed u/~r h120/o the r/
birth_internet.txt and Ronda Hauben, “Open Architecture,” in
The Encyclopedia of Computers and Computer History. Raul
Rojas, Editor, Fitzroy Dearborn, Chicago, 2001, vol 2, pp. 652-
653.
Kirstein adds: “This was Kahn’s thinking, but there was
also a practical consideration. The basis of all the network itself
between 1969 and 1974 was the IMP, and this was firmly under
the control of one division of BBN. With the interest in the
Packet Radio and SATNET, any attempt to connect them was
delayed by the need to further develop the IMP to meet all its
demands. This was one very important reason why Kahn
proposed a ‘gateway’ which could be programmed by others,
freeing the programs from the stranglehold of one group. In
practice the IMPs could now be developed differently for the
different network technologies. Moreover, an important devel-
opment occurred. Shortly after, in 1975/76 when Dave Mills
(then at COMSAT) programmed the ‘fuzzballs’, to provide a
cheaper and more lightweight alternative to the BBN implemen-
tation.” (Kirstein, E-mail, July 3, 2002)
Cerf elaborates, “In this case, the fuzzballs were function-
ing as routers - handled IP switching as opposed to the IMPs.
The apples-to-apples comparison would be between fuzzballs
and the BBN Internet Gateways. I believe in fact the fuzzballs
were providing all the functionality of the IMPs and the gate-
ways by switching IP packets.” (Cerf, E-mail, April 13, 2003)
Kirstein adds that the development of the application level
relay “during this period was also a new form of interconnec-
tion” which “allowed all the British network developments to
occur independently of the U.S. ones, but traffic still to flow
easily between the networks.”
He explains that, “This was not an interconnection at the
network level, but at the application protocol level (Telnet, FTP
initially). This form of interconnection was new at the time,
(and-ed) allowed the different networks to develop quite
independently. In fact it was to exercise this new concept, that
all the traffic between the U.K. and ARPANET was justified in
the ‘70s and early ‘80s. Later in the ‘80s, this concept even
allowed the U.S. to develop Mockapetris’ Domain Name
System, while the U.K. developed the ‘Network Registration
Service’.”
“While these developments were quite different,” Kirstein
notes that, “the relay function allowed them to look to users as
a single network.... Clearly application level relays are not
adequate in performance or robustness, however, they played an
important role prior to the world agreeing that IP was the way to
go.” (See the article by V.G. Cerf and P.T. Kirstein, “Issues in
Packet Network Interconnection,” Proc IEEE 66, 11, pp 1386-
1408, November 1978. This is a special issue devoted to packet
internetworking issues.)
Kirstein adds: “In fact the original grant I had from ARPA
was to connect in two computers, the large IBM Computer at the
Rutherford Laboratory near Oxford and the CDC in London.
Both were the centre of centralised proprietary interactive and
remote job entry networks. This connection was made as one
between two networks from the beginning. It looked to
ARPANET as if IBM was directly connected as a Host, and any
ARPANET Host looked like a remote IBM device.” (Higginson,
PL, PT Kirstein and AV Stokes: “The Problems Connecting
Hosts into ARPANET via Front-end Computers,” Workshop on
Distributed Computer Systems, Darmstadt (1974). Lloyd, D and
PT Kirstein: “Alternative Approaches to the Interconnection of
Computer Networks,” London, Proc European Comp. Conf. on
Communications Networks, London, Online, 499-515 (1975))
Kirstein continues: “This was not an Internet design; this
was connections at an application level, and hence not very
rugged. However, this mechanism continued for the next 15
years, while the British NREN became quite sophisticated,
including packet switching, their version of the Domain Name
Service (Name Registration Scheme), FTP, Telnet, mail, etc. By
1990, while the links to the Internet had long gone IP, the hosts
on the British networks were running a totally different set of
protocols. While history (and the analysis we made at the time)
showed this was not the best, rugged or fast way to go, it
allowed both interconnectivity and independent development of
protocol structures to co-exist until all the bugs had been
resolved in the Internet protocols, and also commercial products
to be produced by new firms such as Cisco.” (Kirstein, E-mail,
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