| 摘要 |
PURPOSE:To achieve a test under the same conditions with actual use by using both a general telephone set and a system-testing telephone set for an additional service system connected subordinately to a public telephone network. CONSTITUTION:For a test of a reception system trunk, a system-testing telephone set B-TEL connected to a testing lead-in arrester spring originates and a trunk 11 for acceptance terminates through the testing lead-in arrester spring. Consequently, the trunk 11 and various trunks 13 are tested. A connection-system trunk, on the other hand, is tested by originating and incoming telephone set kinds A-TEL and B-TEL by using three kind of patterns. |
