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ALSO CALLED: Digital Signal Level 1, DS0, Digital Signal Level Hierarchy, DS1, Digital Signal Level 4, DS3, DS2, DS4, DS Level Hierarchy, Digital Signal Level 3, Digital Signal Level 2, Digital Signal Level 0
DEFINITION: To see the relationship between T-carrier, E-carrier, and DS0 multiples, see digital signal X. The T-carrier system, introduced by the Bell System in the U.S. in the 1960s, was the first successful system that supported digitized voice transmission. The original transmission rate (1.544 Mbps) in the T1 line is in common use today in Internet service provider (ISP) connections to the Internet. Another  … 
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T-Carrier Systems White Papers (View All Report Types)
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Evolving Toward the Next Phase of Email
sponsored by IBM
WHITE PAPER: This white paper explores current email usage in the workplace, as well as corporate email's anticipated future, including a more cohesive user experience with integrated application functionality, social capabilities, and transparent accessibility.
Posted: 01 Oct 2014 | Published: 30 Jun 2014


Experts Dig Into Customer Communications Archiving
sponsored by EMC
WHITE PAPER: In this white paper, our experts dig into the top trends in customer communications archiving. Explore the essential requirements of a next-gen archiving solution, along with best practices for deploying one.
Posted: 24 Sep 2015 | Published: 24 Sep 2015


Flying High on the Use of Red Hat Enterprise Linux
sponsored by Red Hat
WHITE PAPER: This white paper explains how UK-based organization Flybe, Europe's largest regional airline, was able to leverage Linux to revolutionize their IT support capabilities, creating new opportunities for innovation and revenue streams.
Posted: 03 Oct 2014 | Published: 30 May 2014

Red Hat

From Project to Product
sponsored by Red Hat
WHITE PAPER: Software developed by an open source community with testing, certification, documentation, training and support can help IT organizations experience lower middleware with total cost of ownership and risk. Read this white paper to learn about the benefits of open source technology.
Posted: 03 Aug 2015 | Published: 31 Dec 2014

Red Hat

Give digital a business focus
sponsored by Hewlett-Packard Enterprise
WHITE PAPER: Businesses need a way to consolidate this data to unify communications and deliver a seamless experience across multiple channels.For many organizations, the solution lies in outsourcing. Discover if outsourcing is right to manage your multichannel communications data in this informative white paper.
Posted: 21 Apr 2015 | Published: 31 Mar 2014

Hewlett-Packard Enterprise

HBR Executive Summary: Making the Business Case for Managing Complexity
sponsored by SAP America, Inc.
WHITE PAPER: In the following HBR shortened report, uncover how businesses have begun to help manage the complexity of their IT environment. Access now and gain insight into handling the cost of complexity, unlocking key enablers for simplification, and more.
Posted: 07 Aug 2015 | Published: 07 Aug 2015

SAP America, Inc.

Hosted vs. Premises-based Unified Communications Solutions
sponsored by XO Communications
WHITE PAPER: Access this white paper for a guide to choosing whether premises-based or cloud-based UC makes the most sense for your company.
Posted: 28 May 2015 | Published: 28 May 2015

XO Communications

How Can You Meet Business Demands Quickly, with Agility and Flexibility?
sponsored by Red Hat
WHITE PAPER: This white paper explains how Red Hat Enterprise Linux can help you leverage the same advanced environment and open source solutions applied by today's most innovative IT organizations, such as Amazon and Facebook, and transition to an infrastructure that is open and flexible.
Posted: 09 Oct 2014 | Published: 09 Oct 2014

Red Hat

How Cloud and Mobile are Perfect Partners for UC
sponsored by Avaya
WHITE PAPER: This white paper discusses a complete cloud UC solution for midmarket enterprises which brings together mobility, video, security and networking.
Posted: 05 May 2015 | Published: 05 May 2015


How SIP for Enterprise Powers Unified Communications
sponsored by XO Communications
WHITE PAPER: Download and discover everything you need to know about session initiation protocol (SIP) trunking – your answer to an easier transition from distributed voice network to centralized, cost effective VoIP solution.
Posted: 28 May 2015 | Published: 26 Dec 2014

XO Communications

How System Telemetry can Optimize Universal Experience Management
sponsored by IR
WHITE PAPER: Access this guide to discover how telemetry data, when paired with other tools, can ensure that your unified communications systems perform to specification and meet service-level agreements.
Posted: 23 Oct 2015 | Published: 23 Oct 2015


How to Dish Out High Quality Online Media Experiences
sponsored by Akamai
WHITE PAPER: Looking for ways to cook up success with online media? This white paper highlights how to satisfy user experiences by delivering reliable content with reduced network congestion, and more.
Posted: 08 Sep 2015 | Published: 08 Sep 2015


Enterprise Portal Rationalization: Using a Service-Oriented Architecture to Stop Web Asset Sprawl
sponsored by Oracle Corporation
WHITE PAPER: This paper provides an overview of the problem of Web sprawl, and an account of the rationalization strategies organizations are adopting to gain the upper hand on sprawl. Adopting a service-oriented architecture based on integrated application platform infrastructure emerges as the key to rationalizing sprawl.
Posted: 03 Apr 2009 | Published: 01 Mar 2009

