| 摘要 |
PURPOSE:To obtain simultaneously a large grouping effect by setting a channel retrieval sequence to each of different speed call classes and devising the retrieval sequence so as not to be overlapped with the retrieval sequence of other call class to the utmost thereby decreasing a fraction outgoing line effect. CONSTITUTION:In the case of a full rate, a retrieval start channel is selected according to the designation of slots 1, 5 of a carrier f1, the slot numbers 1, 5 are fixed and the channel is retrieved in the order of the carriers f1, f2, and when the channel is not set up to a carrier number f20, slot numbers 2, 6 are fixed and the channel is retrieved from the carrier number f1 similarly. Furthermore, in the case of a half rate, a channel of a slot 8 of the carrier f20 is set for the channel retrieval start channel and a retrieval pattern in the combination of the slot numbers 4, 8 is set in which the slot 4 is retrieved if the retrieval with slot 8 faciles and the channel is retrieved in the order of the carriers f20, f19,..., f1, and when the channel cannot be set up to the carrier number f1, the fixed retrieval pattern is changed into a pattern of retrieving slot numbers 7, 3 and the channel is retrieved in the descending order from the carrier number f20. |
