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Synchronous Digital Hierarchy

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ALSO CALLED: S D H, SDH
DEFINITION: SDH (Synchronous Digital Hierarchy) is a standard technology for synchronous data transmission on optical media. It is the international equivalent of Synchronous Optical Network. Both technologies provide faster and less expensive network interconnection than traditional PDH (Plesiochronous Digital Hierarchy) equipment. In digital telephone transmission, "synchronous" means the bits from one call  … 
Definition continues below.
Synchronous Digital Hierarchy White Papers (View All Report Types)
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Prepare for Change: Seven Questions that Prepare You for BYOD
sponsored by IBM
WHITE PAPER: This white paper provides seven questions you should answer as you take on new mobile capabilities.
Posted: 06 Jul 2015 | Published: 31 Dec 2011

IBM

Putting the “Secure” in Secure Remote Access
sponsored by Citrix
WHITE PAPER: In this white paper, you'll learn about the core strengths of Citrix NetScaler paired with Unified Gateway for secure remote access consolidation.
Posted: 05 Jun 2015 | Published: 29 May 2015

Citrix

Safeguarding Data and the Mobile Enterprise
sponsored by IBM
WHITE PAPER: As enterprises explore the use of mobile applications, new processes have to be built to secure these applications against compromise. This white paper addresses the unique risks associated with mobile devices, and the capabilities you should consider when building your roadmap to safeguarding data and applications.
Posted: 30 Jul 2015 | Published: 30 Jul 2015

IBM

Strategic Migration Planning Guide: Weblogic to JBoss Enterprise Application Platform
sponsored by Red Hat
WHITE PAPER: Read about the proven five-step process designed to identify migration opportunities, examine the risks associated with various migration scenarios, create a standard enterprise environment, and develop a comprehensive and strategic migration plan to the JBoss Enterprise Application Platform.
Posted: 28 Jul 2015 | Published: 30 Sep 2014

Red Hat

Strategic Migration Planning Guide: WebSPHERE to JBoss Enterprise Application Platform
sponsored by Red Hat
WHITE PAPER: This migration planning guide provides a five-step process designed to identify migration opportunities, examine risks, create a standard enterprise environment, and develop a strategic migration plan. Read now for insight into the considerations and processes required to move to an enterprise app platform.
Posted: 28 Jul 2015 | Published: 30 Sep 2014

Red Hat

The Packet Delivery Process: Locally Connected Hosts
sponsored by Global Knowledge
WHITE PAPER: This white paper focuses on the packet delivery process when two devices are locally connected, containing definitions of key terms and a detailed look at the actual process of exchanging data.
Posted: 29 Sep 2014 | Published: 29 Sep 2014

Global Knowledge

The Packet Delivery Process: Remotely Connected Hosts
sponsored by Global Knowledge
WHITE PAPER: This white paper focuses on the packet delivery process when two devices are remotely connected, including key definitions and a detailed look at the actual process of exchanging data.
Posted: 29 Sep 2014 | Published: 29 Sep 2014

Global Knowledge

Too Relaxed About Stress Testing
sponsored by SAS
WHITE PAPER: This infographic reveals startling statistics about different banks' stress testing strategies. Use this resource to determine where your organizations stands in comparison, and what a comprehensive stress testing plan can do for you.
Posted: 01 May 2015 | Published: 31 Dec 2014

SAS

Top 10 Measurement and Planning Mistakes and How to Avoid Them
sponsored by Information Builders
WHITE PAPER: Access this white paper to review the 10 most common planning and measurement errors that businesses commit. In addition to examining these blunders, discover real-world examples of how an enterprise can avoid or correct them. Learn strategic solutions, such as setting sensible goals.
Posted: 08 Apr 2015 | Published: 31 Dec 2014

Information Builders

Top 4 Security Concerns of the SaaS Delivery Model
sponsored by SAP
WHITE PAPER: This white paper addresses security concerns brought forth by cloud and SaaS models, including identity management, data storage, and data transmission. Learn the imperatives of built-in security features when it comes to your deployment.
Posted: 09 Jul 2015 | Published: 09 Jul 2015

SAP

RFID Basics for Retailers
sponsored by Intermec
WHITE PAPER: This white paper illuminates RFID by providing an overview of RFID technology; describing the current status of relevant RFID standards initiatives; illustrating how RFID can be integrated to enhance existing wireless LAN, bar code and mobile computing systems; and providing guidance for selecting and planning RFID pilots and implementations.
Posted: 04 Mar 2009 | Published: 04 Mar 2009

