Protocol Settings
R&S
®
EX-IQ-BOX
182
User Manual 1409.5570.32 ─ 05
Number of Groups
Determine the number of groups for a signal. The grouping enables to achieve arbitrary
sample rates that are not necessarily integer multiples of the CPRI basic frame rate. Each
group defines an AxC configuration for a certain time (means repetitions). Thus you can
change the AxC assignment over time by using more than one group with different set-
tings.
Remote command:
Auto
Automatically calculates the recommended scheduling sequences.
According to the standard, the following relations are taken as calculation basis:
S
C
S
f
)
f
,
f
(
LCM
K
K
S
N
ceil
N
A
C
S
N
K
N
N
A
C
V
C
C
S
f
)
f
,
f
(
LCM
S
LCM = Last Common Multiple
N
A
= 1
N
V
= Number of stuffing samples to match the CPRI frame rate of 3.84
MHz
S
= Number of active samples
f
s
= sample rate of digital standard
f
C
= CPRI basic frame rate (3.84 MHz)
The standard recommends the following settings for listed digital standards:
Table 7-7: IEEE 802.16 (WiMAX
TM
: recommended number N
V
of stuffing samples for N
A
=1, N
A
=2
fs [MHz]
N
A
S
K
N
C
N
V
= N
C
*K- N
A
*S
4.0
1
25
24
2
23
5.6
1
35
24
2
13
8.0
1
25
12
3
11
10.0
1
125
48
3
19
11.2
1
35
12
3
1
22.4
1
35
6
6
1
4.0
2
25
24
3
22
5.6
2
35
24
3
2
8.0
2
25
12
5
10
10.0
2
125
48
6
38
CPRI
Содержание EX-IQ-BOX
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