| 摘要 |
<p>PURPOSE:To implement impartial and efficient transfer by providing an idle band information extract means, a transmission band limit means and an idle band information insert means in the controller to change the access band of the ring type ATM network depending on a data quantity to be sent. CONSTITUTION:An idle band information extract section 4 informs an access control section 7 of idle band information circulating on a relay transmission line 2 without interruption. When a band operating rate in an allocated band is very small by a transmission band control section 6, an access section 7 decides a new small transmission band based on the band operating rate and it is reported to the transmission band control section 6 to reduce the transmission band and the reduced band is reporter to an idle band insert section 5 as idle band information and inserted into a relay transmission line 2. When a band operating rate is very high, the access control section 7 increases the transmission band and informs the transmission band control section 6 of it and the idle band information is reduced by the increased band and it is reported to the idle band insert section 5, which inserts the band to the relay transmission line 2.</p> |
