Cisco Model 6942 Four Port Optoelectronic Node 870 MHz with 65 86 MHz Split Datenbogen
Model 6942 Four Port Optoelectronic Node – 5-42/54-870 MHz
7
RF Section Specifications, continued
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
10
Receiver position 2
dB
0
-1.5
-2.5
10
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
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
°F
(20
°C).
Notes for RF Section Specifications:
1.
Reference output tilt and internal tilt are both “Linear” tilt.
2.
Launch amplifier forward noise figure with 1 dB input pad and 0 dB interstage equalizer (ISEQ).
3.
Forward internal tilt specified with factory installed 0 dB ISEQ.
4.
Launch amplifier forward gain from RF input to station output port, with 1 dB input pad and 0 dB ISEQ. The 1 dB input pad
simulates the loss of an ISEQ with value greater than 0 dB, which is typically field installed to achieve desired output tilt.
simulates the loss of an ISEQ with value greater than 0 dB, which is typically field installed to achieve desired output tilt.
5.
The forward reference output tilt specified is achieved via the field installation of appropriate ISEQ, in conjunction with the
internal tilt of the launch amplifier and the tilt associated with the optical link (transmitter/receiver combination).
internal tilt of the launch amplifier and the tilt associated with the optical link (transmitter/receiver combination).
6.
Station performance can be determined by combining optic performance and launch amplifier performance. Stated distortion
performance is for launch amplifier section operated at reference output levels and tilt.
performance is for launch amplifier section operated at reference output levels and tilt.
7.
“Digital” refers to 550-870 MHz loading with 52 QAM carriers at –6 dB relative to analog video carrier levels.
8.
“Digital” refers to 650-870 MHz loading with 35 QAM carriers at –6 dB relative to analog video carrier levels.
9.
“Digital” refers to 750-870 MHz loading with 19 QAM carriers at –6 dB relative to analog video carrier levels.
10. Insertion loss from optical receiver RF output to launch amplifier RF input, with specified forward plug-in module installed in the
optical interface board. Subtract this loss from the launch amplifier operational gain to determine forward station gain from
optical receiver output to station output.
optical receiver output to station output.