Showing posts with label 1588. Show all posts
Showing posts with label 1588. Show all posts

Monday, February 2, 2015

Vitesse's 10/40G PHYs Enable Secure WAN with 256-bit MACsec and 1588

Vitesse Semiconductor introduced a new quad channel, 10/40G physical layer transceiver family featuring government-grade, FIPS-197-certified 256-bit MACsec encryption for securing WAN links for enterprise, cloud and mobile backhaul traffic.

Specifically, the new PHYs enable 40G connectivity with “secure 1588” by leveraging Vitesse’s FIPS-certified Intellisec IEEE 802.1AE MACsec security encryption technology and Vitesse’s VeriTime IEEE 1588 timing and synchronization.

Vitesse said the new quad channel 10G PHY family addresses several markets which are prime for MACsec encryption: enterprise and data center networking, where access lines with government-grade protection is required; and Service Provider access networking, where higher capacity, more intelligence and secured Ethernet transport is needed in aggregation service router, mobile backhaul, etc.

Vitesse notes that traditional MACsec implementations are not able to deliver IEEE 1588 timing accuracy, as required in TD-LTE and LTE-Advanced mobile networks.  Its Intellisec and VeriTime technologies deliver line-rate 256-bit encryption with the industry’s de facto highest accuracy IEEE 1588 timing. Intellisec’s “tag-in-the-clear” capability also provides the network transparency needed to enable use of third party networks for delivery of critical services to mobile, Enterprise and Industrial-IoT networks.

Key capabilities of Vitesse’s VSC8256, VSC8257 and VSC8258 include:
  • High capacity 40G connectivity;
  • Highly accurate VeriTime IEEE 1588 network timing; and
  • Flexible Layer 2 security (Intellisec IEEE 802.1AE MACsec) offload for companion network processors, I/O processors, MAC controllers and/or FPGA-based designs.
  • Accelerating Cloud Services to Users and Industry
“Addressing the ‘Snowden effect’ and growing security concerns in our increasingly connected world is critical in next-generation networking equipment,” said Uday Mudoi, vice president of product marketing at Vitesse. “Vitesse’s game-changing technologies readily enable the rigorous security needed to safeguard Enterprise, Cloud and mobile network infrastructures.”

The new 10GE PHY family includes:

  • VSC8256: Serial-quad channel 1G/10G Ethernet retimer and repeater
  • VSC8257: Serial quad channel 1G/10G Ethernet PHY with VeriTime IEEE 1588 timing and synchronization
  • VSC8258: Serial quad channel 1G/10G Ethernet PHY with VeriTime IEEE 1588 timing and synchronization and Intellisec IEEE 802.1AE MACsec

Wednesday, February 26, 2014

Blueprint: Impending ITU G.8273.2 to Simplify LTE Planning

By Martin Nuss, Vitesse Semiconductor

Fourth-generation wireless services based on long-term evolution (LTE) have new timing and synchronization requirements that will drive new capabilities in the network elements underlying a call or data session. For certain types of LTE networks, there is a maximum time error limit between adjacent cellsites of no more than 500 nanoseconds.

To enable network operators to meet the time error requirement in a predictable fashion, the International Telecommunications Union is set to ratify the ITU-T G.8273.2 standard for stringent time error limits for network elements. By using equipment meeting this standard, network operator will be able to design networks that will predictably comply with the 500-nanosecond maximum time error between cellsites.

In this article, we look at the factors driving timing and synchronization requirements in LTE and LTE-Advanced networks and how the new G.8273.2 standard will help network operators in meeting those requirements.

Types of Synchronization

Telecom networks rely on two basic types of synchronization. These include:
Frequency synchronization
Time-of-day synchronization, which includes phase synchronization

Different types of LTE require different types of synchronization. Frequency division duplexed LTE (FDD-LTE), the technology that was used in some of the earliest LTE deployments and continues to be deployed today, uses paired spectrum. One spectrum band is used for upstream traffic and the other is used for downstream traffic. Frequency synchronization is important for this type of LTE, but time-of-day synchronization isn’t required.

