| 摘要 |
PROBLEM TO BE SOLVED: To establish easy replaceability of a jack accommodating base board for a plug of a head-set by connecting the base board with a control base board removably through a jack interface connector. SOLUTION: In a relay table of a telephone exchanger, a jack accommodating base board 2 on which a jack 3 to admit insertion of a plug of a head-set is mounted, is connected removably with a control base board 1 by a jack interface connector 4. If necessary, an impedance adjusting circuit 6 is mounted so as to suit the impedance characteristic of the head-set. When the jack 3 is to be replaced because of any failure or the life, it is prevented that the relay table stops operating for a long time, which ensures that an enhanced reliability is provided. |
