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3300 ICP Hardware User Guide
70 Release 3.3
LS Trunk Signaling Protocols (3300 Universal ASU)
LS Trunk Parameters (3300 Universal ASU)
Music On Hold (3300 Universal ASU only)
Four physical ports are supported for Music on Hold (MOH) on the 3300 Universal ASU.
The MOH interface supports the following features:
• 600 Ohm input impedance
• Signal level overload protection as mandated by FCC part 68 on encoded analog content
• Dry Tip/Ring interface (no battery)
• Always active input (no external control required or provided).
LS Trunk Signaling Supported Protocols
ASU Variant LS Protocol
North America (NA)
Latin America (LA)
TIA/EIA-464-B
United Kingdom (UK) UK Subscriber / Subsidiary Loop
United Kingdom (UK) UK Loop Start Disconnect Clear
United Kingdom (UK)
Europe (EU)
CTR-21
Trunk Functions Parameters for NA/LA Parameters for UK/EU
Input Impedance 600 Ohms 370R + (620R//310uF) (UK)
270R + (750R//150uF) (EU)
Balance Impedance 600 Ohms for short loop
application
350R + (1000R// .21uF) for
long loops
370R + (620R//310uF) (UK) 270R
+ (750R//150uF) (EU) for all loop
lengths
Min. operating loop current 18mA 18mA
Max operating loop current 100mA 60mA
Loop Current Limit None 60mA
Ring detector Threshold 30Vrms 20Vrms
Dummy Ringer load 10kOhms + 2.2uF (NA)
65Ohms + 2.2uF (LA)
10kOhms + 2.2uF
Reversal detector Detects CO battery polarity Detects CO battery polarity
Loop detect for CO disc. (no
battery)
< 2V across Tip and Ring < 2V across Tip and Ring
Meter Pulse Detection None 50Hz longitudinal (UK)
None (EU)
Note: The NA variant is designed according to the performance standard EIA/TIA 464C. The UK
Variant is designed in accordance with CTR21, but has design parameters favoring towards BS6305
and BS6450. The EU variant is designed in accordance with CTR21.