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1.4 Specifications
Installation Manual 23
1.4.2 Characteristics
Terminal Equipment Loop Limit • APT: 40 Ω
• SLT: 600 Ω including set
• Doorphone: 20 Ω
• CS: 65 Ω
Minimum Leakage Resistance 15 000 Ω minimum
Maximum Number of Extension
Instruments per Line
1 for APT or SLT
2 by Parallel connection of an APT and an SLT
Ring Voltage 75 Vrms at 20 Hz/25 Hz depending on the Ringing Load
Central Office Loop Limit 1600 Ω maximum
Hookswitch Flash Timing Range 24 ms to 2032 ms
Door Opener Current Limit 24 V DC/30 V AC, 1 A maximum
External Relay Current Limit 24 V DC/30 V AC, 1 A maximum
External Sensor Current Limit Power to the external sensor is provided from the DPH4 card and must be
grounded through the DPH4 card. For the connection diagram, refer to
"2.5.1 DPH4 Card". The PBX detects input from the sensor when the
signal is under 100 Ω.
Paging Terminal Impedance 600 Ω
MOH Terminal Impedance 10 000 Ω