Cisco Model 6942 Four Port Optoelectronic Node 870 MHz with 55 70 MHz Split 数据表
Model 6942 Four Port Optoelectronic Node – 5-65/86-870 MHz
8
RF Section Specifications, continued
Launch Amplifier Performance - Reverse
Units
Reverse
Notes
Frequency Response
dB
+/- 0.5
4
Internal Tilt (+/- 1 dB)
dB
0
4
Insertion Loss
dB
- 3.0
1,4
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
na
Path to Path Isolation
dB
na
> 50
> 50
5
Insertion Loss
dB
-3
-3
-3
2,4
Noise Figure
dB
14.5
14.5
14.5
3,4
CENELEC Distortions
11
Discrete Third Order
dBuV
110
Discrete Second Order
dBuV
102
Station Delay Characteristics
Forward
(Chrominance to Luminance Delay)
Forward
(Chrominance to Luminance Delay)
Reverse
(Group Delay in 1.5 MHz BW)
(Group Delay in 1.5 MHz BW)
Frequency (MHz)
Delay (nS)
Frequency (MHz)
Delay (ns)
91.25 - 94.83
5
5.0 - 6.5
39
97.25 - 100.83
3
6.5 - 8.0
17
103.25 - 106.83
2
8.0 - 9.5
8
112.25 - 116.68
2 60.5
-
62.0
10
62.0
-
63.5
12
63.5
-
65.0
17
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
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).
Notes for this page:
1. Launch amplifier reverse insertion loss from station reverse input(s) to launch amplifier reverse output. Launch amplifier module
has passive loss only in the reverse path (no gain stage).
2. Station reverse insertion loss from station reverse input(s) to the RF input of the optical transmitter (RF output of the specified
reverse plug-in module).
3. Reverse noise figure at station input, with specified degree of reverse segmentation (appropriate reverse plug-in module installed
in optical interface board) and 0 dB reverse input pad in launch amplifier.
4. All reverse specifications are with reverse switch installed.
5. Reverse path-to-path isolation is specified as the isolation between any two reverse paths that are configured as separate
5. Reverse path-to-path isolation is specified as the isolation between any two reverse paths that are configured as separate
segmentation paths. This is the minimum loss that a reverse signal present at the input of any optical transmitter will incur if
measured at an alternate (undriven) transmitter input.
measured at an alternate (undriven) transmitter input.