| 摘要 |
PURPOSE:To improve the utilizing efficiency of a subscriber line and a relay line and also to increase the number of connection calls by receiving a request of a caller subscriber when the capability of an exchanger side has a margin with respect to an information speed requested by the caller subscriber. CONSTITUTION:A comparison discrimination circuit 25 recognizes a surplus capability of a CPU from a CPU operating rate measuring circuit 29, compares it with an estimated maximum packet speed S set by a caller and only when the surplus capability is larger than the S, the call is accepted. Then the transfer enable packet speed X at that point of time of each line is compared with an estimate maximum packet speed S are compared and when the speed X is lower than the speed S in either direction of incoming/outgoing caller subscriber line, the calling is rejected. Further, a line whose transfer enable packet speed X is lower than the estimate maximum packet speed S is eliminated among relay candidate lines. While remaining candidate lines are busy, a relay line having the least call number of the same speed class as the speed class having higher traffic to be set from the contents of the speed class in each direction of the traffic is used as on outgoing relay line and its line number is informed to a call setting/cut-off circuit 7. |
