Q: 1, FTTB, FTTC, FTTH, FTTO, FSA respectively, refers to what?
A. Fiber to The Building FTTB: FTTC: Fiber to The Curb FTTH: Fiber to The FTTO: Home Fiber The to Office FSA: Fiber to the Serving Area
Q: 2, CAT5, CAT5E, CAT6 respectively, refers to what?
A: it means the rate level of the integrated wiring system, the CAT5 is the five class, the CAT5E is over five, CAT6 is the six category. Generally, only the comprehensive wiring of each link to achieve a class of time to be called the class of network. Such as our cable and network module adopts CAT6 products and terminal jumper is used CAT5e products, so the network can only reach CAT5e rate, so can only be CAT5e, namely five kind of network
Q: 3, DDF, IDF, MDF, ODF, respectively, to refer to what?
A::Digital Distribution Frame DDF:Main Distribution MDF Frame IDF:intermediate Frame Distribution:Optical Distribution Fiber ODF Frame
Q: 4, WAN, LAN, respectively, refers to what?
Answer::Local Area Network LAN local area network, referred to as lan. LAN on the router on the general representative of the network. :Wide Area Network WAN wide area network, referred to as wan. The router WAN on behalf of the general network, namely local broadband connection.
Q: 5, Bite, Byte, BPS, Bps, respectively, to refer to what?
A: Bite: bits, a binary number (0 or 1) indicates a bit. Byte: byte, eight binary digits of a string of digits to become a byte (i.e., eight bits to form a byte):Bite per Second BPS bits per second. General network transmission speed by Mbps, that is, the:Byte per Second Bps per second, the number of bytes per second.
Q: 6, VLAN is what?
Answer: LAN Virtual: virtual local area network. With the LAN based on the physical connection, the network switch which supports VLAN can then be divided into multiple LAN and LAN.
Q: 7, TCP/IP is what?
A: TCP/IP (Control Protocol/Internet Protocol Transmission), the transmission control protocol / network protocol, is an industry standard protocol set, which is designed for wide area network (WANs). It was developed by the Research Institute of ARPANET network. Transmission protocol is like the language of communication, we can communicate with each other, otherwise we don't know what the other person is saying. Now the Internet is all used TCP/IP protocol.
Q: 8, LIU is what?
A: LIU: Interconnection Unit Lightguide fiber optic interconnecting device, which is used to connect optical fiber and optical cable.
Q: 9, what is the residential information distribution box?
Answer: Housing information distribution box (hereinafter referred to as the information box), is the inevitable product of the development of the times and the progress of science and technology. Because before residents of the housing of the telephone, television respectively by telecom / Netcom, broadcasting system, each providing self routing network, leading to the housing inside the TV lines, telephone lines, later with broadband line are fragmented, unable to manage and maintain, often out of the question will go to the open wire or simply can not solve. The most basic function of the information box is to focus on all the telephone, TV, computer (Network) in the house, which is convenient for maintenance in the future. Powerful information box will provide security, audio and video sharing, weak connection and other functions. Its size is similar to the general residential power distribution box or slightly larger.
Q: 10, the residential information wiring box is the standard? Why do some parts of the function of the box is not called residential information wiring box?
Answer: the countries have yet to make any residential information distribution box, the national standards or industry standards, nationwide Shanghai only a local standards (DB31/T371.2-2006 residential information distribution box general technology and conditions, so compared with other names "residential information distribution box" also is the name of a semi official. But because the name was too long, so all the domestic manufacturers less with this name, according to the different manufacturers have many names, such as: information box, weak box, intelligent box, wiring box, hub boxes, and so on. In fact, are similar in function.
Q: 11, my house has been renovated, but also to install the information box?
Answer: it should be not, mainly because of the problem of the box itself, mainly due to the installation of the information box to the entire residential re wiring, the cable will be aggregated to a place. Unless the wiring has been made in such a way that it seems very small, or it is not possible to install a message box.
Q: 12, why do you have a lock on the box, the key must be attached to the outside or inside the box?
Answer: because the key is a sharp accessories, if the key is placed in front of the process is very easy to cause damage to the surface of the panel, the impact of beautiful, for the dark box, the side will not affect the appearance of the scratch, the box will be placed in general.
Q: 13, the radio and Television Bureau of cable television in the home signal should be how many dB? If you want a clear picture, how many dB signal to reach?
