ISP (Internet Service Provider)
An Internet service provider (abbr. ISP, also called Internet access provider or
IAP) is a business or organization that provides to consumers access to the
Internet and related services. In the past, most ISPs were run by the phone
companies. Now, ISPs can be started by just about any individual or group with
sufficient money and expertise. In addition to Internet access via various
technologies such as dial-up and DSL, they may provide a combination of services
including Internet transit, domain name registration and hosting, web hosting,
and colocation
ISP connection options
ISPs employ a range of technologies to enable consumers to connect to their
network. For "home users", the most popular options include dial-up, DSL
(typically ADSL), Broadband wireless access, Cable modem, and ISDN (typically
BRI). For customers who have more demanding requirements, such as
medium-to-large businesses, or other ISPs, DSL (often SHDSL or ADSL), Ethernet,
Metro Ethernet, Gigabit Ethernet, Frame Relay, ISDN (BRI or PRI), ATM, satellite
Internet access and SONET are more likely. With the increasing popularity of
downloading music and online video and the general demand for faster page loads,
higher bandwidth connections are becoming more popular.
How ISPs connect to the Internet
Just as their customers pay them for Internet access, ISPs themselves pay
upstreamISPs for Internet access. In the simplest case, a single connection is
established to an upstream ISP using one of the technologies described above, and
the ISP uses this connection to send or receive any data to or from parts of the
Internet beyond its own network; in turn, the upstream ISP uses its own upstream
connection, or connections to its other customers (usually other ISPs) to allow the
data to travel from source to destination.
In reality, the situation is often more complicated. For example, ISPs with more
than one Point of presence (PoP) may have separate connections to an upstream
ISP at multiple PoPs, or they may be customers of multiple upstream ISPs and
have connections to each one at one or more of their PoPs. ISPs may engage in
peering, where multiple ISPs interconnect with one another at a peering point or
Internet exchange point (IX), allowing the routing of data between their
networks, without charging one another for that data - data that would otherwise
have passed through their upstream ISPs, incurring charges from the upstream
ISP.
ISPs that require no upstream, and have only customers and/or peers, are
called Tier 1 ISPs, indicating their status as ISPs at the top of the Internet
hierarchy. Routers, switches, Internet routing protocols, and the expertise of
network administrators all have a role to play in ensuring that data follows the
best available route and that ISPs can "see" one another on the Internet.
Virtual ISP
A Virtual ISP (vISP) purchases services from another ISP
(sometimes called a wholesale ISP or similar within this context) that allow the
vISP's customers to access the Internet via one or more Points of Presence
(PoPs) that are owned and operated by the wholesale ISP.
There are various models for the delivery of this type of service, for example, the
wholesale ISP could provide network access to end users via its dial-up modem PoPs
or DSLAMs installed in telephone exchanges, and route, switch, and/or tunnel the
end user traffic to the vISP's network, whereupon they may route the traffic toward its
destination.
In another model, the vISP does not route any end user traffic, and needs only
provide AAA (Authentication, Authorization and Accounting) functions, as well as any
"value-add" services like email or web hosting. Any given ISP may use their own
PoPs to deliver one service, and use a vISP model to deliver another service, or, use
a combination to deliver a service in different areas.
The service provided by a wholesale ISP in a vISP model is distinct from that of
an upstream ISP, even though in some cases, they may both be one and the same
company. The former provides connectivity from the end user's premises to the
Internet or to the end user's ISP, the latter provides connectivity from the
end user's ISP to all or parts of the rest of the Internet.
A vISP can also refer to a completely automated white label service offered to
anyone at no cost or for a minimal set-up fee. The actual ISP providing the
service generates revenue from the calls and may also share a percentage of that
revenue with the owner of the vISP. All technical aspects are dealt with leaving
the owner of vISP with the task of promoting the service. This sort of service
is however declining due to the popularity of unmetered Internet access also
known as flat-rate.
