| 摘要 |
PURPOSE:To transmit the test type information to a division distributing stage, by providing a code-frequency converter and frequency-code converter respectively with a subscriber line test stand LTE and a subscriber line test device LTU. CONSTITUTION:After a channel from a subscriber trunk SUBT6 to a subscriber SUB12 via an LTU10 is constituted for test, when the key of test desired is depressed from an LTE1, the LTU10 forms required information to execute the test, and a code-frequency converter CFC2 makes the conversion into the combination of a plurality of frequencies or modulated frequency which can pass through a time division switch TDSW5. This frequency information is given to the channel and comes to the LTU10 via a TDSW5, status monitor signal insertion device D/I13, SUBT6, line concentration switch LSCW7. The LTU10 converts information into again a code information with a frequency-code converter FCC11, judges the types of test and prepares the reception of information from subscribers. |
