Page 84 - Reference framework for integrated management of an SSC - A U4SSC deliverable on city platforms

Figure 26: Optical fibre deployment strategy

In practice, the municipal corporate network will be constituted by proprietary infrastructure and
operator services in such a way that the objectives pursued of quality and availability are achieved
at minimum cost.

5.5.2 Voice and VPN Carrier Services

Communications operators offer telecommunication services that allow the municipal corporate
network to be connected with the outside, as well as enabling the integration of devices, systems,
switchboards (PBX), users and buildings that, for reasons of management, efficiency or costs, are
not directly connected to the municipal communications infrastructure.

Depending on the country, the converged voice, and data services that operators offer may vary,
as might their coverage. In general, these operator services offer fixed access based on Metro
Ethernet, GPON, xDSL standards, and others, as well as mobile (e.g., 3, 4, 5G, NbIoT). In addition,
they offer value-added services to connectivity, and guarantees of quality, availability and security
based on redundant infrastructures and service level agreements (SLAs).

For voice communications, telecommunications operators offer fixed/mobile/UC&C voice virtual
private network functionalities, as well as the integration of municipal voice communication systems.
The connection to or from the outside is made through consolidated ISDN access or SIP trunking.

As an example, the Spanish operator Telefónica offers a local network interconnection service on
Metro Ethernet + IP infrastructure (based on MPLS technology called Macrolan/SDN VPN-IP) that
allows the creation of virtual private networks while maintaining the same benefits as a private
network. 42

70 Reference framework for integrated management of an SSC | June 2023