3300 ICP Hardware User Guide
LS Trunk Signaling Protocols (3300 Universal ASU)
LS Trunk Signaling Supported Protocols
ASU Variant | LS Protocol |
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North America (NA) | |
Latin America (LA) |
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United Kingdom (UK) | UK Subscriber / Subsidiary Loop |
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United Kingdom (UK) | UK Loop Start Disconnect Clear |
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United Kingdom (UK) | |
Europe (EU) |
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LS Trunk Parameters (3300 Universal ASU) |
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Trunk Functions | Parameters for NA/LA | Parameters for UK/EU |
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Input Impedance | 600 Ohms | 370R + (620R//310uF) (UK) |
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| 270R + (750R//150uF) (EU) |
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Balance Impedance | 600 Ohms for short loop | 370R + (620R//310uF) (UK) 270R |
| application | + (750R//150uF) (EU) for all loop |
| 350R + (1000R// .21uF) for | lengths |
| long loops |
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Min. operating loop current | 18mA | 18mA |
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Max operating loop current | 100mA | 60mA |
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Loop Current Limit | None | 60mA |
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Ring detector Threshold | 30Vrms | 20Vrms |
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Dummy Ringer load | 10kOhms + 2.2uF (NA) | 10kOhms + 2.2uF |
| 65Ohms + 2.2uF (LA) |
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Reversal detector | Detects CO battery polarity | Detects CO battery polarity |
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Loop detect for CO disc. (no | < 2V across Tip and Ring | < 2V across Tip and Ring |
battery) |
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Meter Pulse Detection | None | 50Hz longitudinal (UK) |
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| None (EU) |
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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.
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).
70 | Release 3.3 |