Attributes and Credits
The information and facts supplied on this subject
derive from http://en.wikipedia.org/wiki/Main_Page
An Internet service provider (abbr. ISP, also called Internet access provider or
IAP) is a business or organization that provides to consumers access to the
Internet and related services. In the past, most ISPs were run by the phone
companies. Now, ISPs can be started by just about any individual or group with
sufficient money and expertise. In addition to Internet access via various
technologies such as dial-up and DSL, they may provide a combination of services
including Internet transit, domain name registration and hosting, web hosting,
and colocation
ISP connection options
ISPs employ a range of technologies to enable consumers to connect to their
network. For "home users", the most popular options include dial-up, DSL
(typically ADSL), Broadband wireless access, Cable modem, and ISDN (typically
BRI). For customers who have more demanding requirements, such as
medium-to-large businesses, or other ISPs, DSL (often SHDSL or ADSL), Ethernet,
Metro Ethernet, Gigabit Ethernet, Frame Relay, ISDN (BRI or PRI), ATM, satellite
Internet access and SONET are more likely. With the increasing popularity of
downloading music and online video and the general demand for faster page loads,
higher bandwidth connections are becoming more popular.
How ISPs connect to the Internet
Just as their customers pay them for Internet access, ISPs themselves pay
upstreamISPs for Internet access. In the simplest case, a single connection is
established to an upstream ISP using one of the technologies described above, and
the ISP uses this connection to send or receive any data to or from parts of the
Internet beyond its own network; in turn, the upstream ISP uses its own upstream
connection, or connections to its other customers (usually other ISPs) to allow the
data to travel from source to destination.
In reality, the situation is often more complicated. For example, ISPs with more
than one Point of presence (PoP) may have separate connections to an upstream
ISP at multiple PoPs, or they may be customers of multiple upstream ISPs and
have connections to each one at one or more of their PoPs. ISPs may engage in
peering, where multiple ISPs interconnect with one another at a peering point or
Internet exchange point (IX), allowing the routing of data between their
networks, without charging one another for that data - data that would otherwise
have passed through their upstream ISPs, incurring charges from the upstream
ISP.
ISPs that require no upstream, and have only customers and/or peers, are
called Tier 1 ISPs, indicating their status as ISPs at the top of the Internet
hierarchy. Routers, switches, Internet routing protocols, and the expertise of
network administrators all have a role to play in ensuring that data follows the
best available route and that ISPs can "see" one another on the Internet.
Virtual ISP
A Virtual ISP (vISP) purchases services from another ISP
(sometimes called a wholesale ISP or similar within this context) that allow the
vISP's customers to access the Internet via one or more Points of Presence
(PoPs) that are owned and operated by the wholesale ISP.
There are various models for the delivery of this type of service, for example, the
wholesale ISP could provide network access to end users via its dial-up modem PoPs
or DSLAMs installed in telephone exchanges, and route, switch, and/or tunnel the
end user traffic to the vISP's network, whereupon they may route the traffic toward its
destination.
In another model, the vISP does not route any end user traffic, and needs only
provide AAA (Authentication, Authorization and Accounting) functions, as well as any
"value-add" services like email or web hosting. Any given ISP may use their own
PoPs to deliver one service, and use a vISP model to deliver another service, or, use
a combination to deliver a service in different areas.
The service provided by a wholesale ISP in a vISP model is distinct from that of
an upstream ISP, even though in some cases, they may both be one and the same
company. The former provides connectivity from the end user's premises to the
Internet or to the end user's ISP, the latter provides connectivity from the
end user's ISP to all or parts of the rest of the Internet.
A vISP can also refer to a completely automated white label service offered to
anyone at no cost or for a minimal set-up fee. The actual ISP providing the
service generates revenue from the calls and may also share a percentage of that
revenue with the owner of the vISP. All technical aspects are dealt with leaving
the owner of vISP with the task of promoting the service. This sort of service
is however declining due to the popularity of unmetered Internet access also
known as flat-rate.
Attributes and Credits
The information and facts supplied on this subject
derive from http://en.wikipedia.org/wiki/Main_Page
| ____________________________________________________________________ |
| ____________________________________________________________________ |
| Copyright © voipsolutionjournal.com - 2007 All Rights Reserved - VOIP Solution Journal VoIP Solution Journal Selecting a VoIP Solution Phone System for Home and Business. |
| Home | Contact Us | About Us | Site Map | Privacy Policy | More Voip Solution Articles |
________________________________________________________________________
_____________________________________________________________________
|
| Selecting a VoIP Solution Phone System for Home and Business. |
| VOIP Solution Journal |
| | VoIP Phone | Voip PBX | Business Small VoIP | Vonage VoIP | VoIP Service Provider | | VoIP Phone System | Business Service VoIP | WiFi VoIP | |
The VoIp Solution Workbook is a comprehensive guide to terms and definitions that
are commonly used in reference to understanding VoIP Solutions.
are commonly used in reference to understanding VoIP Solutions.
| ISP (Internet Service Provider) |