| 摘要 |
<p>The invention relates to an arrangement for determining a transmission delay in a subscriber network, comprising (a) several subscriber sets (102), (b) several subscriber terminals (101), whereby to one subscriber terminal is connected at least one subscriber set (102) by means of a transmission connection (111) to be implemented in an electrical form, and (c) a central unit (103), which is common to the several subscriber terminals and connects the subscriber sets to a public switched telephone network. In the subscriber network, a time-division data transmission between the several subscriber terminals and the central unit occurs along a common transmission path (110). According to the arrangement, a value representing the transmission delay between the central unit and an individual subscriber terminal is determined, whereby a transmission of the subscriber terminal (101) towards the central unit (103) is synchronized in the subscriber terminal with a frame structure of a signal to be transmitted from the central unit towards the subscriber terminal. To be able to perform the determination quickly by using a simple equipment and by utilizing the transmission capacity efficiently, there is a specific message transmission time slot in the transmission frame for a transmission from the subscriber terminals (101) towards the central unit (103), whereby the determination of the value representing the transmission delay is performed in the central unit (103) from a message transmitted by the subscriber terminal in said message transmission time slot, by measuring the location of the received message in relation to the frame structure of the signal to be transmitted from the central unit towards the subscriber terminal.</p> |
