České Radiokomunikace

Transmission services for remote connections

Reliable telecommunications and data connectivity to remote locations via our backbone network

Our powerful backbone network will transparently connect any of your remote locations, extend your telecommunications networks, transmit data securely and over long distances, including multimedia, or serve as the ideal backbone for your own VPN or wide area network (WAN).

A robust, high-capacity, and universal transmission network

State-of-the-art technology
State-of-the-art technology
L2/L3 technology can do Ethernet transmission as well as create MPLS VPNs.
For companies and operators
For companies and operators
It serves companies with multiple offices, internet service providers, and television stations, cutting down on their telecommunication as well as data transmission costs.
Multimedia distribution
Multimedia distribution
It can distribute digital television content (DVB-T) and high definition (HD) programmes without any problems.

What our clients say

WOOD & Company Financial Services
WOOD & Company Financial Services

Vladimír Vojtíšek
CIO, WOOD & Company Financial Services

We have been running the IT infrastructure for our services on CRA’s public cloud for over four years,’ says Vladimír Vojtíšek, CIO of WOOD & Company. ‘CRA prepared a technically advanced solution tailored to our needs, which relieved us from the worries of infrastructure maintenance and administration, as well as scaling. As our company grew and expanded to other regions, the shared public cloud environment started to push its limits, especially in terms of the ability to optimally combine the operation of a large number of diverse applications.

WIFCOM a.s.

Michal Fryš
Head of the INTERNET Centre, WIFCOM a.s.

We have chosen CRA as a reliable partner to help us through consolidated and professional infrastructure services, which helped us achieve our business objective: to deliver internet services to our customers without outages. What I particularly appreciate about working with CRA is their personal, professional, and innovative approach. And last but not least, their reliability and flexibility in dealing with our service requests.
Sledovanitv.cz s.r.o.

Miroslav Slugeň
Deployment manager, Sledovanitv.cz s.r.o.

Key for the functionality of our services is server hosting and connectivity – services that CRA have provided to us reliably on a partnership basis. Compared to our previous suppliers, we get superior service and high-quality services that are hosted, relieving us of the cost of having our own human resources. We greatly appreciate CRA’s speed and professionalism in handling both business and service requests. We are pleasantly surprised by the growth in the number of entities in the data centres, which adds to their prestige, and we are happy to be part of the CRA customer portfolio.

Transmission service options

Ethernet Line
Transmission service options
  • Lease of Ethernet circuits in an L2/L3 network
  • Efficient high-speed interconnection of remote local area networks (LANs)
  • Classic 100 Mbps, 1 Gbps and 10 Gbps Ethernet interfaces
Dark Fibre
Transmission service options
  • Lease of ‘dark’ optical fibres
WDM Line
Transmission service options
  • Lease of transmission capacity of CWDM/DWDM optical technologies
Connecting line lease
Transmission service options
  • Lease of radio links

Facilities to support your private data networks

  • 24/7 support
    A 24/7 helpdesk will be available to you.
  • Maximum data protection
    The transmitted data is not interpreted in the networks and is protected against misuse.
  • Constant transmission rates
    The transmission speed is independent of the network load.
  • Even gigabit speeds
    High transmission speeds of up to thousands of Mbps.

