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Specifications
Release 3.3 69
ONS Ringing Parameters (ASU)
ONS Message Waiting Parameters (ASU)
LS Trunk Specifications
LS Trunk Features (3300 Universal ASU only)
Four Loop Start (LS) trunk circuits are supported by the 3300 Universal ASU with the following
features:
• Loop Start trunk capability only
• 50Hz meter pulse detection over a second T/R pair is supported on the UK variant
• Loop disconnect detection
• Loop reversal detection
• Incoming ringing detection
• Status led indicator per circuit
• Low level diagnostics
• Power Cross-protection as specified by CSA/UL 950 Safety Specifications
• Lightning Protection as specified by FCC Part 68/CS-03.
Ringing Parameters for NA/LA Parameters for UK/EU
Voltage 65 Vrms sinewave superimposed
onto –48Vdc
65 Vrms sinewave superimposed
onto –48Vdc
Frequency 20Hz 25 Hz
Trip Battery
Silent interval
Ring Interval
-30Vdc
-50Vdc
-30Vdc
-50Vdc
Number of bridged ringers 3 3
Max. bridged capacitance 3uF//15kOhms 3uF//15Kohms
Ring Trip detect time HW detector response <100ms
HW ring trip overrides application
of ringing signal
HW detector response <100ms
HW ring trip overrides application
of ringing signal
SW ring trip response time Within 50ms of switch hook detect Within 50ms of switch hook detect
Message Waiting Parameters for NA/LA Parameters for UK/EU
Voltage -115Vdc +/- 5V dc -115Vdc +/- 5V dc
Source Impedance Between 2k and 4K Between 2k and 4K
MSW trip SW control, interlocks with
application of ringing
SW control, interlocks with
application of ringing
Flash Rate Cadenced, SW controlled. 300ms
on/1500ms off cont.
Cadenced, SW controlled. 300ms
on/1500ms off cont.