Cisco Model 6940 Four Port Optoelectronic Node 870 MHz 数据表
Model 6940 Collector/Terminator Node - 5-42/54-870 MHz
5
RF Section Specifications
General Station Performance
Units
Forward
Reverse
Notes
Passband MHz
54-870
5-42
Amplifier Type
- -
PHD
Push Pull
Frequency Response
dB
±0.85
±0.75
Return Loss
dB
16
16
Hum Modulation @ 12A
dB
65
65
Hum Modulation @ 15A
dB
dB
dB
65 (54-750 MHz)
60 (751-870 MHz)
60 (751-870 MHz)
65
Internal RF Test Points (
± 1 dB)
dB -20
-20
External RF Test Points (
± 1.5 dB)
dB -30
-30
Launch Amplifier Performance - Forward
Units
Forward
High Gain Port
Forward
Low Gain Ports
Notes
Operational Gain (minimum)
dB
29
24
4
Frequency Response
dB
±0.5
±0.5
Internal Tilt (
±1.5 dB)
dB 16.5
16.5 1,3
Noise Figure @… 870 MHz
750 MHz
650 MHz
550 MHz
54 MHz
750 MHz
650 MHz
550 MHz
54 MHz
dB 11
11.5
12.5
13.5
12.5
13.5
19
11
11.5
12.5
13.5
12.5
13.5
19
2
Reference Output Levels @… 870 MHz
550 MHz
55 MHz
550 MHz
55 MHz
dBmV 56.5
50
40
40
51.5
45
35
35
Reference Output Tilt (55-870 MHz)
dB
16.5
16.5
1,9
78 NTSC Channels (CW)
Composite Triple Beat
dB
59
69
6
Cross Modulation
dB
57
65
6
Composite Second Order (high side)
dB
64
69
6
Forward Insertion Loss
Optical Interface Board and Plug-Ins
Optical Interface Board and Plug-Ins
(Loss from optical receiver RF output to launch amplifier
RF input)
RF input)
Units
With Standard
Jumper Board
Jumper Board
Installed
With Status
Monitoring Jumper
Board Installed
Notes
Receiver position 1 and 2
dB
1.5
2.7
12
Unless otherwise noted, the above specifications reflect typical station performance at stated reference levels in the recommended
Operating configuration (s). Unless otherwise noted, specifications are based on measurements made in accordance with NCTA
Recommended Practices for Measurements on Cable Television Systems using standard frequency assignments and are referenced to 68
°F
(20
°C).