What does "POS" in a POS card mean

Packet Over SONET/SDH (POS) is a technology that transmits IP datagrams and other data packets over a SONET/SDH network.
POS technology maps data packets of variable lengths into SONET/SDH payloads and transmits packets at the physical layer of SONET/SDH. It provides a high speed, reliable, and point-to-point data connection.

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