| 摘要 |
A SERVICE SWITCHING POINT (4,6,8,10) COUNTS THE NUMBER OF PENDING QUERIES SENT TO A SERVICE CONTROL POINT (2) AND AWAITING A RESPONSE. WHEN THE COUNTED NUMBER REACHES A THRESHOLD, FURTHER CALL ATTEMPTS ARE REJECTED. THIS PREVENTS THE LOAD ON THE SERVICE CONTROL POINT (2) FROM BECOMING EXECESSIVE.(FIGURE 1)
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