Competition within the telecommunications industry has never been greater. To ensure ongoing profitability, fixed network operators must increase operating efficiency and reduce recurring real estate, power, and maintenance costs. However, many telephony service providers find it difficult to evolve their business models given the constraints of legacy fixed TDM networks. Providers are paying a premium to find skilled labor and spare parts for platforms that have exceeded their expected deployment lives by decades.

Ribbon's Fixed Network Transformation solutions consolidate and modernize infrastructure, eliminating inefficiencies. Ribbon provides solutions to transform both the core IP and optical networks and the IP-based communications services that run on top of that network, helping service providers expand and improve business services as well as enter new markets like unified 5G xhaul and broadband backhaul. At the same time, these transformations reduce the cost and complexity of delivering traditional residential communications services by dramatically reducing recurring power, HVAC, space, and staffing costs.

The Time is Coming!

TDM and SONET networks are at the end of life.  The technicians are retiring, the equipment is aging, and the spares are sparse. Will your network be ready?


Consolidate And Modernize Your Legacy Fixed Network

Ribbon's experienced end-to-end transformation portfolio enables replacement of the following legacy switches: Nortel DMS-10, DMS-100, Siemens EWSD and DCO, CISCO BTS, Ericsson AXE, Alcatel-Lucent 5ESS, GTD5, and the CS2000. With Ribbon Professional Services team, operators can further evolve and transform their communications networks from legacy environments to secure IP and cloud-based architectures running on the latest technology and software releases.  With unparalleled experience and a track record of success, Ribbon applies proven, repeatable processes, proprietary purpose-built tools, and rigorous project governance to minimize risk, prevent service interruptions and to deliver on-time and with the highest quality.

To learn more about how to consolidate and modernize your legacy switches, visit: Fixed Network Transformation Solutions


Circuit Emulation Services


Packet Switch Network Diagram

TDM Aggregation

In this application the TDM aggregation network and the Packet Switched Network (PSN) are independent from each other. The TDM aggregation network is used to convert the TDM traffic into packet. This is then aggregated and handed off to the Packet Switched Network. The TDM aggregation network uses CES technology which can be provided by pluggables or CES service cards inserted into Neptune multi-access edge and aggregation platforms, depending on rates and density required. The PSN is the network operators existing network, and Ribbon has proven interworking with all the major IP network vendors.

Packet Switch Network Diagram

Legacy Service Migration

Historically, many enterprises leased SDH/SONET connectivity from service providers for their TDM traffic. However, IP/Ethernet is now ubiquitous for services and applications, with MPLS as the WAN transport technology. With the dramatic cost, footprint and power  reduction offered by MPLS over SDH/SONET, if enterprises migrate their TDM services to run on these MPLS networks they can dramatically reduce their leased connectivity costs.

Circuit emulation provides the mechanism to achieve this, with direct E1/DS1, DS3, and STM-1/4, OC-3/12 interfaces allowing existing services to be connected directly to the packet network. The packet network is able to provide a variety of resilience options, allowing it to achieve the same level or better service resilience than was provided by the legacy SDH/SONET network:

  • G.8032v1: Recommended for access protection
  • MC-LAG (Multi-Chassis Link Aggregation Group): Allows the traffic to be shared over multiple chassis, as well as providing redundancy in the event one of the chassis fail
  • LDP (Label Distribution Protocol): Used to provide end to end protection

Moving to a packet network has the added advantage of simplifying enterprise access. Running the SDH/SONET services on the packet network gives operators the opportunity to consolidate all enterprise services onto a single CPE, simplifying the expenses and complexity associated with running two networks. In addition, transitioning services from SDH/SONET to IP becomes far simpler for the Enterprise


Legacy Service Migration

Voice Trunk Migration

Voice Trunk migration requires the ability to:

  • Interconnect voice switches
  • Eliminate the TDM/SDH/SONET network
  • Leverage Ethernet and MPLS efficiency
  • Provide equivalent or better availability, resilience, and OAM than the legacy SDH/SONET network

Ribbon’s voice trunk migration solution uses standards-based circuit emulation (CES) approaches (SAToP and CESoPSN) to enable it to support all of the functionality required for voice trunks:

  • E1/DS1/DS3 hand-off
  • STM-N/OC-N hand-off to the voice gateway
  • 50ms protection switching
  • 10ms failure detection
  • Voice-grade Quality of Service (QoS)

Where required, deterministic packet transport protocols such as Segment Routing (SR), MPLS-TP, or RSVP-TE can be used. This new network is fully interoperable with existing IP routing and DWDM networks.