Time-division duplexed LTE (TD-LTE) does not require paired spectrum, but instead separates upstream and downstream traffic by timeslot. This saves on spectrum licensing costs but also allows to more flexible allocate bandwidth flexibly between upstream and downstream direction, which could be valuable for video.  Time-of-day synchronization is critical for this type of LTE. Recently TD-LTE deployments have become more commonplace than they were initially and the technology is expected to be widely deployed.

LTE-Advanced (LTE-A) is an upgrade to either TD-LTE or FDD-LTE that delivers greater bandwidth. It works by pooling multiple frequency bands, and by enabling multiple base stations to simultaneously send data to a handset. Accordingly adjacent base stations or small cells have to be aligned with one another – a requirement that drives the need for time-of-day synchronization. A few carriers, such as SK Telecom, Optus, and Unitel, have already made LTE-A deployments and those numbers are expected to grow quickly moving forward.

Traditionally wireless networks have relied on global positioning system (GPS) equipment installed at cell towers to provide synchronization. GPS can provide both frequency synchronization and time-of-day synchronization. But that approach will be impractical as networks rely more and more heavily on femtocells and picocells to increase both network coverage (for example indoors) and capacity. These devices may not be mounted high enough to have a line of sight to GPS satellites – and even if they could, GPS capability would make these devices too costly.  There is also increasing concern about the susceptibility of GPS to jamming and spoofing, and countries outside of the US are reluctant to exclusively rely on the US-operated GPS satellite system for their timing needs.

IEEE 1588

A more cost-effective alternative to GPS is to deploy equipment meeting timing and synchronization standards created by the Institute of Electrical and Electronics Engineers (IEEE).

The IEEE 1588 standards define a synchronization protocol known as precision time protocol (PTP) that originally was created for the test and automation industry. IEEE 1588 uses sync packets that are time stamped by a master clock and which traverse the network until they get to an ordinary clock, which uses the time stamps to produce a physical clock signal.

The 2008 version of the 1588 standard, also known as 1588v2, defines how PTP can be used to support frequency and time-of-day synchronization. For frequency delivery this can be a unidirectional flow. For time-of-day synchronization, a two-way mechanism is required.

Equipment developers must look outside the 1588 standards for details of how synchronization should be implemented to meet the needs of specific industries. The ITU is responsible for creating those specifications for the telecom industry.

How the telecom industry should implement frequency synchronization is described in the ITU-T G.826x series of standards, which were ratified previously. The ITU-T G.8273.2 standard for time-of-day synchronization was developed later and is expected to be ratified next month (March 2014).
Included in ITU-T G.8273.2 are stringent requirements for time error. This is an important aspect of the standard because wireless networks can’t tolerate time error greater than 500 nanoseconds between adjacent cellsites.

ITU-T G.8273.2 specifies standards for two different classes of equipment. These include:
Class A- maximum time error of 50 ns
Class B- maximum time error of 20 ns

Both constant and dynamic time errors will contribute to the total time error of each network element, with both adding linearly after applying a 0.1Hz low-pass filter. Network operators that use equipment complying with the G.8273.2 standard for all of the elements underlying a network connection between two cell sites can simply add the maximum time error of all of the elements to determine if the connection will have an acceptable level of time error. Previously, network operators had no way of determining time error until after equipment was deployed in the network, and the operators need predictability in their network planning.

Conforming to the new standard will be especially important as network operators rely more heavily on heterogeneous networks, also known as HetNets, which rely on a mixture of fiber and microwave devices, including small cells and femtocells. Equipment underlying HetNets is likely to come from multiple vendors, complicating the process of devising a solution in the event that the path between adjacent cell sites has an unacceptable time error level.

What Network Operators Should Do Now

Some equipment manufacturers already have begun shipping equipment capable of supporting ITU-T G.8273.2, as G.8273.2-compliant components are already available. As network operators make equipment decisions for the HetNets they are just beginning to deploy, they should take care to look for G.8273.2-compliant products.

As for equipment already deployed in wireless networks, over 1 million base stations currently support 1588 for frequency synchronization and can be upgraded to support time-of-day synchronization with a software or firmware upgrade.

