The practical application in optical fiber network determines the performance requirements of fiber optic technology. For short-range optical transmission networks, the focus is that multi-mode fiber is suitable for laser transmission and wider mode bandwidth to support greater serial signal information transmission capacity. The following is the introduction to the current three kinds of network technology:
FDDI / CDDI (Fiber/Copper Distributed Data Interface)
FDDI/CDDI is a mature, non-carrier-aware, 100M bandwidth-sharing network technology. Using a token delivery service strategy, the main ring and vice ring are associated between the network equipment and have strong self-restructured capacity after the network lines or network equipment’s failure. At the same time, its station management (SMT) function is very powerful, suitable for the backbone network. But its technical difficulty is high, expensive, poor scalability with circulated wiring, and is not compatible with ATM.
ATM(Asynchronous Transfer Mode)
This is an advanced asynchronous mode with fiber-based transmission system using the statistical multiplexing technology and short cell switching technology. It directly supports data, video, audio and other multimedia transmission. The rate is quite fast (reaching 155M, 622M), due to the use of asynchronous mode, the efficiency is quite high, more suitable for the backbone network.
Fast Ethernet is practical (compatible with the original Ethernet, rich software and hardware), advanced (fast – 100MBPS), easy to upgrade (convenient to ATM or faster network conversion), good scalability (through the interconnect device, switches, routers easy to expand), good opening (open hardware and software protocol), cheap (compared to ATM, FDDI), supports the manufacturers and more features. For multimedia network applications, fast Ethernet can also meet the requirements.
1. Full twisted-pair structure cabling (fast Ethernet technology)
This program refers to that the entire cabling system uses Cat5 twisted pair with fast Ethernet technology in the network technology.
Advantages: cabling cost and network equipment are cheap with easy management; fast Ethernet technology is quite mature, and its exchange is in the second layer, without human intervention.
Disadvantage: if the floor is high, it may lead to the wiring length of more than 100 meters in some of the residence points. We all know that, according to the principle of wiring, twisted pair is generally not allowed more than 100 meters, which will cause the signal attenuation and distortion. Second, because all the wiring lines make radiation from the central room through the vertical subsystem to the other floor, the shaft requirements are higher. And then the full twisted pair structure is difficult to upgrade to ATM technology or Gigabit Ethernet technology that need to use single-mode / multi-mode fiber to connect to form the trunk.
2. Cabling structure of optical fiber forming a vertical trunk, twisted pair as the edge (ATM technology)
The vertical subsystem of this program uses fiber structure, and the other subsystem uses five types of twisted pair wiring. Network technology is ATM technology.
Advantages: first, wiring cost is cheaper. Second, the vertical subsystem is greatly simplified, just making radiation fiber from the central room to the other floor. Each floor is assigned a fiber (preferably adding backup line), using five twisted pair cabling in each floor, which reduces complexity of wiring time and space and eliminates the problem of 100 m length limitation since the fiber is not limited by short distance. The direct use of advanced ATM switching technology follows, which will greatly improve the network response speed.
Disadvantages: mainly, network equipment and host equipment are quite expensive.
3. Cabling structure of optical fiber forming a vertical trunk, twisted pair as the edge (Fast Ethernet technology)
The vertical subsystem of this program uses fiber structure, and the other subsystem uses five types of twisted pair wiring. Network technology is Fast Ethernet technology.
Advantages: wiring cost is cheap; network equipment cost is reasonable; host equipment also needs no special configuration; easy to upgrade. And Ethernet switching technology is without human intervention. The implementation is automatic exchange, easy for management. And when you need to upgrade to ATM or Gigabit Ethernet technology, you only need to replace the network equipment, no need to replace the wiring equipment, truly achieving “a wiring, life-long” target. But when the system needs to be upgraded, you must replace some of the network equipment.
The above three programs of complex cabling have their advantages and disadvantages. However, from the network hardware equipment, taking into account the relationship between performance and price as well as the future upgrades and maintenance, the third cabling program is more reasonable and scientific in the current network technology. The starting point is to use a reputable source like a trusted world-class supplier, who supply FTTX and Data center solutions https://www.cozlink.com/ who not only supply all above cables but also manufacture 10Gbase SR SFP+ transceivers.