answersLogoWhite

0


Best Answer

ANSI T1.413 defines the requirements for the single Asymmetric Digital Subscriber Line (ADSL) for the interface between the telecommunications network and the customer installation in terms of their interaction and electrical characteristics. ADSL allows the provision of voiceband services (including POTS and data services up to 56 kbit/s) and a variety of digital channels. In the direction from the network to the customer premises, the digital bearer channels may consist of full-duplex low-speed bearer channels and simpler high-speed bearer channels; in the other direction, only low-speed bearer channels are provided.

The American National Standards Institute (ANSI) Telecommunications Committee created the first standardized ADSL specification. It defines the minimum requirements for satisfactory performance of ADSL systems using the Discrete Multi-Tone (DMT) line code. DMT divides the useful bandwidth of the standard two wire copper medium used in the PSTN, which is 0 to 1104 kHz, into 256 separate 4.3125 kHz wide bins called sub-carriers.

Up to 254 sub-carriers are used; each of these 254 sub-carriers can support the modulation of 0 to 15 bits. The data frame rate (baud rate) is 4,000 frames per second, the maximum theoretical downstream data rate of an ADSL system is 15.24 Mbit/s. However, because the data is split up into packets (actually Reed-Solomon encoded codewords) of 255 bytes, the maximum achievable downstream data rate is 8.128 Mbit/s (including other overheads). It is possible to interleave two Reed-Solomon codewords and obtain one logical codeword of 510 bytes. If this is done, then the maximum theoretical download speed goes back up to around 15 Mbit/s.

In the upstream direction, a maximum of 30 sub-carriers can be used, again each frame modulated with up to 15 bits. Taken with the frame rate of 4,000 per second, the maximum throughput is a just over 1.5 Mbit/s.

In order to combine the PSTN service with download and upload ADSL signals the bandwidth is split into discrete parts using frequency-division multiplexing (FDM). In this case: 0-4 kHz is POTS, 26-138 kHz is the upload band and 138-1100 kHz is the download band.

User Avatar

Wiki User

14y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: T-1 ansi standards
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

Which is the largest oil tanker in the world?

T1 Africa, T1 Asia, T1 Europe and T1 Oceania all made by South Korea


Residential Internet T1?

form_title=Residential Internet T1 form_header=Do all you want to on the interent with your T1 line! Where will the T1 line be installed?=_ What is your expected data usage?=_ When would you like the T1 line installed?=_


Residential Integrated T1?

form_title=Residential Integrated T1 form_header=Have it bundled. Get integrated T1 for your home. Where do you need the T1 line installed?=_ What is the primary reason for installing intergrated T1?=_ When would you like your service installed?=_


What is the frequency of a T1?

T1 Frequency is 1.544 MHz


What does the T1 in T1 internet stand for?

T1 stand for how fast your Internet connection is going to be. T1 is the fastest of all, this would be a very high speed internet connection ( usually using fiber optics). The term T1 refers to the encoding.


Derivation of coefficient of performance of carnot refrigeration cycle?

COF = h1-h4/h2-h1=T1(s1-s4)/T2-T1(s1-s4)=T1/T2-T1


Where can you find pricing on a T1?

T1 is an internet connection type, similar to DSL. T1 service providers vary by geographical area as far as availability, as T1 connections are not available in all areas. Pricing for T1 internet service can be obtained by visiting websites such as T1 Shopper to locate services available in their location.


What P1v1 divided by t1p2v2 divided by t2 solve for t1?

This question refers to the combined gas law: (P1V1)/T1=(P2V2)/T2, where P is pressure, V is volume, and T is temperature in Kelvins.To solve for T1, rearrange the equation to isolate T1.T1=(P1V1T2)/(P2V2)


Residential Data T1?

form_title=Residential Data T1 form_header=Browse with speed. Get a T1 connection1 for your home. Why are you signing up for T1 service?=_ Have you used a T1 service in the past?= () Yes () No How many computers will be connected?= {(),1,2,3,4,5,6,7,8,9,10,More than 10}


What does a T1 modem do?

Allows your computer to communicate with the internet across a T1 connection.


What about T1 Cable?

A T1 Cable is the same as an Straighat Through Ethernet cable. Pins used for a T1 are 1,2,4,5 Pins used for Ethernet are 1,2,3,6 www.intelletrace.com


What is a T1 circuit uesd for?

T1 usage is for Voice or Data. T1 is 23 Voice Trunks or 1.5 Mbps. Can be channelized to do both at the same time. www.intelletrace.com