AT&T 555-600-736 manual

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When an Off-Premises telephone is connected to the LEGEND system via the 008 OPT module certain accessories must be used for grounding and protecting the system from power surges, electromagnetic interferences, and electrostatic discharges. These components are specified in Section 5 of the LEGEND System Reference Manual.

Service technicians should be aware that the 008-OPT module is the same as the 008-DID module except that the battery strap is in the On position for OPS, and in the Off position for DID. The factory presets the strap and labels the module accordingly, based on the DOSS order.

The OPT trunk from the CO provides -48VDC on the tip/ring interface to the OPT station.

The MERLIN Off-premises Telephone lnterface (OPTI) (PEC 2302-OPI) cannot be used with the LEGEND system.

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Contents

AT&T Merlin Legend Communications System Application Notes Page Merlin Legend Trunking Concepts Application Note Index Introduction to Trunking Concepts TIP and Ring ExplainedLines and Trunks LOOP-START Trunks Operations LOOP-START Trunks POTENTIAL-PROBLEMS Problem of GlareAutomated Attendant Ghost Calls and Loop-Start Facilities Proper Loop-Start Facility Applications LOOP-START Trunks When to USE LOOP-START TrunksUnavoidable Loop-Start Facility Applications Cost GROUND-START Trunks Operations GROUND-START Trunks Potential Problems GROUND-START Trunks When to USE GROUND-START TrunksDirect Inward Dialing did Trunks Operational Characteristics Did Trunk Signaling Characteristics Types of Loop Reverse-Battery SignalingAdministration Considerations in Using did Trunks TIE Trunks When to USE did TrunksSimple Tie Trunk Operation Tandem Tie Trunk Operation TIE Lines Signaling and Implementation Transferring Calls P E Transmit C E I V E ON-HOOK OFF-HOOK OFF Premises Stations Page DS1 Service Overview and OperationsDESIGN, Signaling & Implementation Potential Problems/LimitationsData Communications Equipment Do GBS Customers Need T-1?Channel Service Unit CSU Multiplexer MUX DS1 Facility Services IsdnSDN SID/ANI Special HOTEL/MOTEL Trunks Maintenance and TroubleshootingOperation Overview Hardware Module LINE/TRUNK Station Type Specifications TTR Trunk analog voice Reusable Modules from Merlin II R3 Administration ConsiderationsReferences