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in areas where future excavation is anticipated, it may be advisable to place the cable at a greater depth.
For example, if road grading that will remove 610 mm (24 in) of dirt is planned in a particular area, it
would be wiser to initially place the cable at 1.2 m (4 ft) versus the standard
610 mm (24 in). - ✔✔True
placing all of the conduits during the initial conduit system installation is desirable,
if not mandatory.
*True
*False - ✔✔True
It is not always necessary to build new pathways for cable placement
*True
*False - ✔✔True
The length of a cable loop from the switch to a customer depends on three factors - ✔✔• Resistance of
the cable in ohms
• Signaling limits of the telephone and the terminating device switch in ohms
• Pair loading
Outside Plant (OSP) - ✔✔Telecommunications OSP cabling began with the placement of the first
telegraph system,
Cable Types - ✔✔• Optical fiber:
- 62.5/125 micrometer (μm) multimode optical fiber (OM1).
- 50/125 μm multimode optical fiber (OM2, OM3, and OM4).
- Singlemode optical fiber (OS1 and OS2).
,• 100-ohm balanced twisted-pair.
• 75-ohm coaxial.
Codes - ✔✔rules specified by governmental entities
Installation manuals are examples of - ✔✔Methodology
Support structures: - ✔✔- MHs).
- (HHs).
- Poles, support strands, and guying information.
The basic types of OSP pathways and spaces are: - ✔✔• Underground.
• Direct-buried.
• Aerial.
advantage to use optical fiber in backbones campus applications: - ✔✔• Increased distance.
• Higher bandwidth applications.
• All-dielectric cable.
• Less susceptibility to EMI and lightning.
• No crosstalk.
• No grounding (earthing) requirement for all-dielectric cable.
Optical Fiber Connectors: - ✔✔• LC
• SC
• ST
How to calculate passive cable system attenuation - ✔✔Total optical fiber loss
+ Total connector loss
,+ Total splice loss
Calculate link loss budget - ✔✔System gain - Power penalties
Splice loss values - ✔✔MM SM
SP type Avr. max. Avr. max.
Fusion 0.05 0.3 0.05 0.3
Mecha 0.10 0.3 0.10 0.3
Ribbon fiber - ✔✔designs can be single tube or multitube ,the fiber is bound in a flat array
Tight-buffered fibers - ✔✔have a 900 μm coating applied directly to the optical fiber.
A transition point shall be required for unlisted OSP cable when the termination
point is greater than _________ from the point of entrance and the cable cannot
be installed in a properly rated conduit. - ✔✔15 m (50 ft)
NEMA - ✔✔National Electrical Manufacturers Association
Most blown fiber systems publish maximum blowing distances of ____________ without
employing advanced blowing techniques. - ✔✔1 km (3281 ft)
ITU G.652D - ✔✔Singlemode, low water, nondispersion-shifted fiber [NDSF]
ITU G.655a and b - ✔✔Singlemode, nonzero dispersion-shifted fiber (NZDSF)
Cable core design - ✔✔- Filled
, - Dry water block
- Nonfilled
Sheath design - ✔✔- Optical power ground wire (OPGW)
- All-dielectric self-supporting (ADSS)
- Dielectric
- Self-supporting
- Armored self-supporting
- Metallic
Oversheath design - ✔✔- Stainless steel
- Coated steel
- Nothing over sheath
- Self-supporting
Wavelength - ✔✔- Multimode 850/1300 nm
- Singlemode 1310/1550 nm
- Singlemode, dispersion shifted 1550 nm
optical fiber color-code - ✔✔Fiber Color
1 Blue
2 Orange
3 Green
4 Brown
5 Slate
6 White
7 Red
8 Black