Transcript Introduction - Irwan Sembiring

Overview of E-Business
Technologies
Irwan Sembiring
Categories of e-Business
Technology
• Network Gear & Services
• Outsourcers
• Web Applications
• Business Applications
• Security & Disaster Recovery
• Data Storage & Management
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Packet Switching
TCP = TRANSMISSION
CONTROL
PROTOCOL
(Breaks messages into packets
and reassembles them)
IP = INTERNET
PROTOCOL
(Moves packets around
the Internet)
SOURCE: J. DECEMBER
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ISDN
• 64 Kbps to 128 Kbps
• Integrated Services Digital Network (ISDN) provides high-speed
access through a digital switching system, using two 64 Kbps data
channels and one 15 Kbps signaling channel.
• The 64 Kbps channels can be used for either data or voice. The
channels can be combined to deliver 128 Kbps data service.
• ISDN is a symmetrical service offering the same speed for sending
data as for receiving data.
• ISDN is inherently more costly than a Digital Subscriber Line, because
it requires additional digital switching equipment.
• The adaptation for digital switches to handle a substantial volume of
data calls is quite expensive.
• Also, ISDN is limited to 128 Kbps, while xDSL has a wide variety of
available bandwidths.
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Digital Subscriber Line (DSL)
• 144 Kbps to 9 Mbps
• A technology using standard copper telephone lines to
provide secure, reliable, high-speed Internet access. This
is a general term for any local network loop that is digital
in nature.
• DSL technology is available in several varieties.
• xDSL is the generic term for the suite of DSL services, where the
"x" can be replaced with any of the letters that represent one of
the various types of DSL technology (ADSL, HDSL, IDSL, MDSL,
RADSL, SDSL, VDSL).
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Microwave
• 256 Kbps to 1.5 Mbps
• A system offering data speeds of 256 Kbps to 1.5
Mbps. This can be a cost-saving alternative for
remote locations, as installation does not require a
telephone connection.
Irwan Sembiring
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T1
• Up to 1.544 Mbps
• A digital transmission link with a capacity of 1.544 Mbps.
• T1 uses two pairs of normal twisted wires, the same as
found in most residences.
• T1 is a standard for digital transmission in the United States.
• T1 lines are used to connect networks across remote distances.
• A fractional T1 can also be used to provide a portion of a full T1
connection – for example, one-half a T1 is 772 Kb
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Personal Satellite System
• Up to 2 Mbps download
• Under a one-way satellite system, an antenna (dish)
receives signals from a satellite.
• The earth station then connects to a wireline
system, cellular carrier or other carrier.
• Download speeds can reach 2 Mbps. Another
system, such as T-1 or modem, can be used for
uplink.
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Cable Modem
• Up to 4 Mbps
• Several cable companies have begun offering highspeed data access and phone service to
subscribers.
• Data speeds vary due to neighborhood usage, but
can be as high as 4 Mbps.
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• The router is a device which inter-connects networks in
an heterogeneous environment.
• The router also serves as a routing switch-board.
• Routers connect two or more networks and forward data
packets between them.
• When data arrives from one of the segments, the router
decides, according to it's routing table, to which segment to
forward that data.
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• The load balancer distributes user requests to multiple
servers based on traffic volume and server availability.
• Many of today's load-balancing products also provide contentbased balancing, which allows Web administrators to match
traffic to server power by designating a large, fast disk array for
image content and a fast and secure server for Secure Sockets
Layer (SSL) and electronic commerce transactions.
• Some load balancers can perform trickier maneuvers, such as
isolating Common Gateway Interface requests and sending them
to a separate server or prioritizing SSL traffic over HTML traffic.
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Switches
• These devices relay data between servers instantly.
• Where routers coordinate the flow of traffic into
and out of your Web farm, the switch directs the
flow of packets on the inside.
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See presentation on
“Security”
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See presentation on
“SCM, CRM, & ERP”
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