Cisco Model 6944 Four Port Optoelectronic Node 870 MHz with 42 54 MHz Split 数据表
Model 6944 Four Port Optoelectronic Node – 5-42/54-870 MHz
10
RF Section Specifications, continued
Launch Amplifier Performance - Reverse
Units
Reverse
Notes
Frequency Response
dB
+/- 0.5
11
Internal Tilt (+/- 1 dB)
dB
-0.5
11
Insertion Loss
dB
- 3.5
8,11
Station Performance - Reverse
(Station port input to optical transmitter input)
Units
With no
segmentation
With Dual
segmentation
With Quad
segmentation
Notes
Amplifier Type
--
PP
PP
PP
Path to Path Isolation
dB
na
> 50
> 48
14
Insertion Loss
dB
-3
-3
-3
9,11
Noise Figure
dB
14.5
14.5
14.5
10,11
Reference Output Levels @ 5 and 42 MHz
dBmV
14
14
14
7
6 NTSC Channels (CW)
Composite Triple Beat
dB
111
111
111
Cross Modulation
dB
104
104
104
Composite Second Order
dB
69
69
69
Station Delay Characteristics
Forward
(Chrominance to Luminance Delay)
Forward
(Chrominance to Luminance Delay)
Reverse
(Group Delay in 1.5 MHz BW)
Frequency (MHz)
Delay (nS)
Frequency (MHz)
Delay (nS)
55.25 - 58.83
20
5.0 - 6.5
46
61.25 - 64.83
10
6.5 - 8.0
25
67.25 - 70.83
5
8.0 - 9.5
13
37.5 - 39.0
11
39.0 - 40.5
15
40.5 - 42.0
25
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
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).