this interface plug-in module is used to connect an external hf data modem to the transceivers of the r&s® xk2000 family. it performs af level matching for different types of modems, configuration of the ptt line (v.28/ttl) and provides a serial control interface (of data link processor r&s® gs2200) to the external modem.
the modem interface allows the use of rohde & schwarz hf modems such as r&s® gm857c4 and c5, as well as of other qualified hf modems (assuming that link setup and arq/data protection is performed in the r&s® xk2000) or data processors (assuming a complete external set, including hf modem, data protection, i.e. arq or prp).
this interface is not required for operation with the internal hf.