Some previously deployed switches and routers may support 1588, while others may not. While 1588 may be supported by most switches and routers deployed within the last few years, it is unlikely that they meet the new ITU profiles for Time and Phase delivery.  IEEE1588 Boundary or Transparent Clocks with distributed time stamping directly at the PHY level will be required to meet these new profiles, and only few routers and switches have this capability today.  Depending where in the network a switch or router is installed, network operators may be able to continue to use GPS to provide synchronization, gradually upgrading routers by using 1588-compliant line cards for all new line card installations and swapping out non-compliant line cards where appropriate.

Wireless network operators should check with small cell, femtocell and switch and router vendors about support for 1588v2 and G.8273.2 if they haven’t already.

About the Author

Martin Nuss joined Vitesse in November 2007 and is the vice president of technology and strategy and the chief technology officer at Vitesse Semiconductor. With more than 20 years of technical and management experience, Mr. Nuss is a Fellow of the Optical Society of America and a member of IEEE. Mr. Nuss holds a doctorate in applied physics from the Technical University in Munich, Germany. He can be reached at

About Vitesse
Vitesse (Nasdaq: VTSS) designs a diverse portfolio of high-performance semiconductor solutions for Carrier and Enterprise networks worldwide. Vitesse products enable the fastest-growing network infrastructure markets including Mobile Access/IP Edge, Cloud Computing and SMB/SME Enterprise Networking. Visit or follow us on Twitter @VitesseSemi.

Wednesday, June 19, 2013

RAD Brings Distributed Grandmaster Sync to LTE Backhaul

RAD introduced distributed Grandmaster functionality in its Service Assured Access solution for mobile backhaul networks.

The company said distributed GM is an elegant solution for LTE compared to existing solutions that use GPS at each base station, or for architectures that deploy a Grandmaster clock with IEEE 1588 functionality at a central site to transmit timing across the entire backhaul network to all remote base stations.

RAD’s ETX-2 Advanced Carrier Ethernet device supports 1588 Grandmaster and is also equipped with a built-in GPS receiver.

"Since the ETX-2 is designed to be deployed at the first aggregation point, closest to the cell-site or a cluster of small cells, it will not overcrowd base stations, and since it will typically be situated much closer to base stations than a Grandmaster clock would be, it can provide an accurate reference clock for the base stations with no network upgrade," said Ilan Tevet, Service Provider Line of Business head at RAD.

Wednesday, December 12, 2012

Vitesse and Microsemi Develop 1588v2 Sync and Timing Reference Design

Vitesse Semiconductor and Microsemi Corp. introduced a reference design for implementing IEEE 1588v2 synchronization and timing in packet-based networks.

The reference design uses Vitesse's Serval VSC7418 Carrier Ethernet Switch Engine with VeriTime 1588 technology and Microsemi's ZL30343 SyncE/IEEE1588 packet synchronizer (DPLL) and clock recovery algorithm. The reference design meets the performance demands for timing synchronization in accordance with ITU-T Recommendation G.8262/G.8261 for wireless base stations, radio network controllers, gateways, aggregation and transmission equipment, and routers while reducing design complexity.

"Our jointly developed reference design allows broadband service providers to simplify the implementation of 1588 synchronization and timing technology and streamline the transition to IP Edge networks," said Maamoun Seido, vice president for timing products at Microsemi. "Demand for precise timing and synchronization solutions is growing and we will continue to collaborate with industry leaders such as Vitesse to deliver industry-standard 1588 solutions to meet this need."

"This reference design provides our customers with a proven path to add precision timing needed for carrier access and backhaul networks," said Uday Mudoi, product marketing director at Vitesse. "Vitesse's VeriTime portfolio delivers nanosecond accurate time-stamping for both microwave and fiber networks, which when combined with the Microsemi DPLL and clock recovery algorithm, helps OEMs expedite upgrades to meet 4G/LTE network timing requirements."

Sunday, December 2, 2012

Vitesse Powers Carrier Ethernet 2.0 Access with 1588v2

Vitesse Semiconductor introduced a new Network Interface Device/Ethernet Access Device (NID/EAD) reference design based on its CEServices software and Serval (VSC7418) Carrier Ethernet switch engine.

