(Synchronous Digital Hierarchy) The European counterpart to SONET. See SONET.
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- RAD'S Ethernet NTU's Provide Interoute With End-to-End Customer Visibility
- Interoute owns and operates Europe's largest Next Generation network. The company wanted to deliver managed Ethernet services with challenging end-to-end SLAs over a network that spans several providers. Interoute's Ethernet Flex and Ethernet Clear offer customers private connections between sites, and it is here where RADs ETX-202 Ethernet network termination...
- Case studies 2008-05-22
- Cisco Network Solutions for the Telco DCN: SONET/SDH OSI Environments
- This paper is directed to Competitive Local Exchange Carriers CLECs, incumbent Local ExChange Carriers ILECs, and Post, Telephone and Telegraphs PTTs, collectively referred to as telcos short for telephone companies. This paper describes Cisco network solutions for transporting data between Synchronous Optical Network SONET and Synchronous Digital Hierarchy SDH and...
- White papers 2008-01-03
- Nortel Network Case Study: IT-AUSTRIA
- Financial institutions are increasingly centralising their systems and processes, requiring large volumes of data to be transferred from remote branches to major data centres. This placed new demands on the infrastructure of service provider iT-AUSTRIA, which delivers data centre services as well as voice and data services to high-profile financial...
- Case studies 2007-10-16
- MobiCam WebCam (exe)
- Use your mobile phone as a Webcam. Connects via Bluetooth. Supports : Nokia N70, N90, 3230, 6600, 6620, 6630, 6260, 6630, 6680-2, 7610; Panasonic X700/X800; Samsung SDH-D720; Lenovo P930. MobiCam is compatible with any Internet telephony systems (Skype, GoogleCall, Yahoo) as well as any Instant Messengers (MSN, Yahoo, ICQ, AIM)....
- Software downloads 2007-09-21
- Public Multi-Vendor Carrier Ethernet Interoperability Test
- A number of technologies are available today to carry Ethernet frames over xDSL lines, point-to-point radio links, PDH, SDH/Sonet and obviously fiber. Ethernet's ubiquity is one of the highlighted reasons for its success. A large number of service providers worldwide plan to upgrade, extend or exchange their metro aggregation networks...
- White papers 2007-09-01
- Single-Layer Cuts for Multi-Layer Network Design Problems
- The paper studies a planning problem arising in SDH/WDM multi-layer telecommunication net-work design. The goal is to find a minimum cost installation of link and node hardware of both network layers such that traffic demands can be realized via grooming and a survivable routing. The paper presents a mixed-integer programming...
- White papers 2007-08-01
- OC-192c/STM-64c and 10 Gigabit Ethernet WAN PHY
- The introduction of 10 Gigabit Ethernet (10 GbE) WAN PHY into the IP/Ethernet networking community has led to confusion over the applicability between 10 GbE WAN PHY and OC-192c/STM-64 interfaces. Both of these interfaces support transmission at 9.6 Gbps, support SONET/SDH framing, and can be connected to SONET/SDH ADM or...
- White papers 2007-08-01
- Extending the Substation LAN Beyond Substation Boundaries: Current Capabilities and Potential New Protection Applications of Wide-Area Ethernet
- Ethernet-based Local Area Networks LANs have become an indispensable tool that promises to revolutionize power system communications. Advances in Ethernet-based technology have taken this industry from shared 10 Mbps LAN segments to switched 100 Mbps LANs followed by 1 Gbps backbones for Metropolitan Area Networks MANs and more recently 10...
- White papers 2007-06-07
- Advanced Intelligence in Cisco Multiservice Transport Product
- The advent of Reconfigurable Optical Add/Drop Multiplexer ROADM technology and mesh optical networks challenges the operating model for transport service providers, with SONET/SDH moving to the edge and even being replaced by Layer 2 and Layer 3 traffic. Traditional point-to-point Wavelength-Division Multiplexing WDM becomes complex all-optical networking, eliminating the need...
- White papers 2007-01-01
- Nortel Network Case Study: Avea
- Avea is a dynamic player in Turkey's mobile communications sector, with 17% of the market subscribing to its services. To maintain its competitive advantage in the fast-growing Turkish GSM market, Avea is planning to evolve its core transport network by deploying high capacity next-generation SDH equipment. Avea's existing infrastructure in...
- Case studies 2007-01-01
- Top Ten Threats for 2007
- Top Ten Threats for 2007RE:Top Ten Threats for 2007I would include...Privacy, Proxy caching, Ajax valnarabilities, Securing RSS feedsTop threat for 2K7... (dramatic pause...)[b]AT&T[/b]The recent FCC approval allowing AT&T to assimilate BellSouth brings the reality of Mutha Bell being handed control of the Internet one step closer, with the government being...
