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Packet over SONET/SDH
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<p>Packet over SONET/SDH, abbreviated POS, is a <a href="/facts/Communications_protocol/5uady7cB">communications protocol</a> for transmitting <a href="/facts/Packet_(information_technology)/xCYf8SJu">packets</a> in the form of the <a href="/facts/Point_to_Point_Protocol/XLaU6D71">Point to Point Protocol</a> (PPP) over <a href="/facts/Synchronous_optical_networking/G3LgtGS6">SDH</a> or <a href="/facts/SONET/G3LgtGS6">SONET</a>, which are both standard protocols for communicating digital information using lasers or <a href="/facts/Light_emitting_diodes/gE8x4MDb">light emitting diodes</a> (LEDs) over optical fibre at high line rates. </p><p>POS is defined by RFC 2615 as PPP over SONET/SDH. PPP was designed as a standard method of communicating over point-to-point links and is thus suited to SONET/SDH links because these use point-to-point circuits. </p>