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Other Common Network Materials
1 Optical Distribution Frames
An optical distribution frame (ODF) is the interface between the outside plant cables (outdoor network) and the active transmission equipment. Typically these locations are somewhat larger in size and bring together several hundreds to several thousands of fibres.
Outdoor cables are generally terminated within an ODF using an optical connector. This normally consists of splicing a connectorised optical fibre pigtail to each individual fibre end.
In most cases, the ODF offers flexible patching between active equipment ports and the field fibre connectors. Fibres are identified and typically stored in physically separated housings or shelves to simplify fibre circuit maintenance and protect or avoid accidental interference to sensitive fibre circuits.
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Examples of ODF units
Cable Guiding System Internal optical "tie" cables are run between the ODFs and active equipment. A fibreguiding platform is built between the active equipment and the ODF cabinets. This provides a protected path for the internal optical cables to run within the central office in between 2 locations. |
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Examples of overhead cable guide systems |
Un-interrupted Power Supply (UPS) A UPS provides essential emergency power back up in case of external power supply failure. The Access Node may also require a second diverse external power supply which may form part of local & statutory requirement (provision of emergency services). Available UPS modules vary in size & depend upon the power requirement to be backed up. |
Example of Un-interrupted Power Supplies (UPS) units |
| Climate Control Suitable Air Conditioning plant is required to keep the Activate Equipment within environmental operation limits. The size & capacity of the unit will depend on the size of the equipment room to be served. |
Example of Air Conditioning Unit |
Access Node Security
The Access Node should be classed as a secure area therefore provision for fire & intrusion alarm, managed entry/access & mechanical protection against vandal attacked must be considered.
2 Patchcords and Pigtails
Patchcords are fibre optic cables that are fitted at one end (pigtail) or both ends (jumper) with a connector.
- The cable is available in two different constructions:
- 900 micron (typical) tube or buffer without any strength member
- 1.7 mm to 3.0 mm ruggedised cable. The construction is based mostly on a 900-micron tubing combined with aramid yarns as strength members and a plastic jacket over sheath
Cable regulation in Europe mostly requires that the polymeric materials for indoor wiring are LSZH-rated (Low Smoke, Zero Halogen) to prevent high smoke concentrations and toxic gasses when burned.
Various optical connector designs exist on the market. These are supplied without angle polishing (PC or UPC) and with angle polishing (APC).
· LC · MU · F3000 |
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