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參數(shù)資料
| 型號： | CM1481 |
| 英文描述： | Non-Predictive Selcall Module |
| 中文描述： | 非預(yù)測Selcall模塊 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 162K |
| 代理商： | CM1481 |
19
Functional Descriptions ......
Example
Over-Air
Transactions
Figure 11 (below) shows, in diagrammatic form, the sequence of tones for an Over-Air
Re-Configuration of the Tx Address between the controlling base station and the CM1481.
Figure 13 shows the complete range of tone sequences to be used with the CM1481. For
Over-Air transactions follow the steps illustrated in Figure 11 substituting the required
action in STEP 1 with the required request and confirmation from Figure 13. Note the use
of the Data Prefix tone “B” in the data field; all operations must conform to the HSC
Operational Rules which are described on the following pages.
4
0
B
Rx Address Tones
New Tx Address Tones
+ Data Prefix
STEP 1
Over-Air Re-Configuration Request (Tx Address)
-
from base
DATA
Prefix
B
TONE
TONE
2
s1
s2
s3
Old Tx Address Tones
SEED Tones
s1, s2, s3
STEP 2
Security Check (SEED)
-
from CM1481
B
3
k1
k2
k3
Rx Address Tones
KEY Tones
k1, k2, k3
STEP 3
Security Reply (KEY)
-
from base
B
8
New Tx Address Tones
STEP 4
Configuration Confirm
-
from CM1481
B
Tone 1
Tone 1
Tone 2
Tone 2
Data
Prefix
Tone 3
Tone 3
Tone 4
Tone 4
Tone 5
Tone 5
Fig.11 Example Over-Air Re-Configuration Tone Transaction
Pseudo-
Random
Number
Information
The figure below shows the pseudo-random number generation in diagrammatic form.
The base unit controller's software and circuitry will require to emulate this function.
The SEED is a random 8-bit number produced by the CM1481. The SEED is loaded into
the register and shifted right by the amount of steps configured as: Pseudo Iterations.
Note the Exclusive-OR functions.
The result is the KEY.
Fig.12 An 8-Stage Pseudo-Random Counter Employing Exclusive-OR Feedback
Parallel "SEED"
/
Parallel "KEY"
Register Shifted Right 1 Step per Configured Iteration-Step
Ex-OR
s1/k1
s2/k2
s3/k3
Feedback
7 MSB
6
5
4
3
2
1
0 LSB
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