Significantly, the NID/EAD platform supports MEF Carrier Ethernet 2.0, which is becoming a requirement in many RFPs from network operators.  Vitesse said its design exceeds many of these requirements today, including line rate support for essential service creation and assurance features such as RFC2544, Y.1564, multi-operator OAM and Hierarchical Quality of Service (HQoS).  The reference design also integrates Vitesse’s VeriTime timing synchronization for mobile access deployments.

"This reference design delivers a proven path to future-proof IP Edge and cloud networks for real-time service delivery,” said Uday Mudoi, product marketing director at Vitesse. “Service-awareness and manageability are key to guarantee the security, performance and access required for business cloud services. Vitesse remains committed to advancing carrier-class networking for IP Edge and cloud computing.”

Pulsecom is introducing its new SuperG Ethernet NID platforms using Vitesse’s Carrier Ethernet Switch Engine. The CE 2.0-compliant SuperG access/aggregation platforms are designed for mobile backhaul, business services, as well as access and aggregation network and demarcation applications.

Pulsecom, whose customers include many of the large U.S. operators, said it is seeing a definite requirement for Carrier Ethernet 2.0 and IEEE 1588v2 capabilities.

Pulscom’s SuperG Family Highlights:

  • SuperG Multiservice Access Switch: Ethernet and DS1 access solution supporting multiple generations of cell site backhaul and evolving business service requirements; 
  • SuperG NID: CE 2.0-ready Ethernet access solution optimized for cell site and customer premise applications requiring MEF-compliant Ethernet services; and
  • SuperG OSP: CE 2.0-ready access solution optimized for outdoor use.
  • Pulsecom's scalable solutions for Carrier Ethernet access and wireless backhaul deliver MEF compliant Ethernet services to custom fit any mixture of 1G, 2G, 3G and 4G/LTE applications.

Monday, August 6, 2012

Vitesse Builds Momentum with 1588v2 Timing for Backhaul

Vitesse Semiconductor has captured multiple design wins with nine of the market share leaders in the IP Edge microwave/millimeter-wave backhaul networking equipment space. The company calculates that these OEM customers account for nearly 60% market share in the microwave backhaul and 75% in the millimeter-wave backhaul segments.

Vitesse's VeriTime distributed timing technology ensures the highest accuracy IEEE1588v2 timing for IP Edge networks. Vitesse's recent presentation of performance results to the ITU-T documented VeriTime's better than 3ns per node accuracy over a nine-node IEEE1588v2 Transparent Clock (TC) network chain and superior long-term phase stability, making it the industry's only solution that fulfills TD-LTE and LTE-Advanced (LTE-A) requirements in real-world tests today.

"Timing accuracy requirements for 4G/LTE-A/TD-LTE are at least six times more stringent than for 3G," said Pat Diamond, timing industry veteran and pioneering member of the IEEE1588-2008 PTP Working Group, of Diamond Consulting. "Clearly, network equipment OEMs recognize this fact. Given the rigorous level of timing accuracy for LTE networks simply to function, solutions like Vitesse's VeriTime enable OEMs to future-proof their equipment for tomorrow's wireless backhaul networks."
VeriTime 06-Aug-12

Wednesday, August 1, 2012

SiTime Signs Investment and Sales Deal with Vectron & Knowles Electronics

SiTime, which offers MEMS-based silicon timing solutions that replace legacy quartz products, announced a strategic partnership with Vectron International and Knowles Electronics. The partnership brings a cash investment by Vectron and Knowles. 

In addition, both Vectron International and Knowles Electronics will sell MEMS timing products through their own direct sales channels, as well as support SiTime with future product developments. 01-Aug-12

Thursday, July 26, 2012

Analog Devices Intros Programmable Dual Clock for OTN

Analog Devices introduced a fully-programmable, jitter-attenuating, dual-clock translator IC for optical transport network (OTN) applications and high-density line cards. The AD9559 quad-input multiservice line card adaptive clock translator simultaneously supports different standard frequencies for wired communications applications, including synchronous Ethernet, SONET/SDH, 1/10/100G Ethernet, Fiber Channel, and other applications that require low jitter, flexibility and fast time-to-market.

