Cisco Model 6940 Four Port Optoelectronic Node 870 MHz 数据表
Model 6940 Optoelectronic Node - 5-55/70-870 MHz
4
RF Section Specifications
General Station Performance
Units
Forward
Reverse
Notes
Passband MHz
70-870
5-55
Amplifier Type
- -
PHD
Push-Pull
Return Loss
dB
16
16
Hum Modulation @ 12A
dB
65
65
Hum Modulation @ 15A
dB
dB
dB
65 (70-750 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
Notes
Operational Gain (minimum)
dB
26
4
Frequency Response
dB
± 0.5
Internal Tilt (
±1.0 dB)
dB 9.5 1,3
Noise Figure @… 870 MHz
750 MHz
650 MHz
550 MHz
70 MHz
750 MHz
650 MHz
550 MHz
70 MHz
dB 11
11.5
12.5
13.5
18.5
12.5
13.5
18.5
2
Reference Output Levels @… 870 MHz
750 MHz
650 MHz
550 MHz
70 MHz
750 MHz
650 MHz
550 MHz
70 MHz
dBmV 47.5
45.7
44
42.5
35.3
35.3
Reference Output Tilt (70-870 MHz)
dB
12.2
1,5
64 PAL B/G Channels (CW) with digital
12
Composite Triple Beat
dB
75
6
Cross Modulation
dB
72
6
Composite Second Order (high side)
dB
71
6
64 PAL I Channels (CW) with digital
13
Composite Beat
dB
70
6
Cross Modulation
dB
72
6
42 CENELEC Channels (CW)
14
Composite Triple Beat
dBuV
111
Cross Modulation
dBuV
112
Composite Second Order
dBuV
115
78 NTSC Channels (CW) with digital
11
Composite Triple Beat
dB
73
6
Cross Modulation
dB
72
6
Composite Second Order (high side)
dB
73
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
Thru Jumper Board
Installed
With Status
Monitoring (SMC)
Thru Jumper Board
Installed
Notes
Receiver position 1 and 2
dB
1.5
2.7
15
Unless otherwise noted, the above specifications reflect typical station performance at stated reference levels in the recommended
operating configuration (s), and 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 20°C (68°F).
operating configuration (s), and 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 20°C (68°F).