Barrett 2050, Operating And Installation Manual

Page: 27 / 285

27 of 285
Selective Call –“Selcall”
Selcall is a digital signalling system based on standard CCIR-493 for use on HF
networks. Each station in an HF network can be assigned up to 10 self IDs of which
there can be a mixture of four or six digit IDs (identification). The station can be
called using any of these self IDs.
Selective Call “Telcall”
Telcall uses this digital Selective Call system to transport a telephone number from
a station on an HF network to a base station equipped with a telephone
interconnect unit to initiate phone calls onto the international telephone network.
Note:- For Selcall and Telcall functions to operate the transceiver must be fitted
with the Selcall or Telcall option and the channels enabled for Selcall operation.
If Automatic Link establishment (ALE) is in use refer to the ALE section for
operation details.
Special Notes When Using OEM 1 Selective Call Protocol
All six digit OEM 1 protocol calls will only be decoded by other Barrett transceivers
fitted with OEM 1 Selcall protocol or other manufacturers’ transceivers using
encryption.
OEM 1 protocol four digit calls will be decoded by Barrett 950 transceivers, Barrett
2050 transceivers using International four and six digit Selcall and other
manufactures transceivers with similar CCIR 493 based Selective Call systems.
Four and six digit GPS and Status data calls use the OEM privacy key to encrypt
the data. If this eight digit key has not been programmed by the programming
software a default privacy key of "99999999" is automatically used for transmission.
Six digit Pagecalls also use the privacy key but unlike the other calls the user has
the option to manually enable or disable the privacy key. When disabled the data is
sent as plain text. See “OEM Pagecall Key” in the protected menu “Selcall settings”
section, to switch the privacy key “On” or “Off” when sending Pagecalls.
Emergency GPS data calls, both four and six digit, are automatically sent as plain
text.