Home Glossary Glossary B C D I P S T Back to topB BIG Broadband Industry Group Back to topC CCBG Critical Communications Broadband Group Back to topD DMO Direct-mode operation Back to topI IWF Interworking Function Back to topP PSTN Public switched telephone network Back to topS SwMI Switching and management infrastructure Back to topT TBS TETRA base station TDMA Time-division multiple access TMO Trunked-mode operation