What Is TDM over Packet?
TDM is a well-known method for transmitting multiple calls over a single line, in which each ‘call’ is assigned a recurring timeslot on the line, and a small portion of that call is transmitted over the line each time its assigned timeslot is available. Unfortunately, TDM networks suffer from inefficiencies when the traffic pattern (the ‘calls’) are short and bursty (a characteristic of most data communications today). Hence, more recently, packet-based networks have been used as data traffic has grown.
But plenty of TDM services remain in the network and cannot simply be de-activated overnight. With packet-centric infrastructures almost universal, a smooth migration path to converged packet networks is necessary to support the large installed base of these legacy TDM-based services. This converged approach enables service flexibility and service delivery cost reductions—critical requirements that enable network operators to enhance and differentiate service offerings.
TDMoP is an approach that enables service providers to deliver legacy TDM services over a performance-grade packet network.
The approach is to make use of ‘pseudowires’ that emulate legacy telecommunications technologies while utilizing the growing and technologically advanced packet-based network to deliver even more services. This approach provides a seamless experience for the customer, regardless of the technology at the beginning or end of the connection.
Ciena’s packet-based products enable service providers to extend the life of their legacy assets. The broad product line, common Service-Aware Operating System (SAOS), and the OneControl Unified Management System simplify service deployment and ensure services perform as required.
Ciena’s 3932 Service Delivery Switch is an advanced Carrier Ethernet packet switch focused on high-bandwidth, multiservice applications requiring sophisticated Quality of Service (QoS) capabilities, including mobile backhaul, business services, and smart grid applications.
The 3932 is intended for use in 2G/3G mobile backhaul applications where legacy DS1s/E1s are required and pseudowire emulation is used to transport the TDM signals over the packet switched network. Its multiservice capability, alongside multiple timing synchronization options, provides the ideal solution for evolving legacy TDM-based services to a next-generation packet networking environment.
In addition to its industry-leading Ethernet capabilities, the 3932 provides for multiservice transport over Ethernet networks, allowing traditional TDM, Asynchronous Transfer Mode (ATM), and native Ethernet traffic to be carried over metro backhaul and core data networks.
- Structure-Agnostic TDM access (T1/E1 - SAToP)
- Structure-Aware TDM access (nxDS0/E0 – CESoPSN)
- Full support of the IETF’s Pseudowire Emulation Edge-to-Edge (PWE3) architecture over Ethernet and MPLS networks
- Support of MEF8 Circuit Emulation