Cisco Model 6940 Four Port Optoelectronic Node 870 MHz with 55 70 MHz Split 数据表
Model 6940 Optoelectronic Node - 5-55/70-870 MHz
3
Optical Section Specifications
Optical Section
- Forward Receiver (RX) Module
- Forward Receiver (RX) Module
Units
Standard RX
High Gain RX
Notes
Wavelength
nm
1310 and 1550
1310 and 1550
Optical Input Range
dBm
-3 to +2.0
-3.0 to +1.0
Pass Band
MHz
52-870
52-870
Frequency Response
dB
± 0.75
± 0.75
1
Tilt (
±1.5 dB)
dB 0
0
Optical Input Test Point (
± 20 %)
V DC
1V / mW
1V / mW
2
RF Output Test Point (± 1.0 dB)
dB
- 20
- 20
RF Output Level
dBmV
See Chart Below
See Chart Below
3
Receiver RF Output Level Vs Transmitter OMI
Standard
Receiver
High
Gain
Receiver
19.5
20.0
20.5
21.0
21.5
22.0
22.5
23.0
23.5
24.0
24.5
25.0
25.5
26.0
2.
25%
2.
50%
2.
75%
3.
00%
3.
25%
3.
50%
3.
75%
4.
00%
Transmitter OMI per Channel
Minimum
RF Output
Level
3
(dBmV)
with
0 dBm
Optical
Input
Power
1310 nm
1550 nm
1550 nm
30.5
31.0
31.5
32.0
32.5
33.0
33.5
34.0
34.5
35.0
35.5
36.0
36.5
37.0
37.5
2.
25
%
2.
50
%
2.
75
%
3.
00
%
3.
25
%
3.
50
%
3.
75
%
4.
00
%
Transmitter OMI per Channel
Minimum
RF Output
Level
3
(dBmV)
with
0 dBm
Optical
Input Power
1310 nm
1550 nm
1550 nm
Notes for Optical Section Specifications:
1.
For forward receiver module only. Does not include frequency response contributions from forward optical transmitter.
2.
Referenced to optical input power in milliwatts at 1310 nm.
3.
Minimum receiver RF output level for the stated transmitter percent Optical Modulation Index (OMI) per channel, with receiver optical
input power of 0 dBm. To determine RF output levels at other optical input power, add (or subtract) 2 dB in RF level for each 1 dB
increase (or decrease) in receiver optical input power.
input power of 0 dBm. To determine RF output levels at other optical input power, add (or subtract) 2 dB in RF level for each 1 dB
increase (or decrease) in receiver optical input power.
For reverse optical transmitter and link performance, see the “Analog Reverse Optical Transmitters for Model
6940/6944 and GainMaker
®
Optoelectronic Stations” data sheet or the “Model 6940/44 bdr Digital Reverse” data
sheet(s).
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).