A: the intensity of TV signal in our country's standard is 70dB, the general design value is 60-80dB, the European standard is 68dB. General signal in 60dB above the TV will be able to
Q: 14, switching power supply and ordinary power transformer power (also known as linear power) what is the difference? Advantage in where?
A: linear power supply adjustment tube work in the enlarged state, so the heat is large, the efficiency is low (35%), the need to increase the size of the heat sink, but also need to be the same volume of power frequency transformer, when the system to make multi group voltage output transformer will be more huge. The adjustment of the power switch tube in a saturable and as state, and low calorific value, high efficiency (75%) and dispense with the large volume of transformer. But the switch power output DC superposition large ripple (50mV at 5V output high), at the output end and zener diode can be improved, also due to the switch will produce a lot of peak pulse interference, also need to in circuit serial magnetic beads to be improving. Relative to the linear power supply is no more than the defect, the ripple can be done very small (5mV). For the power efficiency and the installation volume of the local use of the power supply is good, for the electromagnetic interference and power supply of pure have the requirements of the place (such as capacitance leakage detection) to choose a linear power supply. In addition, when the circuit needs to be isolated now most DC-DC to do on the part of the isolation power supply (DC-DC in its work principle is switching mode power supply). Also, the high frequency transformer used in switching power supply may be around the system to make more trouble. For our own products, because the power supply module or placed in the box, or placed in 86 cartridge inside, so power supply can not be issued too much heat in order to ensure the safety and long-term stability. And switch power supply ripple on the impact of our products is relatively small, way we switch power supply output end has a voltage stabilizing tube, magnetic beads to improve output, also we all active module input were the second regulator to ensure active module power supply.
Q: 15, the same is 7.5V DC why GB-SPWR can only supply a group of use, and the GB-PKxx series for the two or more?
Answer: the power supply of the active module in addition to the voltage to be accurate, but also to match the power. General GB-SPWR due to the size limit, the output power can only be a set of active module power supply, and the GB-PKxx system in space than the GB-SPWR to be rich, whether it is the width or depth than the GB-SPWR, so we can design the time to provide greater output power, to provide a set of or multi group output
Q: the input line 16, our power module seemed very fine, with 220V, it will not burn ah, why?
Answer: in fact, there is no need to worry about this, the line security problems generally have two categories, one is not easy to cause electric shock, two is not enough traffic, resulting in a high temperature of wire rod and become a fire hazard. For 220V, the pressure is very easy to do, generally we use the wire rod is more than 1000V, so there is no problem for the load flow, because the copper wire itself has a certain resistance, so the current will produce a certain amount of heat (current x resistance), according to the formula, the greater the current heat. How much is our current? To the maximum of GB-PK06, the total power is not more than 35W, the power flow =30W/220V<140mA, generally we will divide the efficiency as well as the consideration of design capacity, it is assumed that the input of the power of the load flow can not be less than 300mA. We use the input line is 16x0.12mm, access to the relevant standards, the load flow >1.8A, far greater than we are required. But considering the physical strength, can not be used to wire, so we use this kind of wire current
Q: 17, why we GB86 series installed in the cassette switch power supply output line and GB-SPWR that made 90 degree elbow?
Answer: because the power supply of GB86 series power supply line is often through the wiring duct (PVC), if it is elbow, the operation difficulty is greatly increased, and it is not possible to 90 degrees DC output line through the pipeline.
Q: 18, the active power supply is the basis for judging whether the exchange is what? For example, why the router is a DC, the exchange is the exchange of the program?
Answer: the general active module power supply is DC power supply. For example, the active power of the China Everbright communications series modules are powered by DC DC7.5V, so that the power supply of different active modules can be used to swap. But in some special active module power supply will be different, such as program-controlled switches, because the phone ringing need fixed frequency AC power supply, so SPC exchange power part is communication. At present, there are only a series of modules of the China Everbright communication module of the programmable switch used in AC power supply (in fact, the power supply of a number of different groups of different voltage, which also contains the DC power, but in order to facilitate the presentation, we generally referred to as the AC power supply for AC power
Q: what is the difference between the 19, the hub (HUB), the network switch (Switch), and the router (Router)?