The AD9559 translator IC synchronously converts any standard input frequency to any standard output frequency at up to 1.25 GHz with sub-400-fs RMS (root mean square) total jitter over a 12-kHz to 20-MHz integration bandwidth. The AD9559 replaces two synchronous timing devices with a single IC, helping designers with board space constraints and cost optimization.

Tuesday, July 24, 2012

Vitesse Intros SynchroPHY for 1GE, 10GE and 10GE OTN

Vitesse Semiconductor unveiled its SynchroPHY portfolio of 1 GigE, 10GE and 10GE OTN PHYs. The chips feature Vitesse's VeriTime, its patent-pending distributed timing technology that delivers high accuracy IEEE1588v2 timing for IP Edge networks, the SynchroPHY portfolio offers the industry's broadest and most scalable solution supporting timing needs for Ethernet, microwave and OTN networks.

"Our SynchroPHY family enables sub-10 nanosecond accurate timing through a simple upgrade of PHYs in existing routers and switches," said Richard Interrante, product marketing director at Vitesse. "With Vitesse's unique architectural approach, VeriTime-enabled solutions achieve the in-line speed and scalability crucial to the functionality of 4G service provider networks."

Wednesday, July 11, 2012

Vitesse Samples Low-Power, 11-port GigE Switch with 1588v2

 Vitesse Semiconductor introduced an 11-port Gigabit Ethernet switch targeted at low power Industrial Ethernet and Enterprise applications.

The VSC7414 chip is optimized for power-sensitive enterprise router applications and dissipates only 1.6W – 75% lower than the competition, according to the company. It supports more than eight queues per port along with priority flow control (IEEE 802.1Qbb) mechanism for advanced Quality of Service (QoS). It also incorporates Vitesse's VeriTime IEEE1588v2 technology. The VSC7414’s support of the nanosecond-accurate synchronization in IEEE1588v2 network timing also makes it ideal for utility/smart grid and emerging Audio Video Bridging (AVB) applications where precision timing is required.

“Similar to Carrier networks, Enterprise networks are converging on Ethernet,” said Uday Mudoi, director of product marketing at Vitesse. “This raises the importance of IEEE1588v2 network timing as the data center becomes packet-based. Our customers focused on Industrial Ethernet and Enterprise networking can now leverage Vitesse’s highly accurate IEEE1588v2 VeriTime technology, already adopted by dozens of telecom customers for mobile backhaul applications.”

Vitesse's VeriTime Delivers High Accuracy 1588v2 Timing for LTE-Advanced

Vitesse Semiconductor unveiled its "VeriTime" distributed timing technology for the highest accuracy in IEEE1588v2 timing for IP Edge networks. The VeriTime technology, which is already incorporated in nearly a dozen Vitesse products, including Carrier Ethernet Switch Engines and SynchroPHY portfolio of 1 Gigabit Ethernet (GE), 10GE and 10GE OTN PHYs, ensures a firmware upgrade path for meeting the more stringent timing requirements of LTE-Advanced (LTE-A).

IEEE1588v2 is widely expected to become the defacto packet synchronization standard for cell sites.
Vitesse's VeriTime eliminates the need for discrete timing FPGAs, processors, and software timing synchronization solutions in the cost-sensitive Edge and Access equipment. It supports both Boundary Clock (BC) and lower cost TC implementations of the IEEE1588v2 standard.

Vitesse recently reported network performance results to the ITU-T documenting VeriTime's < 3ns per hop accuracy over a nine-hop IEEE1588v2 Transparent Clock (TC) network, making it the industry's only solution that fulfills TD-LTE and LTE-Advanced requirements in real-world tests .
Vitesse also noted that VeriTime now includes components for implementing IEEE1588v2 timing over microwave links, overcoming latency variations due to weather and changes of modulation scheme.

"VeriTime represents Vitesse's fifth generation of IEEE1588v2 IP and is a significant architectural advancement towards providing GPS-grade timing over the network without sacrificing systems margin," said Martin Nuss, chief technology officer for Vitesse. "Based on our incumbency with dozens of telecom OEMs, VeriTime is quickly becoming the de facto solution in mobile networks."