We hold the requisite certificates and security is our top priority

  • NBÚ certificate
    We hold a valid certificate of the National Security Authority for coming into contact with confidential information.
  • Physical and cyber security
    Our requirements for ensuring physical as well as cyber security of the services we provide are uncompromising.
  • Proven technologies
    We use and offer only proven technologies to provide our services and ensure cyber security.
  • ANSI-TIA942
    The technology is operated from an ANSI-TIA942 certified DC TOWER data centre
  • Common Criteria Certification for Information Technology (IT) Security (ISO/IEC 15408)
    Certification at CC EAL 4+ level
  • ISO 9001
    Quality management systems
  • ISO 14001
    Environmental management systems
  • ISO 19011
    Standard for the certification of internal auditors
  • ISO/IEC 20 000-1
    Information technologies – Service management system requirements
  • ISO/IEC 27001
    Information security management systems
  • ISO/IEC 27017
    Information technologies – Security techniques – A set of guidelines for cloud environment security and for minimising the potential risk of security incidents
  • ISO/IEC 27018
    Information technologies – Security techniques – A set of procedures for the protection of Personally Identifiable Information (PII) in public clouds acting as PII processors
  • SOC Type 1 and Type 2
    SOC 2 Type 1 and Type 2 certifications, issued in accordance with American Institute of Certified Public Accountants (AICPA) standards and requirements, cover information management and security in organizations
  • ISO 50 001 
    Energy management systems
  • PCI-DSS 
    Compliance with the requirements of PCI-DSS for data centre operators
  • NBÚ
    Certificate for access to classified information up to the classification level ‘CONFIDENTIAL’
  • GDPR compliance
    The infrastructure is fully compliant with GDPR requirements
  • High level of availability
    99.95% availability guaranteed by an SLA.
  • Connectivity throughout the country
    Our extensive backbone network guarantees wide availability.
  • Circuit backup
    Circuits can be automatically backed up in our backbone network.

More detailed information

Our transmission services include several different technologies. Although they are all designed for high-speed, reliable, and transparent telecommunications and data transmission, they differ in terms of the principle and areas of their application. It is therefore always advisable to first consult our specialists who can assess your needs and help you choose the most appropriate solution.

The Ethernet Line service transmits data between remote Ethernet networks using technologies operating on the 2nd (L2) or 3rd (L3) layer of the ISO OSI model. The link terminates with a standard RJ-45 or RJ-45 SFP connector, depending on the transmission speed. Ethernet-type services are provided via L2, while L3 enables the provision of MPLS (Multiprotocol Label Switching) services, which are the natural support for the IP protocol used by most applications (data, voice, video), and allows the creation of separate virtual private networks (VPNs).

Synchronous Digital Hierarchy (SDH) is a technology for digital signal transmission in telecommunication networks. It is used for the transmission of voice, data, and other communication services over optical fibre, microwave links, or cables. The main objective of SDH is to enable efficient and reliable transmission of large amounts of data over long distances and over different transmission media. The SDH technology is designed to be flexible and adaptable to different transmission speeds and interfaces. It can support various types of services, including voice, data, and video.

The service refers to the lease of a separate, i.e., dark, optical fibre that connects two sites. The capacity of the link is not defined in any way as the service only provides the transmission medium, without terminal equipment.

WDM (Wavelength Division Multiplexing) is a transmission technology that allows multiple optical signals of different wavelengths, i.e., colours, to be transmitted simultaneously over a single optical fibre. Each signal is transmitted on a different wavelength (frequency, colour), allowing efficient use of the capacity of the optical fibre.
The principal idea of WDM technology is to divide the bandwidth of an optical fibre into several separate optical channels, with each channel corresponding to a single wavelength. These channels are independent and each can transmit different types of signals, such as voice calls, data transmissions, and video.
In practice, two versions of the WDM technology are used:

  • CWDM (Coarse Wavelength Division Multiplexing). CWDM uses larger spacing between wavelengths and creates fewer channels than DWDM. It is typically used over shorter distances in the range of tens of kilometres.
  • DWDM (Dense Wavelength Division Multiplexing). DWDM is a more advanced form of WDM that uses narrower spacing between wavelengths and therefore also more channels. It makes it possible to transmit a large number of signals on a single fibre and to reach distances of hundreds to thousands of kilometres.

Our transmission services offer both types of technology. The WDM Line service is set up over a physical connection that is typically defined by the addresses between which the service needs to be established, the type of forwarding interface between the provider’s and the customer’s networks, and the transmission capacity of the service. GeE interfaces are available for 1 and 10 Gb/s and STM-64 interfaces for 10 Gb/s.

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