| 摘要 |
<p>Multiplexing/de-multiplexing sections 14, 15, 19 are respectively provided on STM-4 substrates B1, B2, STM-16 substrates C1 to C3, STM-64 substrates D1 to D3 to de-multiplex each of an STM-4 signal, STM-16 signal, STM-64 signal from a tributary transmission line LL into STM-1 signals. Then, transmission interfaces extending from the respective above substrates to time slot exchanging sections 2-0, 2-1 are all uniformed to STM-1 which is a basic transmission speed in SDH. <IMAGE></p> |
