Bandwidth is a relative description that encompasses the concept of bandwidth. The larger the range of frequencies, that is, the higher the bandwidth, the greater the relative increase in data that can be sent.
Bandwidth is a description of the signal or electronic circuit that contains or can simultaneously handle a wide range of frequencies, and bandwidth is one of the indicators that identifies the performance of the bus and memory.
Broadband devices generally contain optical cats (optical modems), routers, switches, routing cats.
1, optical cat or ADSL dialer, they are generally provided by the broadband service provider itself, without the user to buy.
2, wireless router, used to give so that more computers and cell phones can share broadband Internet access. Because if you only have a light cat or ADSL dialer, you can only achieve a computer Internet access.
3, network cable, if your broadband used a light cat or ADSL dialer, and there are desktop computers, then at least 2 network cables, 1 cable to connect the router and off the cat or ADSL dialer, another cable to connect the computer and the router.
4、Network set-top box with Internet access, QQ, shopping, games and other functions. Direct Internet access with the TV is also possible;
5, wireless hotspot function, connected to a wired network cable, after setting the set-top box can also be used as a wireless router like transmitting wireless hotspot.
What equipment is needed for broadband to work
1、Router: It is the gateway of home LAN to the Internet and plays the function of data forwarding. It is the core equipment of the whole network.
2、Switch: This device is not a necessary device in our home, mainly used when the router’s own ports are not enough, you can choose a 100 or gigabit switch in your home. Such switches.
3, AP and AC:
(1), AP that is, the wireless access point, simply put it can be wired network into a wireless network for the use of wireless-enabled devices, it can be understood as a wireless switch. AP is divided into fat AP (fat) and thin AP (fit), fat AP each device has an operating system similar to a router, you can set up a separate network, thin AP choose no similar system, mainly with AC. Mainly used with AC. By AC unified management and settings.
(2), AC that is, the wireless controller, which is used with the thin AP to form a wireless network, used to manage the thin AP, configure the wireless network. Similar to the nerve center of the human body — “brain”.
4, network cable: that is, twisted pair, it is four pairs of two pairs of twisted with desperate outer skin of copper wire, is an important network transmission medium. It has many types and types, including Category 5 (CAT5), Category 5 (CAT5E), Category 6 (CAT6), Category 6 (CAT6A) and Category 7 (CAT7), etc. We generally use more CAT5E and CAT6 cables in our homes. Of course, if the budget can be or have other needs, CAT6A or CAT7 would be better, but its requirements are higher in all aspects, you can check its technical parameters and installation requirements online, the length is long, so I will not be introduced. Super Category 5 can support 100 Gigabit network, Category 6 can support Gigabit network, 6A and Category 7 can support 10 Gigabit network, the above cables are backward compatible.
5, other accessories: here are mainly crystal heads, network modules, information panels and other materials.
(1) crystal head and network module, according to the type of network cable you put in place to buy, such as you put in the super five network cable, then you buy super five crystal head or super five module.
(2) information panel, the size is generally 86 type, the number of interfaces have a single port, dual-port, 4-port, can be purchased according to needs.
What equipment is needed for fiber to the home
A, OLT introduction
OLT: optical line terminal (optical line terminal), used to connect the trunk terminal equipment. olt is the core component of the optical access network, equivalent to the traditional communication network switches or routers, but also a multi-service delivery platform. It is generally placed at the bureau end to provide the fiber optic interface of the user-oriented passive fiber optic network. Its main functions are: uplink to the upper layer network and complete the uplink access of the PON network. Through the ODN network (consisting of optical fiber and passive splitter), it is connected to the ONU, which is the user’s equipment, to realize the control, management and ranging functions of the ONU.
Splitter is a passive device, also known as optical splitter, they do not need external energy, as long as there is input light can be. The splitter consists of incident and exit slits, reflectors and dispersion elements, whose role is to separate the required resonant absorption lines. The splitter is a component to form a PON network, a passive device that connects the OLT and ONU, and its function is to distribute downlink data and concentrate uplink data. A splitter comes with one uplink optical interface and several downlink optical interfaces. Commonly used splitter split ratio of 1:2, 1:4, 1:8, 1:16, 1:32, 1:64 several.
ONU optical network unit, ONU is divided into active optical network unit and passive optical network unit. Generally equipped with equipment including optical receivers, uplink optical transmitters, multiple bridge amplifier network monitoring is called optical nodes. pon uses a single fiber connection to the OLT, and then the OLT is connected to the ONU. the ONU provides data, IPTV (that is, interactive network television), voice (using IAD, that is, Integrated Access Device integrated access device) and other services.
Introduction of Switch
Switch means “switch” is a network device used for electrical (optical) signal forwarding, to achieve the exchange of data between devices and equipment to achieve mutual access functions. It provides an exclusive electrical signal path for any two network nodes that access the switch. The most common type of switch is the Ethernet switch. There are very many general categories of switches, different general categories have different names, according to the device level there are access switches, convergence switches and core switches; there are also switching layers are divided into two-layer switches, three-layer switches, four-layer switches, etc.
Optical cat is a digital modem, converting optical signals into digital signals, a device similar to baseband modem (digital modem), and the baseband modem is different from the access to the fiber optic dedicated line, is the optical signal. It is used for conversion of optoelectronic signal and interface protocol in WAN, access to router, and is WAN access. Optical transceiver is used for conversion of optoelectronic signal in LAN, and just signal conversion, no interface protocol conversion. Fiber optic into the home, basically placed in the home weak box, mainly white, printed with the operator LOGO, for broadband when the operator free gift.
The introduction of firewall
The so-called “firewall” refers to a way to separate the internal network and the external network, it is actually a kind of applied security technology based on modern communication network technology and information security technology, isolation technology. It is increasingly used in the interconnection environment between private network and public network, especially for accessing external network. Firewall is mainly with the role of hardware and software to produce a protective barrier between the internal and external network environment, so as to achieve the blocking of computer insecurity network factors.
A hardware device that connects two or more networks, acts as a gateway between networks, reads the address in each packet and then decides how to transmit the dedicated intelligent network device. It is usually a computer that understands different protocols, such as the Ethernet protocol used by a particular LAN and the TCP/IP protocol used by the Internet. In this way, the router can analyze the destination addresses of packets coming from various different types of networks, convert the addresses of non-TCP/IP networks into TCP/IP addresses or vice versa; and then deliver each packet to the specified location according to the best route according to the selected routing algorithm. So routers can connect non-TCP/IP networks to the Internet. It can be divided into access level, enterprise level, backbone level, etc.
Wireless AP (Access Point): that is, the wireless access point, which is used for wireless network wireless switch, but also the core of the wireless network. Wireless AP is the access point for mobile computer users to enter the wired network, mainly used for broadband home, building interior and campus interior, which can cover tens of meters to hundreds of meters. It is the function that allows the wired network signal to become a wireless signal to be emitted after the AP, so that you can connect to WIFI with your cell phone.