Reference · Glossary · 7 Terms
Glossary: O
Outside plant terms that start with O, in plain language, with links to the OSP map and the operations steps.
OLT
Also Called: Optical Line Terminal
Optical line terminal. The provider-side PON equipment, usually in the central office or a hub.
One-Touch Make-Ready
Also Called: OTMR
A process where one approved contractor does simple make-ready on all existing attachments, instead of each attacher in turn. Often shortened to OTMR.
- SOP Step: AE-03 Make-Ready Execution and Coordination
- See Also: Make-Ready, Simple Make-Ready
ONT
Also Called: Optical Network Terminal · ONU
Optical network terminal. The customer-side PON device. PON power is measured at its location before turn-up.
- See Also: OLT, PON, PON Power Meter
Open Trench
Also Called: Trenching
Placing duct in a dug trench with bedding, warning tape and compacted backfill. OSHA excavation rules apply.
- SOP Step: UG-08 Other Placement Methods
- See Also: Warning Tape, Compaction, Protective System
OTDR
Also Called: Optical Time-Domain Reflectometer
Optical time-domain reflectometer. Sends pulses down a fiber and reads the backscatter to locate and measure splices, connectors, bends and breaks.
- On the Map: OTDR with Launch Cable
- SOP Steps: SPL-11 Testing and Acceptance, SPL-13 Emergency Restoration
- See Also: Launch Cable, Bidirectional Average, Gainer, OTDR Trace, Dead Zone, Backscatter
OTDR Trace
Also Called: Trace
The OTDR's graph of returned light against distance. Loss shows as a slope or a step, and reflections show as spikes.
- On the Map: OTDR with Launch Cable
- SOP Steps: SPL-11 Testing and Acceptance, SPL-12 Documentation and Handoff, SPL-13 Emergency Restoration
- See Also: OTDR, Backscatter, Reflective Event, SOR File
Overlashing
Also Called: Overlash
Lashing a new cable onto an existing strand and cable. A third party overlashes only with the existing attacher's (cable owner's) permission. In FCC-regulated states the pole owner may require advance notice of no more than 15 days but not pre-approval (47 CFR 1.1416(a) and (c)); state rules and the attachment agreement vary.
- SOP Step: AE-09 Cable Placement and Lashing
- See Also: Lashing, Pole Attachment Agreement