A: hub, network switches, routers can achieve a network share of the Internet, but they are different. Hub, referred to as HUB, if the HUB to achieve shared access, must be in the network to set up a direct connection to the broadband host, if the host does not boot, then other computers can not access. General HUB transmission rate is only 10Mbps, and a network with more than two computers at the same time, it will produce conflict, resulting in transmissio
Q: 23, what is the optical transceiver? What kind?
A: fiber optic transceiver is a kind of Ethernet transmission media conversion unit which will be exchanged with the short distance optical signal and the long distance optical signal. In many places, it is also known as Converter Fiber. Fiber optic transceivers are generally used in the Ethernet cable is unable to cover, must use the optical fiber to extend the transmission distance of the actual network environment, while helping to connect the optical fiber to the last mile of the metro line and the more outer network also played a huge role. With an optical transceiver, it is also necessary to upgrade the system from copper to fiber, but the lack of funds, human or time of the user to provide a low-cost solution. In order to ensure the complete compatibility with other network devices such as network cards, relays, hubs and switches, fiber optic transceivers must comply with 10Base-T, 100Base-TX, 100Base-FX, IEEE802.3, IEEE802.3u, and so on. In addition, in the EMC anti electromagnetic radiation should be consistent with Part15 FCC. At present, due to the major domestic operators are vigorously building residential networks, campus networks and enterprise networks, so the amount of fiber optic transceiver products are constantly improving, to better meet the needs of the construction of access networks. Fiber optic transceivers typically have the following basic features: 1 to provide ultra low delay data transmission. 2 completely transparent to the network protocol. 3 using the ASIC chip to achieve the data forwarding speed. Programmable ASIC will be a number of functions on a chip, with a simple design, high reliability, low power consumption, etc., can make the device to get higher performance and lower cost. 4 frame type equipment can provide the hot swap function, easy to maintain and continuously upgrade. 5 the network management equipment can provide network diagnosis, upgrade, status report, abnormal situation report and control functions, can provide complete operation log and alarm log. 6 devices use 1+1 power supply design, support ultra wide supply voltage, power protection and automatic switching. 7 support ultra wide operating temperature range. 8. To support complete transmission distance (0 ~ 120 km) optical fiber transceiver according to the interface of different can be divided into SC optical fiber transceiver, ST fiber optic transceivers, FC optical fiber transceiver; according to different optical signal transmission can be divided into multimode optical fiber transceiver, single-mode optical fiber transceiver device; according to the LAN side at different rates can be divided into Mbps optical fiber transceiver, the optical fiber transceiver.
Q: 24, why the new crystal head can not plug into the network socket? Where is the difference between RJ11 and RJ45?
A: didn't play in the line of crystal head, his reed has not through the special tool pressure to cable, so the height of the new head of the crystal reed will higher than has taken the pressure off the crystal head, so want to put new crystal head is inserted into a socket on the, will come out of the first crystal reed block live to insert. RJ11 and RJ45 the simple difference is, RJ45 RJ11 than larger, RJ45 usually eight reed, RJ11 generally only two or four reed.
Q: 25, the home of the integrated wiring and industrial cabling have what same point and different points?
Answer: the same point: the same as the integrated wiring, will be within a certain range of various electric cable according to a certain rule to carry out reasonable wiring, in order to achieve each node in the region, various signals of different points: 1. Even if it is a relatively large area of the villa integrated wiring is only a few hundred square meters, and the industrial area is far more than the area of the industrial layout, so as to consider the details of more; 2 wire type selection is different. In order to shorten the construction period, simplify the maintenance and enhance the flexibility of the system, the industry is generally to take a more single wire, the most typical is the UTP and the light, and home
Q: 26, what is the integrated wiring system? What are over five categories? In addition to the five categories, there are other categories?
A: the simple, integrated wiring system is the low working voltage (non power supply line) for the transmission of voice, data, video and other information technology standardization, structured industrial wiring system.
Q: 27, a complete standard of the integrated wiring system, which is composed of? What equipment or materials will be used in general?
A: it generally consists of six parts, such as the building group subsystem, the subsystem, the vertical subsystem, the horizontal subsystem, the Guan Lizi system, the work area subsystem, and so on. Usually used in the cable, jumper, optical fiber jumper, pigtail, MDF / optical distribution frame, all kinds of cabinet / wiring boxes, network module, optical fiber adapter, fiber fused disk access and, also some auxiliary products, such as pipe, bridge, and so on.
Key words：FTTB、FTTC、FTTH、FTTO、FSA What referring to?