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Wireless

wireless connections

Wireless data transmission has been, and will remain in the future, an essential part of any data network, but it has changed a lot since the days of Marconi. The specific characteristics of the volatile transmission environment can be eliminated by modern wireless technologies, and as a result they are slowly reaching the capacities and qualities of line connections. This shifts their application from end-to-end access networks even deeper towards backbone applications. At the same time, the view of microwave connections is slowly but surely changing from a mere transport medium to a full-fledged network element. State-of-the-art wireless technologies already have features that support the concept of SDN networks.

I want to know more about unlicensed connections, licensed connections, multiband.

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Wireless in more detail

We can imagine many things under the term wireless connection. From Bluetooth connection between the phone and hands-free set in the car, through home Wi-Fi internet connection, mobile telephone calls and satellite transmissions. However, we deal with data transmission at higher speeds and over longer distances, such as those used by telecommunications service providers in their WAN networks or by corporate users in larger LAN networks. These are typically point-to-point connections, i.e., two radios with two mostly parabolic antennas facing each other and connected by a very narrow radio beam, requiring direct visibility. Their design, frequency bands used, and user interfaces can be very diverse.

Capacities typically required by operators have been increasing dramatically in recent years, moving from hundreds of Megabits per second to units of Gigabits. Currently, 10Gbps connections are already commonly available and we will soon see two to four times this speed. By contrast, the required spanning distances are decreasing; whereas 10 years ago connections spanning tens of kilometres were built, today the typical distance is measured in units of kilometres.

A high-quality connection requires 
a high-quality design

Wireless connectivity is not just about the choice of technology. Even if you choose the most expensive technology of the highest quality, you may not be satisfied with the result. A high-quality connection starts with a high-quality design. The design of the connection must be based not only on the user’s needs, i.e. what capacity needs to be transmitted over what distance, but also on a number of other factors, such as possible further development, required interfaces, technical capabilities of individual types of equipment, availability of frequency bands in a given location, how large antennas the user can afford, legislative requirements for the use of frequencies, ... and last but not least, the price of the technology and possible charges for its operation.

DETAILED DESCRIPTION

Wireless connections

In terms of the aforementioned operating charges, we divide the connections into licensed and unlicensed.

Licensed connections

individual authorisation

Licensed connections are those that can only be operated on specific reserved frequencies under specific conditions and for the use of which a predetermined fees are paid to the state. Before the construction of such a connection, it is necessary to apply to the Czech Telecommunications Office (CTO) for an Individual Authorisation (IA); the Office will assess the application, coordinate the required parameters of the connection with the database of existing connections, including foreign connections, and then issue the IA (or reject the application). Only then can the connection be put into operation. The reward for paying the fees is the user’s right to operate the connection without interference, whether by other connection operators or by other technical means.

Unlicensed connections

license-free

Unlicensed connections (or license-free connections) are basically very similar, only they are operated on reserved frequency sections, where technical and operational conditions are set by the so-called General Authorisation (GA). If these conditions are met, anyone can make a connection anywhere without having to apply for anything in advance. In some specific bands, registration is recently required, i.e., notification of the technical parameters of the connection to the regulator (CTO). The disadvantage of non-payment of charges is that mutual and other interferences must be resolved primarily by agreement between the operators. This is what the registration of connections is supposed to help with, so that everyone can first compare their plans with the database of existing connections to avoid any potential conflicts.

When choosing a frequency band, we must choose between the so-called microwave bands, which are frequencies between 6 and 42 GHz, and millimetre bands, which today include 60, 70, 80 GHz bands and, in the future, 92-114 and 130-174 GHz bands will be added. In the microwave band, there are sections available for licensed connections (e.g., 7, 8, 11, 13, 15, 18, 23, 26, 38, 42 GHz) which are, with only minor differences, generally regulated in a similar way. In the licensed part of the spectrum, the transmission power is not limited. And then there are also sections for unlicensed connections (e.g., 10, 17, 24 GHz), which are regulated in different ways, but all of them limit the transmission power of the connections in some way. In contrast, all the permitted millimetre wave bands are licence-free, and although they involve power limits, they are so high that technically they cannot be exceeded (at least for now).

