check the auxiliary devices from the following aspects

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Before the installation, check the auxiliary devices from the following aspects:

Detailed plans are made for the capacity expansion and initial construction of the Digital Distribution Frame (DDF). The capacity of the DDF must be ascertained, based on the requirement of the project.
The optical transceiver is installed and tested.
Detailed plans are made for the layout of the fiber cables or trunk cables.
The fiber jumpers stretching from the connection box or the cables are correctly labeled.
The fiber cables or trunk cables pass the acceptance test.
The cable racks and cable distribution racks are installed.
The impedance of the trunk cables meets the requirements.
Detailed plans are made for the installation of the interfaces to the IP bearer network, including the routers and LAN switches, and the layout of network cables.

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