| 摘要 |
PROBLEM TO BE SOLVED: To easily attain system construction not only through a DSL, HDSL, and DSI line (digital transmission line having the data transmitting amounts of 144 kbit/s, 776 kbit/s, and 1.544 Mbit/s in a base station interface) but also through a 2MDTI line (digital transmission line having the data amounts of 2.048 Mbit/s). SOLUTION: A base station interface unified to a 2MDTI line in addition to the other lines is normalized. A base station 200, base station controller 300, and base station interface converter 400 are made correspond to the interface. The converter 400 operates the conversion of the frame constitution of DSL/HDSL/DS1/2MDTI lines. At this point, in the frame constitution of the 2MDTI line, one frame constituted of 32 time slots with 256 bits is defined as a base, 20 frames as one multi-frame, and 0 time slot as a frame synchronizing time slot. Then, 6 time slots constituted of 48 bits are defined as one block unit from the first time slot, and 4 or 5 blocks are assigned until the 31th time slot as necessary.
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