Packet Switch Network Diagram

Cloud Native Solutions for your Core Network


When it comes to the evolution of real-time communications, operators are striving to achieve a more flexible, software-defined, highly elastic way of building networks. Knowing that operators may begin this evolution at differing starting points, Ribbon has developed its solutions to support multiple migration paths to private and public clouds. These paths work in concert with your adoption plans for NFV, SDN, and the overall cloud infrastructure. To learn more about how to transform your core network to cloud-native architectures, visit:

Security and Analytics for Service Providers

Service providers can leverage Ribbon solutions to improve the security the overall network operations of their RTC networks.  Ribbon has the RTC security and analytics technology, so service providers can focus on their core competencies to their customers. Ribbon's family of next-generation session border controllers (SBCs) provide robust security, simplified interoperability, advanced session management, and carrier-grade reliability for fixed, mobile, cable and interconnect/wholesale service providers. Ribbon's SBCs offer powerful deployment flexibility that enables high levels of security and service quality for applications such as SIP trunking, Unified Communications, VoLTE, VoWi-Fi, RCS, and OTT. 

To learn more about securing and troubleshooting your real-time communications architectures, visit:

Market-Disrupting 400G ZR+ Solution

By using a new generation of 400G ZR+ pluggables in a CFP2 DCO form factor in an innovative way, Ribbon shows how we can transport 100GbE, and growing 400GbE client traffic, for longer distances and at lower costs than current 800G solutions. Moreover, we do this on a future-proof 75GHz grid channel plan.

400G ZR+ Whitepaper

Moving Forward with Open Optical Networks

Intent Based Automation

With intent-based automation the return on investment in the IP infrastructure is maximised. A programmable IP infrastructure in conjunction with SDN and integrated plan, build, control and maintain ensure network utilization is maximized over the network lifecycle and intelligent path computation with multilayer optimization ensure network utilization is maximized without compromising SLAs. The Muse SDN Domain Orchestrator provides this automation.

MUSE SDN Brochure

Network Simplification

A consolidated multiservice platform provides the network simplification required to streamline operations, reduce cost, accelerate service velocity and improve network and service performance. With multiservice being the DNA of Ribbon’s IP portfolio we have proven credentials for supporting current, legacy and new services across both IP and seamlessly integrated IP Optical networks.

Ribbon achieves this network simplification with:

Multi-Access Edge:

  • Access Edge Routers for Enterprises
  • Access Routers providing a flexible RAN Edge
  • Mission Critical Access Routers for Critical Infrastructures
  • Smart Pluggables for Access technologies such as GPON and TDM

Converged Multiservice Aggregation:

  • Full IP/MPLS feature set
  • Advanced timing
  • Evolution to SRv6
  • TDM Migration

Service Aware Traffic Steering:

  • SDN Networking
  • Intelligent Path Computation
  • Network Slicing
  • Converged multilayer optimized IP Optical

Neptune Metro IP Transport

ACG Report - The Economic Benefits of a Super-Converged Multi-Access Edge Network

Call Trust - Robocall and Fraud Mitigation

What do your customers do when they receive a phone call from someone they do not know or a number they do not recognize? Perhaps they answer it, but far more likely they reject it, send it to voice mail, or just ignore it. In our current telecommunications world, everyone does this, because they are barraged by spam and robocalls and assume the worst – someone wants to pitch something I do not need or want, or this will be an attempt to defraud me.

With Ribbon Call Trust you now have a solution that you enables you to restore their trust in the phone. Even if you have an extension to the FCC requirement to implement STIR/SHAKEN, you still need to comply with the mandate to have an originating robocall mitigation program in place. With Ribbon Call Trust you can commit to your customers that you can meet the FCC mandate. In addition, you can add more value by being able to provide terminating robocall and fraud mitigation so your customers will be at much less risk from bad actors trying to get their private information or trying to prey on them with money scams.

Identity Assurance