a personalized history of computer communications 1950s -1970s and beyond mischa schwartz charles...
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A Personalized History of Computer Communications1950s -1970s and Beyond
Mischa Schwartz
Charles Batchelor Professor Emeritus
of Electrical Engineering
Columbia University
New York, NY 10027
1950s, 1960s
• US Defense Activity- SAGE Network, 1950s, Radar Data NIKE Zeus Data Network, AT&T Bell Labs, circa 1960 Paul Baran, Rand Corp., early 1960s, Survivable Data Networks• Commercial Data Networking: Airlines, Banks, …• Computer Time sharing Project Mac, MIT (GE Corp.), early 1960s
Commercial Data Networking, 1950s, 1960s
• Airline Reservation Systems
American Airlines, LGA, 1952
American Airlines/IBM Sabre, 1959
IBM PARS, 1961
SITA, 1964
• Banking Networks
Ex: Lloyds Bank, UK, 1966 (IBM)
Airline Reservation Systems
• PARS, 1961 on
• SITA, 1964 on
Original PARS System
SITA Network
Banking Networks
Late 1960s to mid-1970s
• Private Data Networks-
Tymnet, GE Information Services Network
• Proprietary Computer Communication Architectures (Computer Manufacturers)
Ex: IBM SNA
• ARPA, ARPAnet
Private Data Networks, late 1960s-1970s
• Time-shared capability
• Terminal-oriented
• Data processing:
Interactive, Batch processing
Ex: GE Information Services Network
TYMNET (Tymshare, Inc.)
later- Networking functions
GE Information Services Network
Centralized Hosts
TYMNET
Distributed Hosts
Virtual Routing
Computer Manufacturers, late 1960s on
•Teleprocessing Networks-
Specialized Communication Controllers
• Proprietary Communication Architectures
Ex: IBM SNA (later DNA, BNA,…)
Specialized hardware, software
Layered architecture
IBM SNA
System Network Architecture:
Layered Architecture
ARPA, ARPAnet:Formative Years
• 1962, MIT: J.C.R. Licklider, “Globally interconnected computers” Len Kleinrock, doctoral dissertation (1964, “Communication Nets: stochastic message flow and delay”, McGraw-Hill)•1965, Larry Roberts, MIT Lincoln Lab, interconnected-computer expt. Donald Davies, British NPL, “packet” message vs. packet switching
ARPA, ARPAnet: Network Concept/Development
• 1967, Roberts, ARPA: “computer utility concept” BBN contract, IMPs• 1969, 4-node ARPAnet, datagram routing (1970, Host-to-Host protocol, NCP) Measurements- “incestuous” traffic!• 1974, Robert Kahn and Vint Cerf- TCP (1978-TCP/IP) 24 node-ARPAnet• 1976, 56 nodes
International Standardization Efforts
• Early 1970s, CCITT,
public data networking
• 1976, X.25
Datapac (Canada),
first public data network
• 1978-1980, ISO, OSI Reference Model:
7-layer communications architecture
X.25
Network-Interface Recommendation
OSI Reference Model
Seven-Layer Architecture
ARPAnet → Internet
• 1980-1983, TCP/IP adopted; replaces NCP
• 1985, 1986, NSFNET organized, regional nets encouraged: Ex: NYSERNET
• 1986-1995 NSFNET expands, commercial service
• 1995 on: full-fledged Internet!
Internet and Beyond
• Millions of Hosts!
• Multimedia traffic
• Wireless connectivity: 3G cellular data, 4G all packet-switched all-purpose cellphones 802.11 connections…
• Future? Your guess is as good as mine! But see following:
Focus on Personal Networks?
Example: (with due respect to Magda!)
MAGNET
(European vision) “My Personal Adaptive Global NET”