Page 18 of 86 Operation procedures and tests553-2731-300 Standard 4.00 April 20009 Press DATASHIFT key atData Station A.DATA SHIFT lamp on. Data Station A shifts to datamode.10 Press RLS key. DDN, DATA SHIFT, andCONNECT lamps off.Data call disconnected. Voice callstill on hold.11 Press PDN key. PDN lamp on. Voice connection reestablished.12 Ask Data StationB to place a callto your DDN atData Station A.Data Station B DDN makes a datacall to Data Station A DDN. (Thisplaces voice call from DataStation B PDN on hold.)13 As Data Station Bcompletes dialingDDN of DataStation A.DDN lamp winks.DATA BUZZ on handset.14 Press DDN key(ADM set toMANUALanswer).DDN lamp on.CONNECT lamp on.PDN lamp flashes.DATA BUZZ off.Data buzz removed after 2 s orwhen called ADM answers. (NoDDN key depression is required ifADM is set to auto-answer.) PDNcall was automatically placed onhold. (Two-way hold now existsbetween data stations in thiscase.) See step 12.15 Press PDN keyon Data StationB.PDN lamp on. Simultaneous voice and data callsestablished between DataStations A and B.16 Press RLS key. PDN lamp off. PDN call disconnected; PDNlamp goes dark.17 Press DATASHIFT key.DATA SHIFT lamp on. Data Station A shifts to datamode.18 Press RLS key. DDN, DATA SHIFT, andCONNECT lamps off.DDN call disconnected. All ADMlamps go dark except POWER.Data station idle.Procedure 3Establishing simultaneous voice and data calls as viewed from an originating station(Part 2 of 2)Step Action Verification Comment