OTE provides reliable and qualitative communication to all people in Greece, even in the most remote and inaccessible areas of the country, utilizing more than 35.000 km of optical fibers, numerous satellite, underwater and terrestrial international links.
Ιnfrastructure is also continuously upgraded, following the technological developments. The telephony network will be replaced by VoIP/IMS (IP-Multimedia-Subsystem) architecture. TDM digital exchanges, are gradually withdrawn, in order to be replaced by the modern All-IP network architecture within the following years.
OTE Group remains the largest national investor in new technology and infrastructure, as the last five years alone, the Group's investments in Greece have exceeded €2 billion. The Group implements new investments in infrastructure and new technologies to deliver integrated fixed, mobile, broadband and pay TV services. The Group has already announced investments amounting to € 1,3 billion for the next four years solely in Greece, a significant part of which pertains to New Generation Networks. Overall for 2015, OTE investment is estimated at €500 million, excluding spectrum acquisition costs.
The fixed access network refers to the network segment that connects the subscriber to the Central Office (CO). It is based on copper cables which are gradually being replaced by optical fiber cables due to investment in NGA (Next Generation Access) network. Specifically, OTE deploys a modern NGA network based on Fiber to the Cabinet – FTTC architecture, which brings optical fiber cables and active VDSL2 equipment on outdoor cabinets and offers broadband access services of up to 50 Mbps bandwidth.
We are proud of the fact that all broadband access in Greece (OTE and all other Providers) is based on our Access Network.
Supported technologies are:
Access Network is continuously expanded, covering the widest possible part of the country. At the end of February 2017 retail broadband customers reached 1.647.243, 238.436 of which were VDSL customers. The points of presence (PoPs) nationally (central offices and cabinets) are 7000 approximately whereas the installed ports reached the 2.282 approximately.
Additionally, hybrid access services are already offered (speed booster), which allow even greater access speeds by combining the bandwidth of the xDSL fixed access line with the bandwidth of the 3G/4G radio connection.
The Transport network is the platform that serve all the services offered by OTE group and aims to connect all kinds of circuits from the access network to the aggregation and Core network (and vice versa). The Tansport network of OTE group includes Next-Generation Synchronous Digital Hierarchy (NG-SDH) rings, Metro Ethernet nodes, wireless connections and Dense Wavelength Division Multiplexing (DWDM) optical rings, whose total capacity exceed 4 Tbps.
In order to meet increased traffic demands of the access network, transport network extends and upgrades continuously by installing new nodes, upgrading capacities and addition of terrestrial and submarine fiber optic cables.
Νew OTE Transmission Network, which is being developed is based on the MPLS-TP protocol and on the POTP platform (Packet Optical Transport Platform). This new platform is flexible enough to serve all the Packet-based broadband services with flexibility and expandability in the necessary bandwidth. New OTE Transmission Network will be implemented within the following three years and will also cover the rural areas of the country.
OTE's IP network has evolved to be the network on which all of the services offered are based upon (or are in the process of being transformed to be based on it – like VoBB).
The IP/MPLS-based network consists of 7 (dual) core nodes (Koletti, NYMA, Ermou Thessaloniki, Patras, Larissa, Herakleion,), more than 100 BNGs/BRASs that aggregate the broadband traffic and several other big routers dedicated to business services (SYZEFXIS, VPNs, LL etc).
All BNGs/BRASs are connected to diverse core nodes with at least 2x10Gbps links.The core nodes themselves, are interconnected by Nx10Gbps links to ensure the maximum possible quality of service & reliability. The core nodes at NYMA, Koletti & Ermou are also interconnected (in a resilient way) with our upstream provider (OTEglobe) in order to provide global Internet connectivity.
100Gbps links have been introduced between core nodes, as well as between IP core & OTEglobe. By the end of 2017 all the interconnections between core nodes will be N x 100Gbps.
OTE's IP network is topologically very close to the TeraStream concept (only 2 IP nodes between customers and services, IPv6 support end to end) which is the target architecture for all NatCos in DT group.
We are also in the process of consolidating the IP core networks of OTE & Cosmote, further enhancing the footprint of IP network and creating economies of scale.
OTE's IP core network supports dual stack operation (IPv6 protocol along with the former IPv4 protocol), as part of the preparations for future developments and services (internet of things, Machine2Machine etc), and will be the first network in the DT group (and the world probably) to offer IPv4 as a service over IPv6 using the LW4o6 technology and NFV elements (and solving the problem with IPv4 addresses exhaustion). Regarding IPv6 penetration, OTE is in thw top 20 providers worldwide.
VoIP/IMS: Within the frame of the network restructuring (Next Generation Network- NGN) and via the IMS platform, we will offer advanced voice and multimedia services (Presence, Messaging, Self-Care Portal) of low cost, since they are based on a Voice Over IP technology (VoIP) and centralized architecture.
COSMOTE TV: We offer a TV subscription service, over the broadband network as well as via satellite. Advanced services such as Replay TV or Video-On-Demand are already offered. OTE-TV-GO is also available to devices such as Smart-phones & Tablets and notebooks. Additionally, Hybrid TV Services (Hybrid SAT TV and IPTV) are offered, through which it is possible to SAT-TV subscribers to watch or store On-Denand content through the IP connection of the Set Top Box.
NGA FTTB/H-GPON: Within the frame of constant upgrade and restructuring of access network, OTE has begun -at a trial stage- the installation of optical fiber up to buildings (Fiber to the Building or FTTB) and up to the user/customer premises (Fiber to HOME or FTTH). The new Access Network is based on point-to Multipoint architecture, compatible with Gigabit Passive Optical Network (GPON) technology and with the ability to provide access speeds more than 100 Mbps and up to 1Gbps.
Moreover, OTE has already plans and is in the process of implementing the upgrade of the FTTC/VDSL2 network, in order to support Vectoring, which will allow access speeds up to 100 Mbps over the existing copper telephone lines.
Finally, the G.Fast and SuperVectoring technology is also evaluated at a trial stage, which will allow even faster access speeds via the use of the copper network (in short distances).