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A potential deployment of PCE separates the computation element from the client (the PCC) that request computation services. Communications between the PCE and PCC are achieved using the Path Computation Element Communication Protocol (PCEP)<ref name=PCEP>RFC 5440 [http://www.rfc-editor.org/rfc/rfc5440.txt "Path Computation Element Communications Protocol"]</ref> which runs over the [[Transmission Control Protocol]] (TCP).
As the architecture has evolved, new protocol extensions have been developed to add functionality to support new applications and the new architectural elements. These developments are tracked by the PACE project<ref name=PACE>PACE [http://www.ict-pace.net/ "PACE: Next Steps in PAth Computation Element (PCE) Architectures"] {{Webarchive|url=https://web.archive.org/web/20161024222557/http://www.ict-pace.net/ |date=2016-10-24 }}</ref> which is funded by the [[European Union]]'s Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 619712.
The PACE project has developed a primer for those interested in PCE. It can be downloaded without charge from the PACE website.<ref name=primer>PCE Primer [https://web.archive.org/web/20160304071829/http://www.ict-pace.net/files/3313/8929/2782/PCE_Primer.pdf "PACE project PCE Primer"]</ref>
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