Cisco Model 6940 Coll Term 3-Port Unbal Opto Node 870 MHz w 65 86 MHz Split Scheda Tecnica
Description
The Model 6940 and Model 6944 Nodes utilize plug-in accessories that are common to all Model 6940 and
Model 6944 Nodes. They are typically field installed in accordance with system design. The accessories specified
in this document include:
Forward Equalizers (linear)
Forward equalizers produce a tilted frequency response opposite of that produced by coaxial cable. Standard
forward equalizers produce a tilted frequency response across the specified bandwidth with additional shaping to
counteract the effects of normal coaxial cable response.
Linear versions of forward equalizers provide a “flat” tilt across the specified bandwidth without any additional
shaping to counteract normal cable response. Linear forward equalizers are used in node applications where there
is no input coaxial cable before the first RF gain stage.
An equalizer’s “dB value” indicates the equivalent length of cable (in dB, at rated high frequency) that the equalizer
is designed to offset. The dB value and rated high frequency (750 or 870 MHz) are printed on the top of each
equalizer.
Inverse Equalizers (cable simulators)
Inverse equalizers produce cable equivalent tilt. An inverse equalizer is normally used in place of a forward input
equalizer during station balancing when an amplifier is short spaced, in order to achieve the desired output tilt. An
inverse equalizer’s “dB value” indicates the length of cable (in dB) that would produce similar tilt (loss differential
from low to high frequency). The 870 MHz inverse equalizer values are printed on the top of each inverse
equalizer.
Pads (attenuators)
Plug-in pads produce flat (even) loss across the forward and reverse frequency spectrums. Pads are used during
station balancing to adjust amplifier signal levels as needed. The (dB) loss produced is equal to the pad value
printed on the top of the pad.
Reverse Equalizers
Reverse equalizers produce a tilted frequency response opposite of that produced by coaxial cable. They are
normally used during station balancing to counteract the tilt produced by coaxial cable in order to achieve desired
tilt. An equalizer’s “dB value” indicates the equivalent length of cable (in dB, at rated high frequency) that the
equalizer is designed to offset. The dB value and rated high frequency (42, 55, or 65 MHz) are printed on the top
of each equalizer.
Model 6944 Nodes. They are typically field installed in accordance with system design. The accessories specified
in this document include:
Forward Equalizers (linear)
Forward equalizers produce a tilted frequency response opposite of that produced by coaxial cable. Standard
forward equalizers produce a tilted frequency response across the specified bandwidth with additional shaping to
counteract the effects of normal coaxial cable response.
Linear versions of forward equalizers provide a “flat” tilt across the specified bandwidth without any additional
shaping to counteract normal cable response. Linear forward equalizers are used in node applications where there
is no input coaxial cable before the first RF gain stage.
An equalizer’s “dB value” indicates the equivalent length of cable (in dB, at rated high frequency) that the equalizer
is designed to offset. The dB value and rated high frequency (750 or 870 MHz) are printed on the top of each
equalizer.
Inverse Equalizers (cable simulators)
Inverse equalizers produce cable equivalent tilt. An inverse equalizer is normally used in place of a forward input
equalizer during station balancing when an amplifier is short spaced, in order to achieve the desired output tilt. An
inverse equalizer’s “dB value” indicates the length of cable (in dB) that would produce similar tilt (loss differential
from low to high frequency). The 870 MHz inverse equalizer values are printed on the top of each inverse
equalizer.
Pads (attenuators)
Plug-in pads produce flat (even) loss across the forward and reverse frequency spectrums. Pads are used during
station balancing to adjust amplifier signal levels as needed. The (dB) loss produced is equal to the pad value
printed on the top of the pad.
Reverse Equalizers
Reverse equalizers produce a tilted frequency response opposite of that produced by coaxial cable. They are
normally used during station balancing to counteract the tilt produced by coaxial cable in order to achieve desired
tilt. An equalizer’s “dB value” indicates the equivalent length of cable (in dB, at rated high frequency) that the
equalizer is designed to offset. The dB value and rated high frequency (42, 55, or 65 MHz) are printed on the top
of each equalizer.
Optoelectronics
Model 6940/6944
Optoelectronic Node Accessories
Optoelectronic Node Accessories