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Quick comparison
General Comparison of COD with Conventional Ducting System
| Description of comparison | C.O.D. | Conventional Method | ||
|---|---|---|---|---|
| Outer Duct | Inner ducts | Outer Duct | Inner ducts | |
| Raw material | H.D.P.E | H.D.P.E | P.V.C. | H.D.P.E |
| Length | No limit | No limit | 6 meters(At maximum) | No limit |
| (Up to 500m or 1,000m) | ||||
| Connection | No need (saves materials and accessories) |
In every 6 m | ||
| Insertion of inner ducts | No need | To insert | ||
| Intermediate Manhole | No need to build | To build in turning point | ||
| Horizontal alignment of inner duct |
Straight | Straight | Straight | Straight |
| Saves optic cable about 3 to 5% | ||||
|
Trench Dimension (Volume) (28mm inner ducts in 112mm outer duct) (Dimension) |
(No need man-working space: vertical cut) Up to 5 inner ducts 0.3m(W) x 0.6m(H) |
(Slope cut to secure man-working space) 3 inner ducts only 0.5m(W) x 0.81m(H) |
||
| Trench Bedding | Rough bedding (passes over/by hurdles) |
Fine bedding | ||