Cisco Model 6940 Four Port Optoelectronic Node 870 MHz 数据表
Model 6940 Collector/Terminator Node - 5-65/86-870 MHz
5
Optical Section Specifications
Optical Section - Forward Receiver Module
Units
6940 High Gain Receiver
Notes
Wavelength
nm
1310 and 1550
Optical Input Range
dBm
-3 to +1
Pass Band
MHz
52-870
Frequency Response
dB
± 0.75
1
Tilt (
±1.5 dB)
dB 0
Optical Input Test Point (
± 20 %)
V DC
1V / mW
2
RF Output Test Point (± 1.0 dB)
dB
- 20
RF Output Level @ -2 dBm Optical Input
dBmv
See Chart Below
3
Output Return Loss
dB
10
Receiver RF Output Level Vs Transmitter OMI
(using High Gain Receiver)
26.5
27.0
27.5
28.0
28.5
29.0
29.5
30.0
30.5
31.0
31.5
32.0
32.5
33.0
33.5
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
-2 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.
Typical receiver RF output level for the stated transmitter percent Optical Modulation Index (OMI) per channel, with receiver optical input
power of -2 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.
power of -2 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
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). 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 20
°C
(68
°F).