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3300 ICP Hardware User Guide
68 Release 3.3
• Constant current design with the loop current set at 25mA. If the loop range extends pass
600 Ohm, this circuit will revert to a voltage feed of approximately 2xVdc (design dependant
parameter between 22-26 Vdc). The circuit remains active and the loop current will be
dependant on the external loop impedance.
• Supports a Ringing Equivalent Number (REN) of 3.
• Capable of on-hook transmission. Used in conjunction with a centralized resource to de-
liver calling line ID.
• Positive disconnect (removal of battery from the ring lead).
• Battery reversal (UK< LA< EU variants only - used for CLID).
• Ground button detection.
• Message waiting indication (dc voltage method).
• Message waiting indication (class message).
• Status led indicator per circuit.
• Low level diagnostics.
ONS Transmission Parameters (ASU)
ONS DC Supervision Parameters (ASU)
Transmission Parameters for NA Parameters for UK
Input Impedance 600 ohms 300R + (1000R // 220uF)
Balance Impedance 600 ohms 300R + (1000R // 220uF)
Digital Coding ITU µ-law – MT8966 CODEC ITU A-law – MT8967 CODEC
Transmission Parameters for LA Parameters for EU
Input Impedance 600 ohms 270R + (750R // 150uF)
Balance Impedance 600 ohms 270R + (750R // 150uF)
Digital Coding ITU µ-law – MT8966 CODEC ITU A-law – MT8967 CODEC
DC Supervision Parameters for NA/LA Parameters for UK/EU
Battery Feed -30Vdc feed, constant current set
at 25mA +/- 1mA
-30Vdc feed, constant current
set at 25mA +/- 1mA
Loop Resistance 600 Ohms (includes set) 600 Ohms (includes set)
Loop Detect Threshold 12mA 12mA
Flash Detect SW timed function from switch
hook detector
SW timed function from SWHK
detector
Ground button detect
threshold
13mA Tip or Ring to ground in off
hook state
13mA tip or Ring to ground in
the off hook state
Positive Disconnect SW timed function that breaks loop
current
SW timed function that breaks
loop current