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Comparison of Working Flow
Previous Installation System(PVC Duct System)
Practical Using of Inner Space
COD PVC + COD sub duct system
Duct O.D (mm) Sub duct I.D (mm) No. of sub duct (Lines) Duct O.D (mm) Sub duct I.D (mm) No. of sub duct (Lines)
100.0 28.0 4 114.0 28 / 36 2 / 1 (3)
32.0 3
110.0 36.0 3
32.0 4
28.0 5
28 4
120.0 36.0 4
160.0 50.0 3
Practical Using of Inner Space
Connecting point (500~600m length manhole to manhole)
COD PVC + COD system
No need to connect 84~100 points (every 6m)
Connecting point (2000m length manhole to manhole)
COD PVC + COD system
4 points 334 points (every 6m)
Max. O.D of Optic Fiber Cable
  • The maximum diameter of Fiber Optic Cable to insert into the sub duct is as much as 80% of sub duct diameter while conventional PVC can only house up to 50% at maximum
  • Efficiency : 160%
  • Usable Fiber Optic Cable Outside Diameter
(Unit : mm)
28 32 36 50
COD 22.4 25.6 28.8 40
PVC+COD system 14 - 18 -
Excavation Quantities
  • As the required trench width is being required much less than that of the conventional method.
  • Less than 60% of conventional system
Damage from Earth quake
The Case of KOBE, JAPAN Earth quake
The date of occurrence : JAN. 17 1995 (7.2 Richter Scale)
The Extent of Damage
- Casualties : Death 6,432 / Injury 40,000
-Property : ¥ 9,000 Billion ($ 69 Billion)
Final Conclusion
COD PVC + COD system
Working Flow Steps 3 steps 5 steps
No. of Sub Duct Various Types Max. 3 ∼ 4 lines
Connecting Point No need Between Manhole and Manhole Every 6m
Max. Cable O.D to be inserted into sub duct
(Cable O.D / Sub duct I.D)
80 / 100 50 / 100
% of damage from Earth quake 0% Over 90%
Excavating depth Below 60% 100%