302693-B Rev 00
2-11
Hardware Installation
Figure 2-3 Setting Return Attenuation When Combining Multiple Returns
Set the Forward Channel Output Level
The CMTS 1000’s downstream frequency plan complies with Harmonic
Related Carrier (HRC), Incremental Related Carrier (IRC) or Standard
(STD) North American frequency plans.
The CMTS 1000 outputs an RF modulated signal with the following char-
acteristics (partial listing):
• Center Frequency: 91 to 857 MHz ±30 KHz
• Level:
Adjustable over the range 50 to 61 dBmV
• Modulation Type:
64 QAM and 256 QAM
Setting the CMTS 1000 forward channel’s output power level is accom-
plished via an SNMP MIB variable. This procedure is not available as of
this printing.
B
A
C
D
E
F
30 dBmV
6 dB
24 dBmV
28 dBmV
25 dBmV
3 dB
25 dBmV
25 dBmV
26 dBmV
3 dB
23 dBmV
27 dBmV
3 dB
24 dBmV
24 dBmV
24 dBmV
-11 dB
8 -Way
Combiner
+13 dBmV
12 dB Attenuator
CMTS 1000 RF in +1 dBmV
Содержание CMTS 1000
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