Intermec

Router Essentials
sponsored by Global Knowledge
WHITE PAPER: Build a basic foundation of knowledge about routers, the devices that allow you to move packets between networks, by reading this white paper.
Posted: 10 Dec 2008 | Published: 11 Oct 2008

Global Knowledge

Securing the Foundation of Information Technology (IT) Systems
sponsored by Trusted Computer Solutions
WHITE PAPER: This paper explains how there is no one process to make any organization 100% secure, but establishing a company-wide security policy based on industry-standard best practices is a good place to start. Many of these best practices can be implemented as part of the operating system assessment and lock down process.
Posted: 12 Jan 2010 | Published: 12 Jan 2010

Trusted Computer Solutions

Seven Steps to Achieving Better Requirements Engineering in Your Organization
sponsored by IBM
WHITE PAPER: Requirements engineering is about more than just analyzing documenting requirements. It is an important and multifaceted part of systems engineering that broadens the product development process. Companies that successfully introduce a new requirements engineering process don't just change their process and technology; they change their thinking.
Posted: 13 May 2009 | Published: 31 Mar 2009

IBM

SOA Best Practices: The BPEL Cookbook
sponsored by Oracle Corporation
WHITE PAPER: The Business Process Execution Language (BPEL) Cookbook highlights SOA best practices and challenges, detailing the importance of BPEL and other standards-based technologies in accelerating the adoption of an SOA.
Posted: 16 Mar 2009 | Published: 02 Aug 2007

Oracle Corporation

SOA Platforms - Evolving to Meet Stringent Market Realities
sponsored by Fiorano Software, Inc.
WHITE PAPER: This white paper details the evolution of SOA platforms from point products to second-generation architectures such as the enterprise service grid.
Posted: 13 Jun 2007 | Published: 01 Jun 2007

Fiorano Software, Inc.

Ten Top Problems Network Techs Encounter
sponsored by Fluke Networks
WHITE PAPER: This whitepaper discusses ten common problems encountered by network technicians today and their symptoms, causes, and resolutions.
Posted: 27 Jan 2010 | Published: 01 Jul 2009

Fluke Networks

The Essentials Series: Solving Network Problems Before They Occur - How to Use SNMP in Network Problem Resolution
sponsored by Ipswitch WhatsUp Gold
WHITE PAPER: The Simple Network Management Protocol can help you get a clear view into your network. Network visibility is one of the most important ways you can quickly find and eliminate issues and ensure that your network is doing everything it’s supposed to.
Posted: 13 Feb 2012 | Published: 13 Feb 2012

Ipswitch WhatsUp Gold

VOIP Infrastructure for the Evolving Enterprise: How to Control Costs, Mitigate Risk, and Ensure Service Levels in an Ever-Changing Network Environment
sponsored by NET Quintum
WHITE PAPER: There are significant differences in VoIP hardware functionality that affect the cost, risk and consumption of staff resources. This white paper outlines what to consider when selecting a VoIP gateway/switching solutio
Posted: 05 Jun 2008 | Published: 01 Mar 2008

NET Quintum

What Enterprises Should Do About IPv6 in 2011
sponsored by Cisco Systems, Inc.
WHITE PAPER: The purpose of this white paper is to provide enterprises with guidance, based on a three- to five-year outlook, on how IPv6 should be included in their network design, planning, and operations starting today. The intended audience is enterprise network administrators.
Posted: 26 Jan 2011 | Published: 26 Jan 2011

Cisco Systems, Inc.

Wireless LANs Standards: Where Are We Now?
sponsored by Burton Group
WHITE PAPER: Not all standards are created equal. Some are technically elegant but achieve little market adoption. Others are broadly deployed.
Posted: 18 Jul 2008 | Published: 13 Nov 2006

Burton Group
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SYNCHRONOUS DIGITAL HIERARCHY DEFINITION (continued): … SDH (Synchronous Digital Hierarchy) is a standard technology for synchronous data transmission on optical media. It is the international equivalent of Synchronous Optical Network. Both technologies provide faster and less expensive network interconnection than traditional PDH (Plesiochronous Digital Hierarchy) equipment. In digital telephone transmission, "synchronous" means the bits from one call are carried within one transmission frame. "Plesiochronous" means "almost (but not) synchronous," or a call that must be extracted from more than one transmission frame.SDH uses the following Synchronous Transport Modules (STM) and rates: STM-1 (155 megabits per second), STM-4 (622 Mbps), STM-16 (2.5 gigabits per second), and STM-64 (10 Gbps).
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