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Direct Inward Dial (Did)/Loop Trunk; Figure 15: Direct Inward Dial (Did)/Loop Trunk - Mitel SX-200 EL Technician's Handbook

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Troubleshooting and Repair

Direct Inward Dial (DID)/Loop Trunk

You use the Direct Inward Dial (DID)/Loop trunk primarily in analog DID
applications; rarely in PBX-PBX Loop Tie trunk applications.
This trunk uses current reversal to signal supervision information and
provides digit flow capability in both directions, when the trunk is in the
loop/tie mode.

Figure 15: Direct Inward Dial (DID)/Loop Trunk

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