What are the differences and benefits of single fiber and dual fiber?

The fiber optic issue that has troubled everyone for a long time: What are the differences and advantages between single fiber and dual fiber? The editor of php Chinese website has specially compiled relevant information to give you an in-depth understanding of the differences between single and double fibers, hoping to help you solve this question. Please continue reading below, we will explain in detail the characteristics, uses of single fiber and dual fiber, as well as their respective advantages and disadvantages, to help you make a clear choice of fiber.

What are the differences and benefits between single fiber and dual fiber?

The biggest difference between single-fiber and dual-fiber optical transceivers is the difference in optical modules on their motherboards. Everything else is basically the same.

Single fiber optical terminal: The received and sent data are transmitted on one optical fiber.

Double-fiber optical terminal: The received and sent data are transmitted on two-core optical fibers respectively.

As the name suggests, a single-fiber optical terminal can save half of the optical cable resources, that is, it can send and receive data on one core of optical fiber, which is very suitable in places with tight fiber resources; while a dual-fiber optical terminal needs to occupy two cores of optical fiber, one One core is used for transmitting (Tx) and one core is used for receiving (Rx). The common wavelengths of single-fiber optical terminals are 1310nm and 1550nm, which are used in pairs, that is, one end is 1310 wavelength and the other end is 1550 wavelength, which can send or receive.

The dual-fiber optical terminals all have the same wavelength, that is, the equipment at both ends uses the same wavelength. However, since there is no unified international standard for optical transceiver products, products from different manufacturers may be incompatible when interconnected. In addition, due to the use of wavelength division multiplexing, single-fiber optical terminal products have signal attenuation problems, and their stability is slightly worse than dual-fiber products. That is, single-fiber optical terminals have higher requirements for optical modules, so single-fiber optical terminals on the market are relatively Dual-fiber optical terminals are also more expensive.

Currently, most optical terminals on the market are dual-fiber products. Such products are relatively mature and stable, but require more optical cable resources.

The transmission distance of the optical transceiver mainly depends on the optical module of the optical transceiver. Currently, the most common transmission distances on the domestic market are: 10km/20km/40km/60km/80km/100km/120km.

Generally, the optical interface of single-fiber equipment uses the SC interface, and the optical interface of dual-fiber equipment uses the FC interface. If one end is an FC interface and the other end is an SC interface, we can use a mandarin duck pigtail or an FC-SC jumper to connect them. If both ends are FC interfaces, then we can use a double-fiber FC pigtail.

Extended information:

The single-fiber bidirectional module is an optical port that uses WDM technology and filtering technology in the optical module for filtering.

Top-bidi-155M-20A: 1310nm/1550nm, realize 1310nm transmission, 1550nm reception,

Top-bidi-155M-20B: 1550nm/1310nm: realize 1550nm transmission, 1550nm reception,

Single fiber bidirectional modules are generally in pairs Use, the biggest advantage is to save fiber resources.

The dual-fiber bidirectional optical module has two optical ports, which can have wavelengths of 850nm, 1310nm, and 1550nm, and can transmit and receive at the same time.

What motherboards are there for each model of Mitsubishi Elevator?

Mitsubishi Electronics Boards

SP-VF HOPE

1. P1 board KCJ-100A 1. P1 board P203701B000

2. P1 board KCJ- 102A with parallel connection 2. W1 board P203703B000G01 has RL re-leveling

3. E1 board KCJ-120B 3. W1 board P203703B000G02 has no RL re-leveling

4. W1 board KCJ-151A 4 , E1 driver board P203702B000 early product

5. Z1 board KCJ-160A 5. E1 driver board P203712B001 later product

6. Driver board LIR-812A 6. Door machine board P231701B000

7. Drive board LIR-813A 7. Door machine board P231706B00 car top station transfer

8. Drive board LIR-814A 8. Control box P235710B000

9. Door machine board DL2-VCO 9. Control box P235705C00

10. Door operator board DL4-VCO DC door operator 10. Control box P203721B000 expansion board

11. Control box LOA-503GO8 11. Control box P235702B000 Display board

12, control box LOA-422 12, hall call board P366701B000

13, control box LOA-422 addition board 13, hall call board p366705B000

14, Hall call board LOA-410G01 first layer 14, parallel board

15, hall call board LOA-410G02 middle layer 15, module protection board

16, hall call display LHD-601 16. scale Measuring plate LIR-218 domestic

17, parallel plate KCC-100A 17, weighing plate LIR-223 imported

18, parallel plate KCB-05A with optical port 18, weighing plate LIR -219 Connection plate

