Implementation of an FPGA based TDMoIP test system

OData support
Szántó Péter
Department of Measurement and Information Systems

Nowadays the use of packet switched transfers is spreading increasingly in the area

of telecommunication. The backbone network of telephony is rather become packet

switched network, including Ethernet, too. The holders and providers of networks

need devices, which are able to make transition between traditional TDM (Time

Divison Multiplexing) circuits and Ethernet networks.

FPGAs (Field Programmable Gate Array) are suitable tools for making complete

systems which are capable of multiplexing more TDM channels into an Ethernet

network. Synchronizing and clock recovery methods can be implemented in the

FPGA-s for synching TDM connections.

My thesis briefly reviews those TDM networks which are used for traditional voice

transmission, and the Ethernet. Following the review I explain the structure of TDM

over PSN (Packet Switched Network) in more detail.

The next section discusses a system design for implementing a PDH over Ethernet

unit outlined by me. After, I specify a clock recovery solution that is used for network


Next, I detail the structure of the hardware design which I have implemented in

Verilog language for FPGA-s.

Lastly, I describe the resource requirements of my hardware and outline possibilities

of how could this system be improved in order to utilize the bandwidth of the

Ethernet network effectively.


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