Cisco Model 6944 Four Port Optoelectronic Node 870 MHz with 42 54 MHz Split 数据表
Model 6944 Four Port Optoelectronic Node – 5-55/70-870 MHz
8
Optical Section Specifications
Optical Section - Forward Receiver Module
Units
6944 Standard RX
Notes
Wavelength
nm
1310 and 1550
Optical Input Range
mW
dBm
0.5 to 1.6
-3 to + 2
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
Optical Input Power Threshold for Rx On/Off
(for Rx Redundancy)
(for Rx Redundancy)
dBm
-4 / -6
3
RF Output Level @
0
dBm Optical Input
dBmV
Refer to chart (below)
2
RF Output Test Point (± 1.0 dB)
dB
- 20
Receiver RF Output Level Vs Transmitter OMI
(using Standard 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
26.5
2.25%
2.50%
2.75%
3.00%
3.25%
3.50%
3.75%
4.00%
4.25%
Transmitter OMI per Channel
Minimum
RF Output
Level
2
(dBmV)
1310 nm
1550 nm
1550 nm
For reverse optical transmitter and link performance, see the “Analog Reverse Optical Transmitters for Model
6940/6944 and GainMaker
Optoelectronic Stations” data sheet, and the Model 6940/44 bdr 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
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.
Notes for Optical Section Specifications:
1. For forward receiver module only. Does not include frequency response contributions from forward optical transmitter.
2. Minimum receiver RF output level for the stated transmitter percent OMI/ch. (Optical Modulation Index per channel), with receiver optical
2. Minimum receiver RF output level for the stated transmitter percent OMI/ch. (Optical Modulation Index 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.
increase (or decrease) in receiver optical input power.
3. Redundant Control Module (RCM) or status monitoring transponder is required for Rx redundancy. Threshold stated is for RCM.
Threshold is adjustable via element management software if Transponder is used (TNCS or equivalent). Optical input power below the
“Off” threshold causes an RF switch from Primary Rx to Redundant Rx. Optical input power above the “On” threshold causes an RF
switch back to Primary Rx.
“Off” threshold causes an RF switch from Primary Rx to Redundant Rx. Optical input power above the “On” threshold causes an RF
switch back to Primary Rx.