Pita lebar: Perbedaan antara revisi

 

 

 

== Sekilas ==

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== Teknologi ==

[[ISDN]] is an older telephone data service that can operate at speeds of up to 128 kbit/s. It is therefore not really considered a true form of broadband, but it does have the advantage that it can share an existing phone line, and it has no distance limitations like DSL. When a phone call occurs, some of the bandwidth is allocated to the call, reducing the connection speed. When the call ends, the connection increases speed again. ISDN is a relatively low-cost option for rural users with otherwise terrible dialup access speeds, but it is starting to be phased out and is no longer available in some areas.

 

{{utama|Internet satelit}}

 

 

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=== ISP tanpa kabel ===

Traditional 802.11b was licensed for omnidirectional service spanning only 300 to 500 feet. By focusing the signal down to a narrow beam with a [[yagi antenna]] it can instead operate reliably over a distance of many miles.

 

Rural Wireless-ISP installations are typically not commercial in nature and are instead a patchwork of systems built up by hobbyists mounting antennas on [[radio masts and towers]], agricultural [[storage silo]]s, very tall trees, or whatever other tall objects are available.-->

=== T-1/DS-1 ===

These are highly-regulated services traditionally intended for businesses, that are managed through Public Service Commissions in each state, must be fully defined in PSC [[tariff documents]], and have management rules dating back to the early 1980s which still refer to [[teletypes]] as potential connection devices. As such, T-1 services have very strict and rigid service requirements which drive up the provider's maintenance costs and may require them to have a technician on standby 24 hours a day to repair the line if it malfunctions. (In comparison, ISDN and DSL are not regulated by the PSCs at all.)

 

People attempting to establish rural service via a Wireless ISP, ISDN, or T-1 will run into an additional cost issue, where the physical connection (or [[local loop]]) is considered separate from the actual Internet service provided from a [[Point of Presence]] (POP). This is as if you had to pay the water utility to rent the water main in the ground, in addition to paying to get water delivered through the main from the tower. For a T-1, for example, in the US the loop alone may cost $1200 per month, and the 1.5 megabit per second business-class Internet service (with fixed a [[IP address]] and a [[subnetwork|subnet]]) may cost an additional $1000 per month. Attempting to reduce monthly costs by establishing your own non-profit Wi-Fi network and sharing the T-1 connection costs has an additional pitfall: your service provider may want to charge you an additional "ISP reseller's fee" of $800 per month.

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== Pranala luar ==

 

[[Kategori:Internet]]