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G.992.5 (also referred to as ADSL2+, G.dmt.bis+, and G.adslplus) is an
ADSL2+ is capable of doubling the frequency band of typical ADSL connections from 1.1 MHz to 2.2 MHz. This doubles the downstream data rates of the previous ADSL2 standard (which was up to 12 Mbit/s), and like the previous standards will degrade from its peak bitrate after a certain distance.
ADSL2+ also allows port bonding. This is where multiple ports are physically provisioned to the end user and the total bandwidth is equal to the sum of all provisioned ports. So if 2 lines capable of 24 Mbit/s were bonded the result would be a connection capable of 48 Mbit/s download and twice the original upload speed. Not all DSLAM vendors have implemented this functionality.
ADSL2+ port bonding is also known as ''G.998.x'' or ''G.Bond''.
ITU-T Recommendation G.992.5: Asymmetric Digital SubscriberLine (ADSL) transceivers – Extended bandwidth ADSL2 (ADSL2+)
* http://homehelphub.com/Tutorials/ADSL {{DEFAULTSORT:Itu G.992.5 Digital subscriber line ITU-T recommendations ITU-T G Series Recommendations Telecommunications-related introductions in 2009 Telecommunication protocols
ITU-T
The International Telecommunication Union Telecommunication Standardization Sector (ITU-T) is one of the three Sectors (branches) of the International Telecommunication Union (ITU). It is responsible for coordinating Standardization, standards fo ...
standard for asymmetric digital subscriber line
Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide ...
(ADSL) broadband
In telecommunications, broadband or high speed is the wide-bandwidth (signal processing), bandwidth data transmission that exploits signals at a wide spread of frequencies or several different simultaneous frequencies, and is used in fast Inter ...
Internet access
Internet access is a facility or service that provides connectivity for a computer, a computer network, or other network device to the Internet, and for individuals or organizations to access or use applications such as email and the World Wide ...
. The standard has a maximum theoretical downstream sync speed of 24 megabits per second (Mbit/s). Utilizing G.992.5 Annex M upstream sync speeds of 3.3 Mbit/s can be achieved.
Technical information
ADSL2+ extends the capability of basicADSL
Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over Copper wire, copper telephone lines than a conventional voiceband modem ...
by doubling the number of downstream channels. The data rates can be as high as 24 Mbit/s downstream and up to 1.4 Mbit/s upstream depending on the distance from the DSLAM
A digital subscriber line access multiplexer (DSLAM, often pronounced ''DEE-slam'') is a network device, often located in telephone exchanges, that connects multiple customer digital subscriber line (DSL) interfaces to a high-speed digital co ...
to the customer's premises.
ADSL2+ is capable of doubling the frequency band of typical ADSL connections from 1.1 MHz to 2.2 MHz. This doubles the downstream data rates of the previous ADSL2 standard (which was up to 12 Mbit/s), and like the previous standards will degrade from its peak bitrate after a certain distance.
ADSL2+ also allows port bonding. This is where multiple ports are physically provisioned to the end user and the total bandwidth is equal to the sum of all provisioned ports. So if 2 lines capable of 24 Mbit/s were bonded the result would be a connection capable of 48 Mbit/s download and twice the original upload speed. Not all DSLAM vendors have implemented this functionality.
ADSL2+ port bonding is also known as ''G.998.x'' or ''G.Bond''.
See also
*ADSL
Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over Copper wire, copper telephone lines than a conventional voiceband modem ...
* List of interface bit rates
* VDSL#VDSL2
References
External links
ITU-T Recommendation G.992.5: Asymmetric Digital SubscriberLine (ADSL) transceivers – Extended bandwidth ADSL2 (ADSL2+)
* http://homehelphub.com/Tutorials/ADSL {{DEFAULTSORT:Itu G.992.5 Digital subscriber line ITU-T recommendations ITU-T G Series Recommendations Telecommunications-related introductions in 2009 Telecommunication protocols