The DEM – 311GT transceiver is a high-tech device that provides high-speed information transfer and reliably protects the transmitted data. At the same time, he has quite a democratic cost and a fairly simple setup procedure. It is to this network device that the review will be devoted.
Appointment
The most optimal optical transceiver standard SFP DEM – 311GT to use when implementing high-speed switching to the global web. It has a high information transfer rate, which, according to technical specifications, can be 1.25 Gbit / s. At the same time, an expensive optical cable is used as a medium for data exchange. Therefore, the use of such a network device is most justified only in large computer networks. The latter include, for example, the computing systems of large companies or the distributed equipment of providers. Actually, these are two possible options for using the hero of this review. In all other cases, the use of such a specialized transceiver is either technically or economically unreasonable.
Delivery list
Options DEM – 311GT does not cause any complaints. The manufacturer included everything necessary for the new owner of such a device to start using it. The delivery list of this transceiver consists of the following elements:
- Network device.
- Digital media with a set of drivers and electronic documentation for this transceiver.
- Warranty card.
- Quick start guide for the network system.
The configuration of the network device in question does not cause any significant complaints. It has all the most important components that will allow the new owner to use such a transceiver for its intended purpose.
Parameters
The D – Link DEM – 311GT transceiver is manufactured in the SFP form factor. That is, it is a compact device that can be used as part of any modern computing system. Also considered in the framework of this review, the solution is equipped with one single optical port format 1000Base-SX, the peak transfer rate of which may be 1.25 Gbit / s. It is also necessary to note the moment that even though nominally it can transmit information in duplex mode, but due to hardware limitations, only unidirectional data sending is possible.
Only an optical cable can be connected to this transceiver. Moreover, its longest segment of a computer network can reach 550 meters. If you use a repeater, then the distance can be significantly increased. When transmitting information, the DEM – 311GT uses an optical radiation wavelength of 850 nanometers.
The output power of the optical signal can be from -3 to -10 decibels. This value is sufficient for high-quality transmission of information to a previously specified distance. In this case, the recommended input power should be from -3 to -20 decibels. The values given earlier must be taken into account when implementing a computer optical network.
Reviews
Most of the users positively respond to DEM – 311GT DD – J1A. This optical transceiver is aimed at using very, very large companies as part of computer networks. Therefore, the highest requirements are initially put forward for its functioning.
It has a high level of reliability and a simple setup procedure. Also, the cost of this device is not so high. Today it is 1700 - 1900 rubles. At the same time, it is recommended to purchase it in specialized online stores. As a rule, they have the lowest cost with the same level of quality. These are the main advantages of this transceiver. Essentially, the device in question has no significant drawbacks. At least, the owners of such transceivers and the corresponding technical specialists who are engaged in their maintenance do not focus on them.
Conclusion
In this short article, an optical transceiver of the DEM – 311GT model was considered. It is a specialized solution for high-speed data transmission systems. It is for such use that the hero of the review is intended. In all other cases, an electric rather than an optical method of transmitting information is already used. Therefore, technically such a device is no longer possible to use.