Oracle Corporation

Evaluating the Total Costs of a Unified Communications Solution
sponsored by Cisco
WHITE PAPER: Discover the top recommendations for selecting a UC solution that fits the needs of your business. Learn how to weigh the most important factors and assess the TCO of your UC solution.
Posted: 17 Jul 2013 | Published: 17 Jul 2013


Extend the Value of IBM Lotus Applications to Increase Productivity with Avaya Unified Communications - Sponsored by Avaya and IBM
sponsored by Avaya
WHITE PAPER: Good communications are key to any company's success. The most successful enterprises strive for anywhere, anytime communications to best serve employees and clients who are increasingly mobile and geographically diverse. By unifying communications, a company can deliver communications anywhere, anytime and any way.
Posted: 25 Jun 2009 | Published: 25 Jun 2009


Extending Enterprise Networks with Service Delivery Environments
sponsored by Alcatel-Lucent
WHITE PAPER: This vendor white paper - prepared by Alcatel-Lucent - discuses how service providers need to continuously expand their service offerings to address increasing competitive demands, create new ways to drive business and increase market share.
Posted: 10 Sep 2007 | Published: 01 Sep 2007


Find the UC Solution that Fits your Budget
sponsored by North Sydney IT and Cisco
WHITE PAPER: This informative paper examines some of the top UC solutions on the market and compares their TCO so you can see which tool will both satisfy your requirements and fit your budget.
Posted: 03 Apr 2014 | Published: 03 Apr 2014

North Sydney IT and Cisco

Five Best Practices For Unified Communications
sponsored by AT&T Corp
WHITE PAPER: To meet today’s increasing demands, businesses need to communicate and collaborate more efficiently. Communication needs to be timely and effective, reaching people where and when they want to be reached, at the office, at home or on the go.  Read this white paper to learn the five best practices for unified communications.
Posted: 13 Oct 2010 | Published: 13 Oct 2010

AT&T Corp

From Fear to Value: CIO strategies for propelling business through the economic crisis
sponsored by IBM
WHITE PAPER: Your aspiration: As a CIO, drive change, innovation and efficiency to help build a smarter enterprise that will prosper amidst global competition. Your daily challenge: As a CIO, deliver business results faster and better–with less. This whitepaper outlines key strategies for CIOs to drive business results through the economic crisis.
Posted: 18 Jun 2010 | Published: 17 Mar 2009


Frost & Sullivan – 2013 Global VC Technology Leadership Award
sponsored by Vidyo, Inc.
WHITE PAPER: This Frost & Sullivan research paper details why Vidyo was awarded their Technology Leadership award in the videoconferencing market and how the solution meets today's top VC benchmarks.
Posted: 02 May 2013 | Published: 31 Dec 2012

Vidyo, Inc.

Gaining Cloud Fax Advantages with SAP Systems
sponsored by Esker Inc.
WHITE PAPER: Adoption of cloud services for fax communnication has steadily increased as organizations seek to reduce costs, simplify their IT landscapes and streamline processes. Companies looking to integrate fax with their SAP applications no longer have to choose between efficiency, cost and functionality.
Posted: 21 Dec 2010 | Published: 21 Dec 2010

Esker Inc.

Get Ready for Unified Communications!
sponsored by Arkadin
WHITE PAPER: This informative guide explores a 5 step plan for smooth, effective implementation of your newly acquired unified communications platform.
Posted: 20 May 2014 | Published: 20 May 2014


Getting Mobile Collaboration Right
sponsored by Avaya
WHITE PAPER: This valuable guide offers information and advice to help you prepare and build an intelligent mobile collaboration strategy.
Posted: 19 Jun 2013 | Published: 19 Jun 2013


Global Trends Drive Business Strategies
sponsored by Alcatel-Lucent
WHITE PAPER: Today’s business models do not create the commensurate revenue to fund the investment to deliver against growing traffic volumes. This is particularly salient in North America as CSPs provide more services and bandwidth on flat rate ‘all-you-can-eat’ price models. Read this paper to learn so much more.
Posted: 19 Aug 2010 | Published: 16 Aug 2010


How Customers Are Cutting Costs and Building Value with Microsoft Virtualization
sponsored by Microsoft
WHITE PAPER: Virtualization provides powerful, tangible ways to streamline many traditionally time-consuming processes and minimize the resources needed to deploy and manage IT resources. This white paper examines how Microsoft® customers are using virtualization technology to simplify their IT infrastructure, IT processes, and save money.
Posted: 19 Mar 2009 | Published: 03 Nov 2008

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T-CARRIER SYSTEMS DEFINITION (continued): …  level, the T3 line, providing 44.736 Mbps, is also commonly used by Internet service providers. The T-carrier system is entirely digital, using pulse code modulation (PCM) and time-division multiplexing (TDM). The system uses four wires and provides duplex capability (two wires for receiving and two for sending at the same time). The T1 digital stream consists of 24 64-Kbps channels that are multiplexed. (The standardized 64 Kbps channel is based on the bandwidth required for a voice conversation.) The four wires were originally a pair of twisted pair copper wires, but can now also include … 
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