Review Paper on Fault Tolerant CEM Networks
Shetty, Nikhil, Sujata Priyambada Mishra · Zenodo (CERN European Organization for Nuclear Research) · 2020
Circuit Emulation (CEM) is a technique of creating a virtual connection of Time Division Multiplex (TDM) devices over an IP network. According to Nemertes Research report, 72% of the companies still use TDM infrastructure. Since TDM is a resource inefficient technique, this paper provides methods to transfer TDM information over IP network. This paper also discusses the challenges involved in the sending TDM information over IP and also provides techniques to overcome the issue. CEM is a technique of creating a virtual TDM connection over a IP network. IP network being a best effort delivery service faces various issues during emulation of a TDM connection. TDM being a guaranteed delivery service cannot handle packet loss which occur due to IP networks and all the packet loss must be compensated by the emulation service. In IP, the data can be fragmented and each fragment can travel through an independent path and this gives rise to jitter. If there is any inter packet jitter then it will be a huge issue during voice based application such as VoIP over TDM emulated network. Ways to overcome these issues in an efficient and effective ways has been discussed in this paper.