As we all know, the Ethernet technology closely associated with the routing technology systems, then how the Gigabit Ethernet technology to support the development of a new generation of cable, in particular the agreement of the six cables for?
■ Gigabit Ethernet cabling you need six
Currently the industry on the need for wiring cabling six arguments are many, I remember when the three types of wiring in 1992, the prevalence of the five types of wiring only just proposed, is to run cheap 10Mbps Ethernet (10 Base-T) and 25Mbps ATM LAN wiring in three categories based on the developed. When the Ethernet's bit rate to 100Mbps, ATM LAN growth of 155.5 Mbps, the order on the basis of three types of cabling to support these local area network technology, electronic equipment have increased the complexity and cost. 100Base-T4, 100Base-T2 and 155.5 Mbps CAP64 ATM LAN requires the use of sophisticated DSP technology to overcome the limitations of three types of wiring. With the five categories of cabling used by many end-users, low-cost 100Mbps (100Base-TX) Ethernet and 155.5Mbps NRZ ATM local area network has been developed and wiring in the five categories on the basis of better performance.
Reality show: using three types of wiring running 100BASE-T4 when the full cost of each user connection (for example, from the router to the network card, including cable included) for 246 U.S. dollars, and in five categories based on the wiring only 100Base-TX costs 198 U.S. dollars, compared to the average user to connect 24% cost savings.
There is no doubt that the same development will occur again in 1000Base-T LAN technology, due to 1000Base-TX uses two pairs of wire designed to send, receive two pairs of work, so do not full-duplex mode, the echo cancellation. In order to shorten time to market, will choose 100Base-TX uses MLT-3 encoded, MLT-3 bandwidth efficiency of 4 bits per hertz, so a bandwidth of 125MHz. This is a good limit to six types of cabling and PSNEXT NEXT within the offset is therefore unnecessary crosstalk. The level of the current semiconductor technology point of view, do not use the device will return to spread to at least offset the reduction of crosstalk 1000Base-TX, 50% of the overall design complexity (with the current design compared to 1000Base-T).
By extension, if the data rate from each of the 500 Mbps up to 600 Mbps, then this design can be used for 1.2 Gbps systems. Therefore, the six types of cabling to support Gigabit Ethernet can not only reduce the cost of electronic equipment, but also for the future may exceed 1Gbps LAN technology provides infrastructure protection.
Cabling infrastructure investment would be considered a long-term investment, cabling facilities themselves should be an asset. According to the international cabling standards ISO 11801, the life expectancy of a wiring system at least 10 years. During this time, PC technology has made great development. For now, the desktop system, although the demand has not used 1Gbps, but this was mainly due to the internal PC bus architecture limits the current result, because the bus decided to processors and memory and other peripheral devices (such as network card) data exchange between rate. Moore's Law predicts that the number of transistors on a chip every 18 months doubled. This is often used to describe the growth rate of PC processor performance, that is, over 18 months for each PC's performance should be doubled. And so on, in the wiring system life cycle, 1000Base-TX technology to the desktop is very possible.
■ Gigabit Ethernet How to wiring
Well integrated distribution system is to protect the system's success, designers fully understand the end-user computer network users and business applications based on the needs of the overall framework of integrated wiring system to plan, to reflect the user's actual design demand for integrated wiring system diagram. In building design must take into account the integrated wiring system ducts to and space, between the weak and weak position well, weak system should be designed for the computer mainframe room, telephone switch room location and leave enough space for the business sector, information points The distribution of the number and location should be determined as soon as possible to discuss with the end user.
In addition, the integrated distribution system according to the computer network transmission rate, bandwidth and application requirements, in accordance with international and European standards cabling system cabling system products (cable, connector) rating, specifications proposed regulations, should also be considered cabling system-user environment on the security, confidentiality requirements, consider the use of flame-retardant, non-toxic and shielding products. Currently, most of the cabling system project with Europe and the United States more well-known brand of cabling products. Cabling System products, select the main wiring should be considered whether the products meet the international and European standards for cabling systems, computer networks and business applications to meet the integrated wiring systems. Be based on actual user needs and design products and suppliers for inspection and testing.
The implementation of an integrated cabling system is the key to achieve system design requirements, while the user works in the whole implementation process and the weak system, integrated wiring system, the construction approach the first, ending at the latest, and construction, electric and other weak systems most aspects of coordination and cooperation, therefore, integrated wiring system of the construction team must have the appropriate construction qualification, construction workers should have a good quality. Meanwhile, the project manager must be integrated wiring system, all aspects of construction planning, supervision and guidance to ensure that the cabling system on time, according to design requirements of high quality.
In project management, should the following situation often encountered in engineering attention: first, cabling system design drawings, construction and installation drawings and fine decoration are the same drawings, design drawings, if not timely release updates to the system will occur each system with the problem, leading to rework, causing increased costs, delayed schedules. Secondly, the design change would affect the progress of works and cost estimates, any project encountered inevitable change, but change must be carefully made, and must follow the formal process. At the same time, the system's progress with, site coordination and product arrival, storage and systems on-site protection should not be ignored.