Generic Framing Procedure

<h2 id="frame-format">Frame format</h2>
<p>A GFP frame consists of:
</p>
<ul><li>a core header.</li>
<li>a payload header</li>
<li>an optional extension header</li>
<li>a GFP payload</li>
<li>an optional payload <a href="/facts/Frame_check_sequence/ywJNMuHd">frame check sequence</a> (FCS).</li></ul>
<h2 id="modes">Modes</h2>
<ul><li><i>Framed GFP</i> (GFP-F) is optimized for bandwidth efficiency at the expense of latency.  It encapsulates complete Ethernet (or other types of) frames with a GFP header.</li>
<li><i>Transparent GFP</i> (GFP-T) is used for low latency transport of block-coded client signals such as <a href="/facts/Gigabit_Ethernet/1ItIoV2w">Gigabit Ethernet</a>, <a href="/facts/Fibre_Channel/C7C0yreb">Fibre Channel</a>, <a href="/facts/ESCON/oYh25l0t">ESCON</a>, <a href="/facts/FiCON/sX4NCdzH">FiCON</a>, and <a href="/facts/Digital_Video_Broadcast/KPGNTGBJ">Digital Video Broadcast</a> (DVB).  In this mode, small groups of 8B/10B symbols are transmitted rather than waiting for a complete frame of data.</li></ul>

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Virtual_concatenation/K3j6LKTg">Virtual concatenation</a></li>
<li><a href="/facts/Link_Capacity_Adjustment_Scheme/qXX4KYWc">Link Capacity Adjustment Scheme</a></li></ul>
<h2 id="external-links">External links</h2>
<ul><li><a href="http://www.itu.int/rec/T-REC-G.7041/en">Download the G.7041 Recommendation</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Kazi, Khurram (2007-04-13). Optical Networking Standards: A Comprehensive Guide for Professionals. Boston, MA: Springer Science & Business Media. p. 153. ISBN 978-0-387-24063-3. <a href="978-0-387-24063-3" target="_blank">978-0-387-24063-3</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>"Generic Framing Procedure" (PDF). IEEE802. Retrieved 2025-06-01. <a href="https://www.ieee802.org/17/documents/presentations/may2001/gfp.pdf" target="_blank">https://www.ieee802.org/17/documents/presentations/may2001/gfp.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>Hernandez-Valencia, Enrique J. (2006). "Generic Framing Procedure (GFP)". Optical Networking Standards: A Comprehensive Guide. Boston, MA: Springer US. p. 153–188. doi:10.1007/978-0-387-24063-3_5. ISBN 978-0-387-24062-6. Retrieved 2025-06-01. <a href="978-0-387-24062-6" target="_blank">978-0-387-24062-6</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
</ol>

Generic Framing Procedure open-in-new

Generic Framing Procedure