19. Parallel base plate KCM-100 19. Weighing plate P122701B000G01 localization

20 Parallel base plate KCM-102 for parallel elevators

Lingyun ELENESSA

1. Main board G01 1. Electronic board LHD-730A

2. P235711B000G02 2. Electronic board DOR-261A

3. Main board P1 P203728 3. Electronic board DOR-160B

4, P203728B000G06, G05 single connection 4, electronic board KCD-911A

5, P203728B000G01 or G02 parallel connection 5, electronic board KCZ-940A

6, P203709 6. Electronic board LHD650A G23

7, P231707 Nova 7, electronic board KCR-900B

8, interface board P231706 8, electronic board KCR-650A

9, control box A complete set of boards P235711B000

The broadband box los has a red light flashing and cannot connect to the network?

LOS red light indicates a line failure.

1. Check whether the LAN cable is plugged in properly.

2. Check whether the network cable at home is broken or damaged.

3. If not, then there is a problem with the external circuit. Just call customer service and report it for repair.

The reason why the computer cannot connect to the Internet:

1. Generally, if the computer cannot access the Internet, it is a problem with the network operator. It will automatically connect after a while. You can check the status of the indicator light of the broadband modem. If the signal light keeps flashing or does not light up at all, it is not a problem with the computer. , the network signal does not reach the computer, you can call the network operator (Telecom or China Unicom) to solve the problem.

2. Sometimes the computer cannot connect to the Internet because of system settings. If it is ADSL broadband, please re-create the broadband connection and dial-up to access the Internet again. If there is a router connected, you also need to check whether the router settings are correct. Generally Router problems can be solved by restarting the router or resetting it.

3. If the computer is infected by a network virus, the computer may not be able to access the Internet. This can be solved by using anti-virus software or reinstalling the system.

4. Network card driver problems and network card damage will result in the inability to access the Internet. If it is a driver problem, you can try updating the network card driver. Generally, network cards are integrated into the motherboard. You can install the network card driver using the motherboard driver CD. If the network card is damaged, you generally can't repair it yourself. You can just buy a new network card.

What is ASUS motherboard aoso?

LBBPTD-LTE product's new generation baseband processing board mainly implements baseband signal processing functions and provides 6 SFP optical ports, which can connect to RRU through optical fiber and transmit business data, clock and synchronization signals. It supports up to 9.8304Gbit /s rate, compatible with 6.144Gbit/s and 2.5Gbit/.

In PCB, two-piece and three-piece boards generally refer to the same boards being assembled into 2 or 3 pieces to form a larger single-piece board to facilitate production.

If a board consists of four different types of small boards put together, four boards of each type.

What does business board mean? What does business board mean?

Business slots mainly refer to the pre-installed interfaces for you. These slots may be voice ports, Ethernet ports, or optical ports. When your company's business develops, you may need to deploy VOIP, so you can just install a voice port in this business slot. The number of slots is the number of interfaces you can expand. By board, you are referring to the switch board. That's just like the motherboard of your host, but the switch is used as a network device.

When I start my computer, it shows FATAL ERROR SYSTEM HALTED. Is it OK to restart? Sometimes the system is not entered directly. What is the reason?

Reasons:

1. The optical cat itself is faulty and the optical receiver is partially damaged, which can also cause this phenomenon.

2. Some optical fibers are bent too much. Excessive bending of the optical fiber will affect the total reflection transmission of the optical signal in the optical fiber, causing the signal to be blocked.

3. Server failure, such as server maintenance, will cause a red light. You can call the network operator to report for repair.

4. Optical cable failure (including a broken optical splitter) will also cause the optical cat to not receive light or the light reception is too low. At this time, the optical signal light will also flash or a red light will warn.

5. The optical port of the computer room emits low light or does not emit light, causing the user-end optical modem to work abnormally. At this time, the optical signal light cannot receive the optical signal sent from the optical cable or the power of the received optical signal is too low, which may cause The handshake between the optical modem and the computer room is abnormal. At this time, the optical signal light will flash or a red light will alarm.

Solution:

You can unplug the power cord of the router and restart the router to return to normal

1. Find the back of the router and unplug the power cord of the router. Lose.

2. Wait two minutes after unplugging the power cord, and then plug it in again.

3. After the indicator light returns to normal, you can access the Internet normally.

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