2.3.2 Characteristics
Terminal Equipment Loop Limit
• SLT: 600
Ω
including set
• Doorphone: 20
Ω
Minimum Leakage Resistance
15 000
Ω
minimum
Maximum Number of Extension
1 for SLT
Instruments per Line
Ring Voltage
75 Vrms at 20 Hz/25 Hz depending on the Ringing Load
Trunk Loop Limit
1600
Ω
maximum
Hookswitch Flash/Recall Timing
24 ms to 2032 ms
Range
Door Opener Current Limit
24 V DC/30 V AC, 1 A maximum