The present invention relates to a coupler verification test circuit designed to assist personnel in installing a subscriber interface unit (SIU) on an optical fiber distribution network which does not have an operating head end, e.g. an operating office interface unit (OIU), during the installation procedure.
Optical fiber is becoming widely preferred over electrical wires for use in telecommunication networks, e.g. telephony and video. Though optical fiber has far superior bandwidth than electrical wires and is also immune to electromagnetic and radio magnetic interference, problems exist with optical fiber networks during installation and configuration thereof. Specifically, when installing a subscriber to an optical fiber system during initial system installation, oftentimes the system does not have an operating head end. Accordingly it is difficult to impossible for a craftsman to readily determine if SIUs are being correctly installed onto the network during SIU installation. After the head end has been installed and is operating it can easily be determined if any or all the SIUs are functioning properly. However, at that time, though it is possible to determine which if any SIUs have been improperly installed, it is troublesome and expensive to detach personnel to correct the problems causing severe inconvenience.