Services Units and Gateways
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The Analog Services Unit rear panel provides
• Female 25-pair Amphenol trunk/line connector (ONS Tip/Ring or A/B circuits)
• Protective ground for grounding the chassis
• Input power connector (standard male IEC320 AC).
Universal Analog Services Unit
The Universal ASU is a combination unit that supports:
• 16 On-Premise Station (ONS) Lines for analog phones
• Four Loop Start (LS) trunks for analog connection to a central office
• Four Music On Hold ports (only one is software-supported) for connecting a MOH device
• Two Paging ports for connecting a loudspeaker paging unit
• Four System Fail Transfer (SFT) relays that provide direct connection between an analog
telephone and a Loop Start trunk in the event of a system or power failure..
The Universal Analog Services Unit front panel contains:
• 16 ONS circuit status LEDs
• Four loop start status LEDs
• One CIM port and status LEDs.
Figure 29: Analog Services Unit Rear Panel
Note: CLASS trunks are not supported on the Universal ASU.
Note: Custom Local Access Signaling Services (CLASS) allows the 3300 ICP system to
pass Calling Line ID digits and CLASS name information to ONS display sets that support
Caller ID functionality.
Figure 30: Universal Analog Services Unit Front Panel
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