Final Report
Chapter 9 Environmental and Social Considerations
routes interlinking large type switching nodes, core transmission routes connecting large type
switching nodes and small type nodes within a city, and metro transmission routes connecting
telephone offices in a large city. In this project, it is planned to make the most of existing MPT
facilities, but public roads will be used for some transmission routes and access links.
In terms of environmental and social considerations, for transmission routes, the optical fiber
system (underground duct system or aerial cable system) and the point-to-point radio system
between nodes, for access links, the optical fiber system for access link use (underground cable
system or aerial cable system) and the point-to-multipoint radio system between node users are
available as alternative routes and are still to be selected.
A comparison of transmission routes is shown in Table 9.3-1.
Table 9.3-1 Applicable Technologies/Alternative Routes and Operating Methods
Fiber Optic Cable
Radio System
(Point to Point)
Underground
Aerial
Capacity
１～1,000 Gbps/core
100～150 Mbps/Sys
MPT Application
48 core or more
Security
Strong
・Side walk
Location of Construction
(Public Road)
48 core or less
Method of
construction
Construction
route
Construction
timing
・Side strip
・Open cut at Public
road and lay duct and
recovery of road
・ Minimum distance
route related to
distribution
of
demand area
・Duct construction in
advance
・FOC installation on
demand
Weak
・Side Strip
・Pole erection on
10-20m distance
・Attach to pole
・ Minimum distance
route related to
distribution
of
demand area
・Metro Cities’
surrounding areas
・Suburban areas
Installation Cost
Yen 2 Mil/km
(48 core cable)
Yen 1.6 Mil/km
(24 core cable)
Social
No relocation of
No relocation of
Environment
residents
resident
Environment
Applied Sections
Environment
Application to proposed
project
・Impact to plant at side
walk
・Recovery after
completion
Apply to Center of
cities
None
None
・On demand
・Core, Metro Network
in Metro Cities
・Backbone network
Natural
Strong
None
・Rural areas
・Branch to small sized cities
from backbone
・MSC to small base station
Yen1.5 Mil/section
No impact
No impact
No impact
Apply to suburban
cities
Not applicable
Source: Prepared by the Study Team.
The optimum routes for laying optical fiber cables in this project will be selected on a
9-11