Cisco Model 6942 Four Port Optoelectronic Node 870 MHz with 55 70 MHz Split 数据表
Model 6942 Four Port Optoelectronic Node – 5-42/54-870 MHz
8
RF Section Specifications, continued
Launch Amplifier Performance - Reverse
Units
Reverse
Notes
Frequency Response
dB
+/- 0.5
5
Internal Tilt (+/- 1 dB)
dB
0
5
Insertion Loss
dB
- 3.0
2,5
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
6
Insertion Loss
dB
-3
-3
-3
3,5
Noise Figure
dB
14.5
14.5
14.5
4,5
Reference Output Levels @ 5 and 42 MHz
dBmV
14
14
14
1
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
16
5.0 - 6.5
46
61.25 - 64.83
8
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
Notes for this page:
1.
Reverse output reference level at the RF input to the optical transmitter (RF output of specified reverse plug-in module).
2.
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).
has passive loss only in the reverse path (no gain stage).
3.
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).
reverse plug-in module).
4.
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.
in optical interface board) and 0 dB reverse input pad in launch amplifier.
5.
All reverse specifications are with reverse switch installed.
6.
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.
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.