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Who can use the service?
The service is intended for Operators who wish to offer Broadband services to their customers, without investing in development of their own access networks and is designed to offer Operators the technical and operational tools required to use TIM broadband networks to access their own backbone networks. TIM's Bitstream package makes it possible to create broadband services designed according to the specific technical and commercial requirements of each Operator.
Description of the service
Bitstream offers a range of services that include supply by TIM of packet switching transmission capacities between the end customer's workstation and the Operator's backbone.
Two types of broadband network are available for these services: the first provides data carrier services using ATM technology, while the second uses Ethernet technology. In both cases, the equipment chain typically comprises three portions: access, delivery and backhaul.
The Ethernet Bitstream equipment chain is illustrated in the figure below.
Figure 1: Ethernet Bitstream reference architecture
The access portion refers to connection between the end customer's location and the relevant TIM exchange, where there is a device (typically a DSLAM - Digital Subscriber Line Access Multiplexer), that multiplies the flows of data generated by several end customers and prepares them for packet switching transport to the Operator's network.
The delivery portion comprises the equipment that connects the last element of the TIM network, the delivery node, with the Operator's network. This portion includes at least one Operator-dedicated “port” on the TIM delivery node, plus boundary devices where necessary acting as "edges", that is making the internal operation of the TIM network and that of the Operator mutually independent. Subject to technical checks to be conducted each time, all TIM DSLAMs and network nodes can potentially be used for delivery to the Operator's network.
At the request of the Operator, TIM can also provide transmission connections between the location of the delivery node and the Operator's location.
Backhaul covers the intermediate portion between the DSLAM and the point of interconnect to the Operator's network. The length of this portion may vary considerably, depending on the type of service selected by the Operator. For this purpose, the following options are possible:
Interconnect levels for the ATM Bitstream platform are shown in the figure below.
Figure 2: Interconnect Levels – ATM Platform
Access line configuration
The locations of the end customers are connected to the TIM broad band network through access lines that are able to carry broad band services. The transmission speed to be associated with each line is decided by the Operator, who can choose from a wide range of speeds.
The possible transmission speeds depend on the technological solution used for each line and on the related technical characteristics. The technological solutions now available include copper wire and fibre optic lines.
Configurations of both the “asymmetric” type, meaning that the speed from the network to the end customer is higher than the speed from the end customer to the network, and of the “symmetric” type are available for copper wire lines. Asymmetric type configurations are based on ADSL technology, while symmetric type configurations are based on SHDSL technology. For copper wire lines, the available speeds vary from 256 Kbps to 20 Mbps in the case of asymmetric access and from 1 to 10 Mbps in the case of symmetric accesses. The maximum usable speed depends on the length (attenuation) of the physical line that connects the end customer's location to the appropriate TIM exchange. In the case of asymmetrical accesses, the supply of the splitter at the end user's premises is optional. In the case of symmetrical accesses, the supply of the modem at the end user's premises is optional.
Asymmetric service can be provided on a shared line, that is it uses a line with a RTG/ISDN/WLR telephone subscription already existing, or in the “Naked” version in which a line dedicated to the asymmetric service is provided.
Fibre optic access lines are always of the symmetric type and are based on SDH technology. The speeds available for this kind of line are 34 and 155 Mbps.
The Bitstream xDSL service offers a wide range of SLA both for assurance and for provisioning.
Backhaul band configuration
Operators can use this configuration to choose the type of transport to be used on the network from the DSLAM to the delivery point and the related transmission capacity (band). In particular, they can choose between carrier service classes, as well as between two modes of band aggregation used by their end customers. With regard to this last aspect, the following modes of band aggregation are available:
Geographical Coverage Mode
Geographical coverage by Bitstream services depends on the TIM network that the Operator intends to use: ATM or Ethernet. Some types of service and some access speeds are available only in some areas of geographical coverage. Information on geographical coverage is updated every week.
Bitstream services are characterised by very widespread geographical coverage in that ADSL services operating at up to 7 Mbit/s are available on about 97% of the telephone lines while ADSL services operating at up to 20 Mbit/s are available on around 62% of the telephone lines (target for 2012, including lines served by installations, regardless of the distance from the related exchange).
If Operators need to co-locate their equipment at the TIM facilities, for example to set up interconnect transmission connections or for the interconnect mode to DSLAM, they must first apply to Wholesale TIM for the Co-location service. If an Operator intends to apply to Wholesale TIM for supply of interconnect connections, it must first subscribe to the Interconnect Flow package.
The Bitstream service has a price structure that can make the costs sustained by Operators variable. This structure is based on the following key elements:
Depending on their characteristics, Operators can personalise the services offered to their customers.
For more technical-sales information on this service, please contact your Account Manager.
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The offer is intended for Operators holding individual licences or general permits for telecommunications networks and services offered to the public, already in existence when Italian Legislative Decree no. 259 of 1 August 2003, setting out the "Electronic Communications Code", came into force (pursuant to Art. 38 of the Code), as last amended by Legislative Decree No. 70 of 28 May 2012, as well as companies holding general permits for electronic communication networks and services, pursuant to Legislative Decree no. 259 of 1 August 2003, as last amended by Legislative Decree no. 70 of 28 May 2012.
The Bitstream service offer is revised at least once a year, according to technological developments, market demand and changes to regulations. Each revision is subject to approval by AGCom (the Italian Communications Authority).
Please contact your Account Manager for further information.