Segment Count

Figure 17.5-1 Format of Par.5 (BillingID). (From IS-41.5-B. Reproduced with permission of TIA.)

Par.7 CallMode (one octet). This indicates the mode of the current call: analog or digital.

Par. 8 ChannelData (zero or three octets). If a mobile is using an analog voice channel, the contents field has three octets, and contains the color code (SCC) of the channel, the most recent mobile attenuation code (VMAC) sent to the mobile, and the channel number (CHAN) of the channel (see Section 12.4.9 for definitions of SCC, VMAC, and CHAN). If a mobile is using a digital traffic channel, the parameter appears in the message, but the length of its contents field is 0 octets.

Par.9 DenyAccess (one octet). This is an integer indicating the reason why an authentication center has determined that the mobile is not authentic, and should not be allowed to access the mobile network. The octet is usually coded "1" (reason not specified).

Par.10 DigitalChannelData (five octets). If a mobile is using an IS-54 TDMA traffic channel in a digital channel (Section 12.6.2), this parameter contains:

Channel Number (CHAN). This identifies a 48.6 kb/s digital channel (12.6.2).

Time Slot Indicator (TSR). A digital channel contains three TDMA traffic channels. TSR identifies the time-slot pair (1 and 4,2 and 5, or 3 and 6) used by the traffic channel.

Digital Color Verification Code (DVCC). This is the color code of a digital channel—see Section 12.6.2.

Digital Mobile Attenuation Code (DMAC). This is the digital counterpart of VMAC (voice mobile attenuation code)—see Section 12.4.9.

Par.11 Digits (variable length). This holds a string of BCD coded digits-see Fig. 17.5-2. The integer in octet 1 indicates the type of the digit string:

Octet 2 is not used. The code in octet 3 indicates that the number has the format of the U.S. telephone numbering plan, and that the digits are BCD coded. The integer in octet 4 indicates the number of digits. The digits are located in octets 5 through n.



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