Các sản phẩm trong những biểu tượng người dùng và mã sự lây lan là một chuỗi các chữ số phải được truyền đi ở 4 lần tốc độ của tín hiệu nhị phân ban đầu được mã hóa. Trong hình này, một mã số 4 chữ số được sử dụng. | CDMA 120 - cdmaOne and CDMA2000 Concepts and Terminology 80-13321-1 X11 Section 4 Physical Layer Rate Sets A Rate Set is a set of Traffic Channel frame formats. Each set is composed of 4 bit rates. A Rate Set may carry voice user data or signaling. Two Rate Sets are defined for use in cdmaOne systems. All services provided over the air interface must conform to one of these two rate sets Rate Set 1 supports a maximum of 8550 bps with an additional 1050 bits of overhead for a total max rate of 9600 bps. Rate Set 2 supports a maximum of 13 300 bps with additional overhead bringing the total transmission rate to 14 400 bps maximum. 2002 QUALCOMM Incorporated 4-9 CDMA 120 - cdmaOne and CDMA2000 Concepts and Terminology 80-13321-1 X11 Section 4 Physical Layer Service Options A Service Option is a service capability of the system. Service Options may be applications such as voice data or fax. TIA EIA Telecommunications System Bulletin 58 TSB-58 defines assigned Service Option numbers 1 8K voice 2 8K Mobile Station Loopback 3 EVRC Enhanced Variable Rate Coder 4 Async Data Rate Set 1 5 Group 3 Fax Rate Set 1 6 Short Message Services Rate Set 1 7 etc. Categories of Traffic Primary Traffic User voice Secondary Traffic User data other than voice Signaling Call control messaging 2002 QUALCOMM Incorporated 4-10 CDMA 120 - cdmaOne and CDMA2000 Concepts and Terminology 80-13321-1 X11 Section 4 Physical Layer Forward Traffic Channels The Forward Traffic Channels are used to transmit user data and signaling information. The Forward Traffic Channels are separated by their unique Walsh code assignments. Once the mobile is assigned a Walsh code in an omni cell or sector the code cannot be assigned to any other mobile in that omni cell or sector for the entire duration of the call. A Forward Traffic Channel can be composed of a Fundamental Channel and Supplemental Code Channels. The Fundamental Channel The Fundamental Forward Channel is used to transmit user data signaling and the .
