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6-15-2 SYSCODE CALCULATION
The system codewor d is used when gener ating contr ol channel signalling as a system
identifier . When testing Radio Units, the cor r ect SYSCO DE allows the RU under test to
go into ser vice.
The SYSCO DE is actually constr ucted fr om a number of differ ent fields. The codewor d
is 15 bits long with the most significant bit ( B15) = 0.
B 1
B 1
B 1
B 1
5
4
3
2
0
0
O PID
0
1
O PID
B14 specifies whether the networ k is ter med a National Networ k ( 1) or a Regional
Networ k ( 0) . Depending on the setting of the Networ k type, the length of the O PID field
is either 7 bits or 2 bits and the NDD field 4 or 9 bits. The LAB field is normally set to
001 to allow any categor y r adio unit to access the system.
The NDD field generally contains a site identifier number for a multiple site network.
The easiest way to constr uct the SYSCO DE is to conver t each field into binar y with all
leading zer oes to complete the field width, then cr eate a 16 bit hexadecimal number
conver ting each four bits into a hexadecimal char acter 0- 9, A- F.
Example: A Radio Unit is pr ogr ammed for a r egional networ k, O PID=50, and has access
author ization for site ar ea 1.
O PID
= 94 decimal = 1011110 binar y
NDD
= 1 decimal
LAB
= 001 SYSCO DE = 2F09
B 1
B 1
B 1
B 1
5
4
3
2
0
0
O P I D
0
0
1
0
2
In many instances where the Radio Unit has unlimited access, authorization NDD may
be set to any value.
B 1
B 1
B 9
B 8
1
0
NDD
= 0001
B 1
B 1
B 9
B 8
1
0
1
1
1
1
F
6- 99
B 7
B 6
B 5
B 4
NDD
B 7
B 6
B 5
B 4
N D D
0
0
0
0
0
SECTION 6
OPTIONS
B 3
B 2
B 1
B 0
LAB
LAB
B 3
B 2
B 1
B 0
L A B
1
0
0
1
9
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