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At first glance ADSL Technology

ADSL stands for Asymmetric Digital Subscriber Line, a technology that enable high-speed data is sent through the phone wires. ADSL allows to receive data up to 1.5-9Mbps speeds (downstream speed) and send data at a speed of 16-640Kbps (upstream rate).

ADSL divides the frequency of connection used with the assumption that most Internet users will be mainly taking (downloading) data from the Internet instead of sending (upload) to the Internet. Therefore, the speed of data from the Internet usually about three to four times the speed of the Internet. Because the upstream and downstream speeds are not just used the term Asymmetric.

There are several references that can be used to find out more about ADSL technology, some of them are,

http://www.dslforum.org/index.shtml - ADSL Forum
http://electronics.howstuffworks.com/dsl.htm - How does DSL
http://www.cs.tut.fi/tlt/stuff/adsl/pt_adsl.html - Intro to ADSL technology
http://www.rhapsodyk.net/adsl/HOWTO/ - ADSL on Linux
http://www.kitz.co.uk/adsl/adsl.htm - Encyclopedia ADSL

Some advantages ADSL

You can connect to the Internet, and can still use the phone to receive / call.
Much higher speed than ordinary modems.
Do not need a new phone cable, ADSL allows use traditional telephone lines available.
Bebrerapa ADSL ISP will provide an ADSL modem as part of the installation.

Some losses ADSL.

ADSL connection will work perfectly if the location we are close enough to the telephone exchange. At least within a 2-3 km stretch of cable is usually quite safe to use ADSL to the speed of about 8Mbps. The new DSL technologies may be able to deliver very high-speed s / d 100Mbps, certainly for a very short distance.
ADSL connection is much faster for receiving data than sending data over the Internet.
The old copper wires can reduce the quality and lower speed connections.
There is no ADSL service in areas that do not have cable phone.

Varian DSL - xDSL

Of course, many variants of DSL technologies, some of which are

Family ITU Ratification Name Speed Max.
G.992.1 ADSL G.dmt 1999 7 Mbps down, 800 kbps up
ADSL2 G.992.3 G.dmt.bis 2002 8 Mb / s down,
1 Mbps up
ADSL2plus G.992.5 ADSL2plus 2003 24 Mbps down, 1 Mbps up
G.992.3-ADSL2 Reach Extended RE 2003 8 Mbps down
1 Mbps up
SHDSL G.991.2 G. SHDSL 2001 5.6 Mbps up / down
G.993.1 VDSL Very-high-data-rate DSL 2004 down 55 Mbps, 15 Mbps up
VDSL2 G.993.2, Very high-data-rate DSL 2 2005 100 Mbps up / down

Always highly skilled server Mahal ... ... ....?

Cost and performance factors are the most important factor that many of the barriers to customers using large servers Intel processor-based. A similar wedge makes high-processor-capable hard to get into mainstream corporate data centers. With the new standard architecture IBM initiated the impression of an expensive high-capable servers to ditepis by IBM, successfully?

IBM eServer exactly is a pioneer in creating a reliable architecture with a "building block". With this approach it is possible for customers to pay in stages according to their needs.

The maximum capacity of these servers is 16 processor with the memory capacity reaches 64-GB. Major vendors in general offer systems with the scale and seperduanya just can not be developed further, or their customers require large investments since the beginning of construction of the system is often burdensome. other than that this latest eServer architecture also uses the open approach (proprietary) to be more flexible.

The latest IBM server systems that are capable, IBM eServer x440 is equipped with X-technology Enterprise Architecture (exa). This server is the result of the development effort for 3 years from IBM to create a server based on Intel's board which uses industry-standard technologies and have the ability to run the core applications that drive e-business.

The best flexibility for E-business

IBM eServer x440 is targeted for e-business where these machines can be used as a single large-scale servers that may run large databases or servers with the ability to support a number of virtual servers to consolidate smaller, for example, some e-mail servers, into one server only with the aim of lower cost. eServer x440 supports operating systems Microsoft Windows and Linux in an SMP configuration, in addition to having the capability to support up to four physical partitions or up to 64 virtual partitions. eServer x440 provides a platform for the consolidation of servers and applications for large-scale single system such as a database engine for business intelligence.

