Bài này mô tả tóm tắt tình trạng chuẩn hóa hiện thời của các tiêu chuẩn ứng dụng cho công nghệ Metro Ethernet trong mạng cung cấp dịch vụ viễn thông. Bản thân Ethernet khi thiết kế là được hướng tới hệ thống mạng LAN.
Today’s successful cable operators are ramping up their
networks to deliver advanced services—HD video-ondemand
(VOD), tiered high-speed data, voice-over-IP
(VoIP) and commercial services. MSOs are focused on
improving network reliability and customer satisfaction,
and understand the importance of “carrier-class”
infrastructure. In order to reach the highest level of
delivering the extremely reliable services customers
expect, MSOs must begin thinking about the “ideal
ADC’s LoopStar 745 and LoopStar 745P provide the ideal solutions for delivering cost-effective, managed
Ethernet over DS3 applications. These plug-and-play solutions deliver carrier-class performance allowing
service providers to deliver low-cost, first-entry solutions for single customer scenarios.
The LoopStar 745 and LoopStar 745P can attach to an existing SONET Add Drop Multiplexer (ADM), DS3 fixed
wireless link, or a leased DS3 facility. Two subscriber Ethernet ports enable prioritized traffic to be fed to the
As the Navy builds the last of its Nimitz-class carriers, it asked RAND to study the trade-offs involved in accelerating the production of its new CVN 21 carrier while hastening the retirement of some of the Nimitz fleet. What are the trade-offs involved in terms of cost, capability, and fleet size? RAND researchers looked at the Navy
For Ethernet services to fully deliver on the promise of lower costs and higher reliability, remote management of the network becomes essential—especially as subscriber numbers increase. Remote isolation of troubles and performance monitoring are minimum requirements for carrier-class Ethernet service.
Today’s cable systems serve up more than just television. Because community
antenna television (CATV) systems now incorporate high-speed data and
telephony services, signal flow is critical for multiple systems operators (MSOs)
and their customers. Signal levels and network configurations must evolve
to meet the new service demands of transitioning headends. The impending
challenge for MSOs is to effectively manage their networks amid change and
maintain maximum uptime for subscribers.
Juniper Networks EX4500 Ethernet Switches provide high performance, scalable
connectivity, and carrier-class reliability for high-density environments such as
campus-aggregation and data-center networks.You can manage EX4500 switches using the same interfaces that you use for managing
other devices running the Juniper Networks Junos operating system (Junos OS)—the
command-line interface (CLI) and the J-Web graphical interface
StarGazer® is the ADC element management system for PG-FlexPlus products. StarGazer is a
comprehensive, carrier-class management solution, supporting essential features from all the TMN FCAPS
management functions. StarGazer’s comprehensive and highly intuitive graphical user interface (GUI) is
fully compatible with the PG-FlexPlus SNMP management interface. StarGazer also provides full access to
the native PG-FlexPlus craft port screens and includes an integrated SNMP MIB browser.
Cd1-xMnxS nanoparticles (NPs) with size quantum confinement belong to the diluted
magnetic semiconductor (DMS) quantum dot (QD) class of materials that has been widely
studied in the last few years. The study of quasi-zero-dimensional Diluted Magnetic
Semiconductors (DMS), such as Cd1-xMnxS Quantum Dots (QDs), is strongly motivated due
to the localization of magnetic ions in the same places as the free-like electron and hole
carriers occurring in these nanomaterials [1,2].
The 71-76 and 81-86 GHz bands (widely known as “e-band”) are permitted
worldwide for ultra high capacity point-to-point communications. E-band
wireless systems offer full-duplex Gigabit Ethernet connectivity at data rates
of 1 Gbps and higher in cost effective radio architectures, with carrier class
availability at distances of a mile (1.6 km) and beyond.
“Within the metro will be the need to install, test, and reconfigure all types of
equipment with the same fundamental operational procedures and principles used
in large, carrier-class networks historically. Any other approach is inherently risky.”
PG-Plus® is a cost-effective subscriber carrier system that derives 2, 4, or 6 lines from a single
copper pair. ADC’s proven HDSL transmission technology provides reach 20% beyond that of
traditional Digital Added Main Line (DAML) solutions.
PG-Plus installs in minutes due to line powering and its plug-and-play design. Its unique
architecture supports POTS, UVG, DDS, ISDN, P-Phone, CLASS features, enhanced MLT
testability and network management all from the same platform.
The ADC OptEnet™ Optical Extension Platform is a carrier-class, intelligent, scalable platform
capable of handling any network’s Ethernet or SONET media transitions. Bridging the gap
between legacy copper infrastructures and fiber growth, the OptEnet platform provides the most
economical evolution path. Integrated intelligence allows the user to remotely monitor system
performance and transmit alarm conditions to upstream operational support systems.
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Immunostimulatory effects of three classes of CpG oligodeoxynucleotides on PBMC from HCV chronic carriers...
Recent studies on type II thioesterases (TEIIs) involved in
microbial secondary metabolism described a role for these
enzymes in the removal of short acyl-S- phosphopantetheine
intermediates from misprimed holo-(acyl carrier proteins)
and holo-(peptidyl carrier proteins) of polyketide synthases
and nonribosomal peptide synthetases.