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        Advantage

        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%