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Bitstream NGA and VULA
The Bitstream NGA and VULA services are addressed to all the licensed OLOs wishing to offer ultra-broadband services to their end customers through the New Generation Network of TIM without having to deploy their own access networks. The services provide all the tecnical and operational elements to allow OLOs to connect their own backbones to TIM ultra-broadband access network. The Bitstream NGA and VULA offer can provide ultra-broadband services that can fit the specific technical and commercial needs of any OLO.
The Bitstream NGA service
The Bitstream NGA service is the provisioning of packet switching bandwidth from an end user to its OLO’s backbone.
Traffic delivery to the OLO can be done through different kinds of connection to TIM network. Anyway it always requires the use of a proper dedicated end device for any OLO (though Telecom Italia also offers the possibility to share end devices among different OLOs), that must be connected to specific nodes of the TIM network that are designed for this purpose. The delivery end devices work as “edge” devices, meaning that they are used to make Telecom Italia and the OLOs networks mutually independent.
When either the connection to Parent Node or the connection to Distant node is adopted, Telecom Italia offers the possibility to deliver both the Bitstream NGA and the Bitstream Ethernet on the same delivery kit, provided that the proper conditions are verified to do so.
Backhaul and traffic carrying through different feeder nodes
The backhaul component is the traffic carrying from the end customer access line to the OLO network. Different models are available for traffic aggregation, together with different Classes of Service (CoS).
The following CoS models are available:
The OLOs can request bandwidth changes at any time, that will be provided without interrupting the service.
The access portion is the link between the end customer and its associated TIM exchange node (where the OLT is located), and varies according to the access technology on the customer side:
FTTCab/VDSL2: Like ADSL lines, the end customer has a local loop through which it can use both the PSTN service (that may also be offered through the Wholesale WLR service) and data connectivity service, the latter in VDSL2 technology (Very High Speed DSL 2). Data connectivity service requires the customer to have a VDSL2 modem (not included with service provisioning). The customer local loop is terminated on a cabinet (tipically located near the customer home/office) on the top of which a ONU (Optical Network Unit) is installed. ONUs are equipped with splitters that split the baseband voice channel (where active), which is terminated on the TIM phone exchange, from the ultra-broadband data channel. ONUs in turn are connected through fiber links to their associated OLTs (Optical Line Termination), that are located in Telecom Italia exchange nodes and that terminate the ultra-broadband channels (most of the times, OLTs are located in the same phone exchanges where PSTN lines are terminated, but not always).
The demarcation point between TIM and the OLO is the network termination located at the end customer’s home/office, where the VDSL2 modem is connected.
FTTH: The end customer has a fiber in its home/office. When the access line is activated, TIM will bring and install an OTO (Optical Telecommunications Outlet) and an ONT (Optical Network Termination) in the customer’s environment. The customer Premise Equipment (CPE) that will be connected to the ONT is not included with the service provisioning). The fiber in the customer’s living environment is terminated on an OLT located in the Telecom Italia exchange node, according to GPON network architecture.
Different profiles are available for VDSL2 and FTTH accesses: at present, only asymmetric profiles can be requested for VDSL2 (with downstream speed greater than upstream speed), while both asymmetric and symmetric profiles (upstream speed equal to downstream speed) can be requested for FTTH.
Moreover, up to 4 User VLANs can be associated to any access line: they can be either single-CoS or multi-CoS VLANs, but it is requested that they fit the backhaul traffic model the access line has been associated to.
The VULA service
The VULA (Virtual Unbundling Line Access) service is about the same as the Bitstream NGA service, except for some specific aspects that are detailed in the following.
Traffic delivery to OLOs is done uniquely at an “exchange node level”. In other words, the VULA service allows OLOs to collect only traffic from/to end customers of any single TIM exchange node where an OLT is installed. Any OLO wishing to use VULA to collect traffic from/to more than one exchange node will have to request VULA delivery for each desired exchange node.
As for traffic aggregation and quality management, only the “Dedicated bandwidth multi-CoS model” is available for the VULA service. Besides, it is important to point out that unlike the Bitstream NGA service, the backhaul bandwidth component is not charged at all in the VULA service.