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FTTX Deployment Techniques Compared for Quality
1. Quality in FTTX Deployments
David L Rottmayer
President & CEO
Unicorn Communications Inc.
Feb 2, 2014
Quality in FTTX Deployments
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2. Quality Techniques
Today's demand for FTTX networks has driven
various techniques that allow for quick
solutions to the networks, but not always
quality solutions meeting the networks. This
presentation explores the differences of these
techniques and their effect on quality and the
ability of the OSP network to meet the future
demands of the network.
Feb 2, 2014
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3. OSP Construction Quality Items
• Vibration
• Temperature Variations
– Thermal Line (aka Freeze Line)
• Slack Loops
– 5 Loops @ 20x OSD = 0.05dB Loss
– Bends after Splice points
• Splices
Feb 2, 2014
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5. Micro-Trenching
• Who is doing it in the USA
– Google
– Verizon
– AT&T
• Application
– Metro areas
– Temporary placement to meet demand
– FTTX applications
– Drop Cables
Feb 2, 2014
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6. Micro-Trenching
ITU-T L.49 MicroTrench Installation
Technique
Applies to routes
that involve
asphalted surfaces
such as roads or
sidewalks with a
base compact
materials (asphalt
or concrete)
Feb 2, 2014
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7. Micro-Trenching
Depth of groove in the asphalt
(concrete) not less than 7cm
(2.7in) but not penetrating past
the asphalt (concrete) layer
(Normally less than 20cm (7.5in))
19cm depth groove
Feb 2, 2014
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9. Micro-Trenching
• Fiber Cable should be a metallic (i.e. copper)
tube filled with a suitable compound and
surrounded by a PE jacket
– Optional to place micro-duct and then use
standard micro-duct fiber cables
• The groove is filled in with hot bitumen
varying from 100° - 170° C (212°- 338° F)
Feb 2, 2014
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10. Micro-Trenching - Weaknesses
•
•
•
•
Vibration effects
Thermal effects
Limited protection during road renovation
Difficulty during emergency repairs
Feb 2, 2014
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11. Mini- Trenching
• Who is doing it in the USA
– Most metro applications
• Applications
– Metro
– FTTX
– Long-haul
• Why
– Cost
– Impact to area and speed
Feb 2, 2014
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12. Mini- Trenching
ITU-T L.48 MiniTrench Installation
Technique
Applied on routes
what generally involve
asphalt (concrete)
surfaces with a
subgrade of compact
materials
Feb 2, 2014
Quality in FTTX Deployments
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13. Mini- Trenching
• Normal depth: 30 –
40cm (12 - 16in)
– Bottom of trench
• Normal width: 7 –
15cm (3 – 6 in)
• Cable or Duct
Placement without
spacers
• Backfill is by pouring
concrete with suitable
foaming additives
Feb 2, 2014
Quality in FTTX Deployments
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14. Mini- Trenching - Weaknesses
•
•
•
•
Thermal Effect
Vibration
Exposure to damage
Long term satisfaction of transportation
departments due to different wearing effects
of the road
Feb 2, 2014
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