THE SOLUTION AND ITS OBJECTIVES

Solution for unlicensed bands

Our solution for unlicensed bands focuses almost exclusively on the millimetre wave band, i.e. 60GHz bands and higher. Here we can offer a wide range of products from the portfolio of two manufacturers, Ceragon Networks and Siklu Communications.

For backbone applications, i.e., connections with high capacity and long range, we offer the following products:

 

 

ManufacturerModel
Band
[GHz]		Capacity [Gbps]
Ø Antennas [cm]
Ports
Power suply
PSE
SikluEH-250070/801/216/30/602× GbE el 
+ 2× SFP		48V / 45W DC/PoE48V / 13W
SikluEH-8010
70/802/5/1016/30/40/601×10GE combo 802.3bz/SFP
+ combo 1× 1000BaseT
48V / 50W
DC/PoE
-
CeragonIP-50E70/802.5/5/1030/40/601× 1/2.5 GE
1× 1/10 GE
1× QSFP (40GE/
4× 10GbE)
48V/60W DC/PoE
-

For transport applications, i.e., connections with medium capacity and medium range, we offer the following basic products (other variants are also available):

ManufacturerModel
Band
[GHz]		Capacity [Gbps]
Ø Antennas [cm]
Ports
Power suply
PSE
SikluEH-1200FX70/80116/30/40/602× GbE el.48V / 26W PoE48V
26/40 W
CeragonIP-20E70/801/2.530/40/601× GbE el.
1× GbE SFP
1× SFP/CSFP (GbE/2×1GE BiDi)
48V/43W DC/PoE
-

For access networks, characterized by short range and often asymmetric traffic, TDD connections, i.e., time-division connections allowing for traffic to be set up asymmetrically, are ideal. Again, we list only the most popular types:

ManufacturerModel
Band
[GHz]		Capacity [Gbps]
Ø Antennas [cm]
Ports
Power Suply
PSE
SikluEH-710FX
701 (UL+DL)16/30/603× GbE el.48V / 26W PoE48V
26/40 W
SikluMH-T280 LR
603.8 (UL+DL)16/30/601× GbE el.
1× 1/2.5 GE el. 1× 10GE SFP+
48V / 25W PoE
48V
26/40 W

 

Are you interested in unlicensed connections?

If you are interested in the above offered connections of any of our manufacturers or would like to ask us something, please click on the button below and write us a short message with your specific request. We’ll get back to you to tailor a solution to your needs.

I AM INTERESTED IN THE PRODUCT
THE SOLUTION AND ITS OBJECTIVES

Solution for licensed bands

Our solution for licensed bands covers all bands between 6 and 42 GHz and all types of connections in terms of design: full-outdoor, split-mount and even full-indoor. We offer exclusively connections from the Israeli manufacturer Ceragon Networks. Products most frequently supplied to the Czech market include the following:

ManufacturerModel
Band
[GHz]		Max. channel [MHz]
Max. Capacity
Ports
Power Suply
CeragonIP-20S6-4280650 Mbps3× GbE (el./opt.)48V / 35-40W
DC / PoE
CeragonIP-20C
6-422× 80 (XPIC)1.2 Gbps3× GbE (el./opt.)
48V / 48-75W
DC / PoE
CeragonIP-20F
6-42Split version
up to 3× RFU
by RFU6× 1/2.5 GbE (el./opt.)
16× E1, STM-1
48V / 48-71W
2× DC
CeragonIP-50C
6-422× 112(224) XPIC4 Gbps4× 1/2.5/10 GE (el./opt.)
48V / 90W
DC / PoE

 

Are you interested in licensed connections?

If you are interested in the above offered connections of any of our manufacturers or would like to ask us something, please click on the button below and write us a short message with your specific request. We’ll get back to you to tailor a solution to your needs.

I AM INTERESTED IN THE PRODUCT
ALTERNATIVE SOLUTION

Multiband

In today’s era characterized by a dramatic increase in the volume of transmitted data, coupled with user pressure to keep the costs down, manufacturers are looking for non-standard solutions. One of these is a combined solution that takes advantage of the benefits of connections for unlicensed bands, i.e., high transmission capacity, and for licensed bands, i.e., higher availability. Generally, this solution is called dualband, multiband or carrier aggregation. Each of the manufacturers, Ceragon Networks and Siklu Communications, dealt with this issue in slightly different ways.

The Ceragon solution is described in more detail here, the Siklu solution here.

 

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