Maintenance signaling is compliant with SONET (Telcordia ® GR-253) and asynchronous (Telcordia ® TR-TSY-000191) network requirements. Alarm indication signals include SONET OC-n line AIS, STS-1 path AIS, virtual tributary (VT) path AIS, DS3 AIS, and DS1 AIS. Remote defect indication signals include STS-1 path RDI and VT path RDI. Other maintenance signals include STS-1 path unequipped, VT path unequipped, Loss of Signal (LOS, Loss of Frame (LOF), and Loss of Pointer (LOP).
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