Cable can be used to access and connect to the Internet. It is used for high-speed Internet access. It is
"always on", and is generally for home usage rather than for business purposes. A cable Internet connection
is much faster than any type of dial-up connection. However, at this current time, using cable for business
applications is not as advantageous as using some of the other technologies. You cannot connect a network to
the Internet with cable.
Due to the current inherent limitations of cable technology, it is not usually a viable solution for
businesses. These limitations include the wiring ( most businesses are not wired), congestion and delay
(the more people using cable, the slower the service), "shared" connectivity, security (your neighbors
may be able to access your files), and cable's inability to support any type of web or email server.
Dial-up access is an inexpensive but slower form of Internet access in which the client uses a modem
connected to the computer and a telephone line to dial the Internet service provider's (ISP) node,
a dial-up server type such as the Point-to-Point Protocol and TCP/IP protocols to establish a modem-to-modem
link, which is then routed to the Internet. It is currently regarded as legacy technology given the advent
of widely available broadband Internet access in the Western world, though many people worldwide still use
it simply because they do not have access to a faster connection technology. Products such as NetZero HiSpeed 3G
provide dial-up internet access that approaches DSL speeds. User not wanting to pay high broadband internet
access prices can benefit from accelerated dial-up technology such as NetZero HiSpeed 3G.
DSL is an excellent Internet access solution for SMBs. It is an affordable and easy-to-install way to
access the Internet and connect your network to it. This high-speed "always on" service lets you access
the Internet over ordinary phone lines at speeds up to 8 Mbps for downloads and 1 Mbps for uploads(i.e.,
A DSL modem and an Ethernet card are required for installation. A splitter may also be required.
A splitter is a frequency filter that separates the high frequencies used for sending data upstream
and receiving downstream data from the low frequency range used for voice. These high and low frequencies
are transmitted at the same time.
A 56 Kbps modem is a good starting point for Internet access and lower end applications, especially those
businesses on a modest budget. This technology is a dial-up service. Each user needs his own modem and phone
line to dial-up and be connected to the Internet. You must have a jack with a phone line located near the
computer. Remember that the modem ties up the phone line so you won't be able to use the phone and computer
at the same time. If you want to use multiple devices simultaneously, you should consider choosing another
Modem technology can be costly if you add many users. The cost of many phone lines and modems may be
prohibitive. One way to solve this is to install a modem on a server computer and use software that
enables your users to access the modem as a shared device. NetWare, Windows NT Server, and Windows
95/98 cannot accomplish this, so you have to purchase additional modem-sharing software to enable the
server to share its network with the network. If you decide to set up your network this way, the downside
is that only one network can access the Internet at the same time. Also, performance is never on the
high-end due to the limitations of this set-up. Another way to share modems on the network is to set up
a separate computer to function as a communications server. You can then install one or more modems in the
communications server computer so that your network users can access the modems. Special software will be
required. The best way to share modems is to install a special-purpose device that connects your network
to the Internet via modems. These devices are readily available on the market.
You can use Primary Rate Integrated Services Digital Network (PRI ISDN) to both access the Internet and
connect your network to the Internet. It is a dial-up service and does not require a modem. It's quite
a bit faster than modem service. PRI ISDN has 23 B channels plus one 64 Kbps D channel. Each channel
has a 64Kbps capacity, enabling a total transmission speed of up to 1.536Mbps. Additionally, since you
can split the line into separate channels, multiple users can talk on the phone and use the computer at
the same time. Each user can work at a speed of 64 Kbps.
T-1 is a leased Internet access service and network-connect technology best suited for large networks
where 20 or more users are accessing the Internet at the same time. T-1 is about 10 times as fast as
ISDN and has speeds up to about 1.54 Mbps. As many as 24 users can use the service simultaneously
with each using 64 Kbps. It is an "always on" service.
T-1 can be used to connect a Private Branch Exchange (PBX) to the telephone company's central office (CO).
T-1 is frequently used to connect remote LANs.
If T-1 is a good solution for your business, and you don't have 20 or more users, you can lease a portion
of a T-1 line. This will keep your expenses down and still give you a premium service for accessing the
Internet and connecting your network to it.
T-3 is a high-end leased service used by many medium-to-large sized organizations for accessing the
Internet and connecting a network to it. A T-3 line can transmit data at up to 44 Mbps. That's extremely
fast! It's the equivalent of 28 T-1 lines. As many as 672 users can use the service simultaneously while
working at 64 Kbps. T-3 is an excellent solution for businesses with large calling volumes (i.e., calling
centers). It is an "always on " service.
T-3 can be used to connect a Private Branch Exchange (PBX) to the telephone company's central office (CO).
T-3 is also used to link remote LANs.
If T-3 is a good solution for your business, and you don't need the full T-3 line, you can lease a portion
of it. This will keep your expenses down, allow you to have many users, and still give you a premium service
for accessing the Internet and connecting your network to it.
Frame Relay is used for large-scale applications requiring accessing the Internet and interconnecting LANs.
It is also used to connect LANs to WANs. Frame Relay's data rates range from 56 Kbps to 45 Mbps, giving you
a wide range of flexible options to choose from for your unique business needs. It is an "always on" service.
If your LAN Internet usage varies significantly throughout the day, and has bursty data, Frame Relay may be
the best solution for you. With Frame Relay Internet access, you can maximize your Internet connectivity at
key times throughout the day by "bursting" up to the full limit of the transport you choose. A burst is a
specific amount of data sent or received in one intermittent operation. Bursty data uses bandwidth only
sporadically. It is sent intermittently and does not use the total bandwidth of a circuit 100 percent of
VoIP is a technology that allows telephone calls to be
made over computer networks like the Internet. VoIP converts analog
voice signals into digital data packets and supports real-time, two-way
transmission of conversations using Internet
VoIP calls can be made on the Internet using a VoIP service provider and
standard computer audio systems. Alternatively, some service providers support
VoIP through ordinary telephones that use special adapters to connect to
a home computer network. Many VoIP implementations are based on the H.323 technology
VoIP offers a substantial cost savings over traditional long distance telephone
calls. The main disadvantage of VoIP is, like cell phones, a greater potential
for dropped calls and generally lesser voice quality.