What does "POS" in a POS card mean

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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.

Other related questions:
Does the LTE cellular interface support PPP
The LTE cellular interface supports PPP. The following physical interfaces also support PPP: - Synchronous or asynchronous serial interface working in synchronous mode (the interface type is the serial interface) - Async interface working in protocol mode - Serial interfaces formed by CE1/PRI or CT1/PRI interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by CE3 or CT3 interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by E1-F or T1-F interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by E1/T1 channels that are channelized from a CPOS interface, which have the same logical features as synchronous serial interfaces - Cellular interfaces - ISDN BRI interfaces - POS interfaces Note: For LTE cellular interfaces, only the E392 data cards support the link-protocol ppp command.

Differences between POS and CPOS interfaces
Differences between POS and CPOS interfaces: A CPOS interface is a channelized POS interface with functions of timeslot multiplexing and demultiplexing. The CPOS interface can multiplex or demultiplex 2 Mbit/s signals from a 155M optical interface and can carry services with a minimum granularity of 2 Mbit/s. A POS interface is a service channel of a 155M optical interface with a minimum service granularity of 155 Mbit/s.

Do AR routers support POS interfaces
POS interfaces that AR routers support are described as follows: 1STM1, ISTM4, and 4STM1 interface cards support POS interfaces. Currently, AR2200, AR3200, AR3600, AR2200-S, and AR3200-S series devices support ISTM1, ISTM4, and 4STM1 interface cards. NE16EX series devices support only 1STM1 and 1STM4 interface cards. - A 1STM1 interface card provides a POS optical interface with a rate of 155 Mbit/s. - A 1STM4 interface card provides a POS optical interface with a rate of 622 Mbit/s. - A 4STM1 interface card provides four POS optical interfaces with a rate of 155 Mbit/s or a POS optical interface with a rate of 622 Mbit/s (interface 0 is available and interface 1/2/3 are disabled).

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