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
11
RF Section Specifications, continued
Notes for RF Section Specifications:
1.
Reference output tilt and internal tilt are both “Linear” tilt.
2.
Launch amplifier forward noise figure specified with interstage equalizer (ISEQ) installed to achieve reference tilt.
3.
Forward internal tilt specified with factory installed 0 dB ISEQ.
4.
Launch amplifier forward gain from RF input to station output port, with ISEQ installed to achieve reference tilt. Stated gain
applies for all forward segmentation configurations.
applies for all forward segmentation configurations.
5.
The forward reference output tilt specified is achieved via 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.
Reverse output reference level at the RF input to the optical transmitter (RF output of specified reverse plug-in module).
8.
Launch amplifier reverse insertion loss from station reverse input(s) to launch amplifier reverse output. Launch amplifier
module has passive loss only in the reverse path (no gain stage).
module has passive loss only in the reverse path (no gain stage).
9.
Station reverse insertion loss from station reverse input(s) to the RF input of the optical transmitter (RF output of the
specified reverse plug-in module).
specified reverse plug-in module).
10. Reverse noise figure at station input, with specified degree of reverse segmentation (appropriate reverse plug-in module
installed in optical interface board) and 0 dB reverse input pad in launch amplifier.
11. All reverse specifications are with reverse switch installed.
12. With jumper installed in launch amplifier RF signal director location(s).
13. Forward port-to-port isolation is specified as the isolation between any two ports that are configured to be on separate
12. With jumper installed in launch amplifier RF signal director location(s).
13. Forward port-to-port isolation is specified as the isolation between any two ports that are configured to be on separate
segmentation paths. This is the minimum loss that a forward signal measured at any output port will incur if measured at an
alternate (undriven) port.
alternate (undriven) port.
14. Reverse path-to-path isolation is specified as the isolation between any two reverse paths that are configured as separate
segmentation paths. This is the minimum loss that a reverse signal present at the input of any optical transmitter will incur if
measured at an alternate (undriven) transmitter input.
measured at an alternate (undriven) transmitter input.
15. “Digital” refers to 550 - 870 MHz loading with 53 QAM carriers at -6 dB relative to analog video carrier levels.
16. “Digital” refers to 750 - 870 MHz loading with 20 QAM carriers at -6 dB relative to analog video carrier levels.
17. “Digital” refers to 650 - 870 MHz loading with 37 QAM carriers at -6 dB relative to analog video carrier levels.
18. Insertion loss from optical receiver RF output to launch amplifier RF input, with specified forward plug-in module installed in
16. “Digital” refers to 750 - 870 MHz loading with 20 QAM carriers at -6 dB relative to analog video carrier levels.
17. “Digital” refers to 650 - 870 MHz loading with 37 QAM carriers at -6 dB relative to analog video carrier levels.
18. 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.
from optical receiver output to station output.
19. Model 6944 Node with bdr has minimum reverse return loss of 15 dB.