- Discussion threads 2006-12-27
- Metro Ethernet Provision
- Many reasons have made Ethernet today's dominant technology, and it is now making a challenge for the Access and Metro areas. Ethernet has been used for short-range and high-bandwidth networking. Remote site connections have been based on leased lines, FR and ATM; all of them relying on SDH. The challenge...
- White papers 2006-11-01
- Synchronous Ethernet - A RAD White Paper
- As more and more traffic is being delivered in Ethernet format, carriers are realizing the advantages to converging on a pure Ethernet infrastructure, but are not able to do so with Ethernet as presently defined. New ITU-T Recommendations, such as Y.1731 for Ethernet OAM and G.8031 for Ethernet protection switching,...
- White papers 2006-08-22
- Building Packet-Aware Transport Networks
- Service providers must find lucrative new services to generate additional revenue while improving the profitability of their existing services. The arrival of more sophisticated multimedia offerings, including VoIP, IPTV, and related services such as video telephony and gaming present enormous opportunities while at the same time created network challenges. To...
- White papers 2006-06-01
- Optimizing for Network Intra-POP Interconnections With Very Short Reach Interfaces
- Cisco Systems has developed VSR-1 technology, the first functional 10-Gbps SONET/SDH interface that provides a low-cost, standard solution optimized for Very Short Reach VSR optical interconnections. As service providers move to 10-Gbps speeds to meet tremendous increases in traffic loads, VSR-1 helps enable cost-effective scaling of IP networks. Service provider...
- White papers 2006-04-01
- MPLS Over Transport Network: Two Layer Approach to Network Design With Statistical Multiplexing
- The possibility of adding MPLS support to transport networks is considered an important opportunity by telecom carriers that want to add packet services and applications to their networks. However, the question arises whether it is convenient to add MPLS nodes just at the edge of the network to collect packet...
- White papers 2006-02-17
- Evolving Multiservice Metro Networks to Support Next Generation Service Growth
- The market for voice, data, and other network services is changing rapidly as customer processing power and bandwidth requirements continue to grow. Service providers have many options for responding to these changes. However, no service provider wants to continuously reconfigure networks to support the latest service and remain competitive, while...
- White papers 2006-02-01
- Efficient Transport of Storage and Ethernet Across Hybrid DWDM and SONET/SDH Networks
- Proliferation of storage traffic due to disaster recovery and business continuance requirements, combined with the high cost associated with downtime or loss of data, justifies the need for interconnecting geographically dispersed data centers. At the same time, mission-critical applications such as e-business and customer relationship management, and emerging applications such...
- White papers 2006-01-01
- Global metro Ethernet market to reach $26 bln in 2008
- Worldwide metro Ethernet equipment revenue more than doubles between 2004 and 2008, from $3.1 bln to $7.6 bln, totaling almost $26 bln during the five-year period, and ports shipments will more than quadruple, according to Infonetics Research. All this equipment buying is driving the Ethernet services market, which will jump...
- Blog posts 2005-12-06
- SAN Over SDH/SONET for Business Continuity and Disaster Recovery
- Tremendous growth in enterprise storage needs has created demand for reliable and cost-effective backup and data protection solutions. The emergence of storage extension solutions is a natural evolution of the growing use of Storage Area Networks SANs within the enterprise. These solutions provide data connectivity between separate SAN islands within...
- White papers 2005-12-01
Premier Vendor Content Whitepapers, webcasts & resources from our Power Center Sponsors
- ZDNet News Videos
-
Tech news covering the latest in products, conferences and blog commentary, from ZDNet video.
- Watch the latest video >>
- Hardware Assisted Virtualization to Mitigate Security Risks
-
In this podcast Intel's Malcolm Harkins and HP's Manny Novoa chat about the latest issues in security technologies, notably the emergence of hardware assisted virtualization.
- Watch the Podcast on the Intel Open Port General Blog >>
- Learn how collaboration fuels success with this FREE Economist report
-
According to a new study from the Economist, future success belongs to those who collaborate effectively. Learn how successful collaboration can improve profits, problem-solving, and competitive differentiation.
- Visit Cisco's Collaboration Resource Center today!
The Green Enterprise
-
- A look into the enterprise to explore eco-friendly practices and innovations. In this ZDNet video series learn about what's motivating green tech, and how green technologies are impacting IT. 0:42
-
Harnessing the power of waves
3:13
-
Planting solar gardens
5:06
-
Fill your car for $1.10 a gallon?
1:43
- All series videos »
