Photoelectric Switching

- Jul 18, 2020-

The photoelectric exchange in communication technology generally refers to the use of> photoelectric converters (also called optical fiber transceivers) to convert electrical signals transmitted on twisted pairs into optical signals transmitted on optical fibers, or optical signals transmitted on optical fibers Converted into electrical signals that can be transmitted on twisted pair cables, extending the connection distance of Ethernet. Mainly used in long-distance transmission of Ethernet.

definition
Use photoelectric conversion to realize the exchange of different light wavelengths.

Principles of Photoelectric Exchange
Nowadays, when transmitting signals over long distances, optical fiber transmission is used, which has wide transmission bandwidth and good stability. It is necessary to convert the electrical signals generated by computers, telephones, or faxes (we know that these electronic devices generate electronic signals) into optical signals before they can be transmitted in optical fibers. This is photoelectric switching. Through the photoelectric converter, both electrical signals can be converted into optical signals, and optical signals can also be converted into electrical signals.

Work status description
Photoelectric converter

The indicators are as follows:

UFDK, on means the Ethernet port is full duplex, off means half duplex

ULINK, bright means the Ethernet is connected normally

OFDK, bright means the optical port is full-duplex, off means half-duplex

OLINK, bright means the optical port is connected normally

USPD, bright means Ethernet port 100M

PWR, bright means the photoelectric converter is powered on normally

RSPD, bright means remote 100M connection, off means remote 10M

RLINK, on means the remote Ethernet is normal, off means the remote Ethernet is abnormal

Especially, when the photoelectric converter is not on the network tube, RSPD and RLINK are not bright.

Status combination:

1. Normal situation: switch A E48 is up, 6 lights of both photoelectric converters are on, switch B E46 is up;

2. Optical cable break/fiber break: switch A E48 up, OFDK on the photoelectric converter, OLINK light is off, switch B E46 up;

3. The network cable of the switch A side is broken: switch A E48 is down, the photoelectric converter UFDK, and the ULINK light does not light;

4. AC power failure on side A of the switch, AC power supply of photoelectric converter: E48 down, all lights of photoelectric converter are off.

Photoelectric switch
Since the discovery of the photoelectric effect, photoelectric conversion devices have been developed by leaps and bounds. At present, various photoelectric conversion devices have been widely used in various industries. Commonly used photoelectric effect conversion devices include photoresistors, photomultipliers, photocells, PIN tubes, CCDs, etc. The wide application of photoelectric converters is mainly because they have the following characteristics:

1. Flexible optical port configuration, support SC/ST/LC, single mode/multimode

2. Low-voltage redundant DC dual power supply or AC power supply

3. IP30 protection level

4. The working temperature can support -40℃~75℃

The photoelectric converter is an Ethernet transmission media conversion unit that exchanges short-distance twisted-pair electrical signals and long-distance optical signals. It mainly uses the photoelectric effect to convert optical signals into electrical signals. When transmitting signals over long distances, optical fiber transmission is used. The optical fiber has a wide transmission bandwidth and good stability. It is necessary to convert electrical signals generated by computers, telephones or faxes into optical signals before they can be transmitted in optical fibers. It is necessary to use a photoelectric converter, which can convert electrical signals into optical signals, as well as optical signals into electrical signals.

The photoelectric converter, commonly known as the optical cat, is a converter that can convert optical signals into electrical signals as well as electrical signals.

The photoelectric converter, also called optical fiber transceiver, can extend the connection distance of Ethernet by converting the electrical signal transmitted on the twisted pair into the optical signal transmitted on the optical fiber. The transmission rate is 10/100Mbps adaptive, and an RJ45 is provided. Port UTP, an optical interface (ST/SC) Fiber, and a -48V/220V power supply switch. Mainly used in the gigabit link of Ethernet equipment, extend the transmission distance of the network through its own photoelectric conversion, and expand the bandwidth of the network to 1000M.

Folding photoelectric converter performance characteristics
1. Flexible optical port configuration, support SC/ST/LC, single mode/multimode

2. Low-voltage redundant DC dual power supply or AC power supply

3. IP30 and above protection level

4. The working temperature can support -40℃~75℃

technical challenge
When traditional communication networks and optical fiber networks coexist, there is a process of photoelectric conversion, and the combination of the two is limited by electronic devices. The capacity of photoelectric exchange information is determined by the working speed of the electronic part. The optical fiber network with larger bandwidth is used for photoelectric exchange. It becomes narrow, and the bandwidth of the entire network is also limited. Therefore, in the optical communication network, it is necessary to directly perform optical switching on the switching node without the process of photoelectric conversion, so as to release the communication bandwidth of the optical fiber and realize its advantages of large communication capacity and high communication speed.

Future trends
Optical switching will be replaced by optical switching.

The advantage of optical fiber communication lies in its huge information capacity and strong anti-interference ability. Its superior performance has long been confirmed, and it has gradually replaced the communication network mainly composed of electronic circuits in modern communication systems, and has become an important component of modern communication. . However, the lack of electronic circuits in the original communication system hinders the use of the advantages of optical fiber communication systems and becomes a performance bottleneck. In the optical fiber communication system, only a scientific and reasonable communication system structure can take advantage of the optical fiber system to form an ideal high-speed, large-capacity, and high-quality optical fiber network. The original electronic circuit communication is an all-optical network implementation. A huge obstacle, to remove the influence of electronic circuits requires the advancement of optical fiber communication system technology.

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