Cisco Model 6944 Four Port Optoelectronic Node 870 MHz with 42 54 MHz Split 数据表
Model 6944 Four Port Optoelectronic Node – 5-42/54-870 MHz
9
RF Section Specifications
General Station Performance
Units
Forward
Reverse
Notes
Pass Band
MHz
54-870
5-42
Return Loss
dB
16
16
19
Fwd Port to Port Isolation 54 – 550 MHz
(with jumper) 551 – 870 MHz
(with jumper) 551 – 870 MHz
dB 60
50
see Reverse Station
Performance
12,13
Fwd Port to Port Isolation 54 – 550 MHz
(with splitter) 551 – 870 MHz
(with splitter) 551 – 870 MHz
dB 60
40
see Reverse Station
Performance
13
Hum Modulation @ 12 A
dB
70 (54-750 MHz)
60 (5-10 MHz)
dB
65 (751-870 MHz)
65 (11-42 MHz)
Hum Modulation @ 15 A
dB
65 (54-750 MHz)
60 (5-10 MHz)
dB
60 (751-870 MHz)
65 (11-42 MHz)
Internal RF Test Points (±1.0 dB)
dB
-20
-20
External RF Test Points (±1.5 dB)
dB
-30
-30
Launch Amplifier Performance - Forward
Units
Forward
Notes
Amplifier Type
--
PHD
Operational Gain (minimum)
dB
26
4,12
Frequency Response
dB
±0.5
12
Internal Tilt (±1 dB)
dB
+10
1,3
Noise Figure @… 870 MHz
750 MHz
650 MHz
550 MHz
55 MHz
750 MHz
650 MHz
550 MHz
55 MHz
dB 9.5
10
11
11
12.5
19
2
Reference Output Levels @… 870 MHz
750 MHz
650 MHz
550 MHz
55 MHz
750 MHz
650 MHz
550 MHz
55 MHz
dBmV 47.5
45.7
44
42.5
35
Reference Output Tilt (55-870 MHz)
dB
12.5
1,5
78 NTSC channels (CW) with digital
15
Composite Triple Beat
dB
74
6
Cross Modulation
dB
71
6
Composite Second Order (high side)
dB
71
6
94 NTSC channels (CW) with digital
16
Composite Triple Beat
dB
69
6
Cross Modulation
dB
66
6
Composite Second Order (high side)
dB
68
6
110 NTSC channels (CW) with digital
17
Composite Triple Beat
dB
65
6
Cross Modulation
dB
62
6
Composite Second Order (high side)
dB
65
6
Forward Insertion Loss
Optical Interface Board and Plug-Ins
Optical Interface Board and Plug-Ins
(Loss from specified optical receiver RF output to
launch amplifier RF input)
launch amplifier RF input)
Units
with
no Module
Installed
with
Redundancy
Module
Installed
with
Narrowcast
Module
Installed
Notes
Receiver position 1
dB
-1.0
-1.5
-2.5
18
Receiver position 2
dB
0
-1.5
-2.5
18
Receiver position 3 and 4
dB 0 -0.5 -12.0
18
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).