Monday, June 25, 2012

Symmetricom Intros Small Cell Synchronization Solutions

Symmetricom introduced new embedded timing and synchronization solutions for residential and enterprise small cells.

Two versions are offered: the SCr (residential) and SCe (enterprise) SoftClocks, both of which support multiple timing protocols including IEEE 1588 (PTP), network time protocol (NTP) and softGPS. Both have been integrated and proven with leading processors, system software, and oscillators from prominent vendors such as Broadcom, Mindspeed, Qualcomm Atheros, Node-H, and Rakon.

Symmetricom said synchronization of small cells along with macro base stations is crucial to maintaining seamless end-user experience. Its software based SoftClock offerings allow small cell designers to execute a single base design with options to integrate one or more synchronization protocols for deployment in varied network topologies. This means multiple types of backhaul and quality of service can be supported.

Sunday, April 29, 2012

SiTime Hits MEMS Milestone: 100 Million Timing Devices Shipped

SiTime Corporation, which specializes in silicon MEMS timing solutions, announced a major milestone: cumulative shipments of its MEMS oscillators, clock generators and resonators have exceeded 100 million units.

Over 800 electronics companies have adopted SiTime’s Silicon MEMS timing solutions in more than 100 unique applications.

“SiTime’s unique MEMS and analog technology is transforming the decades-old timing industry with revolutionary products that offer unsurpassed performance, flexibility and reliability,�? said Rajesh Vashist, CEO of SiTime. “Our silicon-based technology has enabled dramatic advances in performance that have not been replicated by the quartz industry. Today, our products are 250 times better in stability and jitter than our first product in 2007, and we continue to innovate at this accelerated pace. In addition, SiTime’s MEMS timing products are up to 500 times more reliable than quartz oscillators. Almost every major electronics company has either shipped product with our MEMS solutions or is evaluating them and it is only a matter of time before volumes of MEMS oscillators will exceed that of legacy quartz oscillators."

Tuesday, April 24, 2012

Broadcom Intros Four Energy Efficient Ethernet (EEE) PHYs

Broadcom has added four energy efficient chips to its Energy Efficient Ethernet (EEE) portfolio.

The new 10/100/1000BASE-T physical layer transceivers (PHYs) lower operating power by more than 40 percent, and up to 70 percent or more through the implementation of EEE directly at the physical layer. The PHYs also feature Broadcom's AutoGrEEEn technology, which enables systems with legacy MACs to leverage the power savings of EEE in periods of low link utilization. This allows customers to transform existing network equipment to EEE-compliance simply by changing the PHY device.

In addition to reducing power consumption and energy costs, Broadcom said its new PHYs provide integrated on chip 1588 PTP and Y.1731 delay measurement for timing synchronization and latency measurement — critical features for service provider and industrial Ethernet applications.

All devices are now sampling with production volume slated for the second half of 2012.

Tuesday, June 28, 2011

Zarink Delivers IEEE 1588 enabled SyncE Silicon

Zarlink Semiconductor introduced new single-chip timing products capable of delivering IEEE 1588 enabled SyncE synchronization solution.

Wireless network operators can use both SyncE and IEEE 1588 technologies simultaneously. SyncE delivers highly accurate and stable frequency references using the physical Ethernet connections. In combination with this, IEEE 1588 distributes time of day and time alignment functionality.

Zarlink's new ZL30342, ZL30343 and ZL30347 IEEE 1588 enabled SyncE devices deliver the required synchronization in a small form factor package. In comparison, competing approaches require external components to generate a reliable frequency reference or rely on expensive GPS systems to provide time of day information.

"Our new timing products are the industry's first single-chip IEEE 1588 enabled SyncE PLL devices," said Louise Gaulin, vice president of Zarlink's Timing and Synchronization product group. "Our complete approach provides carriers with well established synchronization from SyncE, together with time alignment provided by IEEE 1588. This approach is critically important for wireless operators as they plan a cost-effective migration to packet-based backhaul to support the huge increase in multimedia traffic generated by smartphones and tablets. These new solutions are a key addition to our product portfolio, and are winning designs with customers that will help drive continuing revenue growth for our timing business."