| 摘要 |
An FTTH (Fiber to the HOME) or FITL (Fiber in the Loop) system comprises a FSN (Fiber Service Node) accommodating various types of subscribers and a RT (Remote Terminal) connected through an optical fiber cable to the FSN and connected through a multiplex transmission line to a central office exchange. A test unit for performing a test of the subscriber is provided within the FSN. A test start message is issued through the central office exchange to the test unit of the FSN and the test results are received through the central office exchange from the test unit of the FSN. Communication between the RT and the FSN is carried out using overhead bits of multi-frames and according to a bit-oriented process. A test command transmitted from the RT to FSN does not include subscriber types and the test unit obtains that information from subscriber circuits. Therefore, the FSN becomes compact and costs are low.
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