Driven by technology, Enterprise X-Architecture from IBM, the system can grow up to 16 processors Intel IA-32 Xeon MP twice as many
compared with the closest competitor and four times more than most other systems.

Intel Xeon MP processors to implement the three-level cache architecture is unique, which allows the processor to access data that is often
used with greater speed than before, while improving overall system performance, the performance of back-end applications and shorten the response time in a large number of database applications and customer management.

Intel Xeon MP processors also achieved the performance level of the Front Side Bus 400-MHz, which means the data is sent out and received by the processor with
speed of 3.2-GB per second. This is a substantial improvement of the speed of 1.06 GB per second, provided by the design of the Pentium III processor
using speed Front Side Bus 133-MHz.

These processors also use a technology called Hyper-Threading, which allows the server software for multi-threaded
perform some tasks in parallel within each processor, thus allowing the use of the resources of independent processors
simultaneously and more efficiently.

IBM, as revealed by Suryo Suwignyo, Country Manager, Enterprise Systems Group, IBM Indonesia hopes the introduction of these technologies could become a new era where technology and the ability to create systems that are robust to be very important. As said Suryo, a clever vendors in assembling the components available in the market will be challenged to provide the level of scale and reliability demanded by customers who need systems like this for their business infrastructure.

Innovation shown

XpandOnDemand: By providing scalability features or 'shopping only when the engine wants to improve its ability (XpandOnDemand) will help users accommodate business growth is not unexpected. As a configuration option "pay growth needs" a simple, XpandOnDemand is an alternative to supply from other vendors complex and expensive. Businesses can start with a 4-way system, then increase the computing capacity to support the systems with 16 processors by using the addition of 4 processor modules as needed. Communication between these modules take place with
very high speeds, namely 3.2 Gigabit per second, which offset speed processors on this server.

High Performance Scaling: With the scalability of 66% of the SAP 2-tier 4-way to 8-way, x440 performance demonstrated leadership capabilities in running a real application (real-world). Driven by the Cache Accelerator XceL4TM new server, which places frequently used data closer to the microprocessor to obtain a better throughput, xSeries 440 is optimized for peak performance for applications e-business solutions to mission-critical such as databases, CRM, ERP and business intelligence.

Density: Intel-based servers with the large-scale density (density) is highest in industridengan compact form factor 14 inches (8U) which can accommodate 16-way servers in the space of only a fifth of Unisys servers that become rivals. 7U systems from 8-way Compaq, Dell and HP has the highest density 75% lower than the 8-way systems eServer x440 IBM.

Workload Consolidation: Partition system allows a 16-way server running one operating system or divided into up to 4
partition servers 'physical' and the virtual partition with 64 devices (tools) software from VMWare ESX Server is running combinations Microsoft or Linux applications.

Repair Technology From Within eliza: Active Memory with Memory Memory mirroring and ProteXion that help keep the systems
continue to work despite the damage occurred in the past will make Intel-based systems do not work anymore. Features a sophisticated self-healing such as Real Time Diagnostics, Software Rejuvenation and Chipkill technology helps predict and correct potential problems without having to sever its ties to a network server or servers broken off. IBM eServer x440 comes complete with IBM Director, a systems management solution is integrated and is based on industry standards. IBM Director supports multiple protocols and platforms.

Remote I / O (RIO): The ability to connect PCI-XI / O in the amount of three times greater than competitors' systems that use technology borrowed from UNIX systems eServer pSeries top of IBM. Remote I / O allows 12 slot PCI / PCI-X to add a few yards outside the server via a port high-speed interconnect in order to improve the reliability and flexibility in adding the equipment I / O as a means of data storage and network controllers, fax / modem or cards network interface specifically for
telecommunications environment.