5.4 Specifications — KX-TDA30Installation Manual 2435.4 Specifications — KX-TDA305.4.1 General DescriptionSwitching Non-blockingAC Adaptor AC Input 100 V AC to 240 V AC, 1.5 A, 50 Hz/60 HzDC Output 40 V, 1.38 A (55.2 W)DC Input • DC IN 1: 40 V, 1.38 A (55.2 W)• DC IN 2: 40 V, 1.38 A (55.2 W)External Battery +36 V DC (+12 V DC × 3, battery capacity of 14 Ah or belowrecommended for each external battery)Maximum Power FailureTolerance300 ms (without using backup batteries)Memory Backup Duration 7 yearsDialling Trunk Dial Pulse (DP) 10 pps, 20 ppsTone (DTMF) DiallingExtension Dial Pulse (DP) 10 pps, 20 ppsTone (DTMF) DiallingConnectors Trunk RJ45/RJ11 (2 wire) × each trunk portExtension RJ45/RJ11 (4 wire) × each extension portPaging Output 1 conductor jackExternal MOH(Music on Hold)Output1 conductor jackMode Conversion DP-DTMF, DTMF-DPRing Frequency 20 Hz/25 Hz (selectable)Trunk Loop Limit 1600 maximumOperatingEnvironmentTemperature 0 °C to 40 °CHumidity 10 % to 90 % (non-condensing)Conference Call Trunk From 10 × 3-party conference call to 4 × 8-party conference callMusic on Hold 1 port (Level Control: -11 dB to +11 dB in 1 dB steps)Selectable Tone/External Music Source portPaging Internal Level Control: -15 dB to +6 dB in 3 dB stepsExternal 1 port (Volume Control: -15 dB to +15 dB in 1 dB steps)Serial InterfacePortRS-232C 1 (maximum 115.2 kbps)USB 1