Cisco Dual Tier Addressable Stretch Tap Installation Guide
Optional Modules
590212 Rev G
5
Optional Modules
The tap accepts several types of modules that define specific tap functions.
Directional Coupler
The plug-in directional coupler (DC) module sets the tap value. The orientation of
the DC determines the RF flow through the tap. The DC is a plug-in module that is
installed in the field. Refer to Installing Optional Modules (on page 23) for more
information.
the DC determines the RF flow through the tap. The DC is a plug-in module that is
installed in the field. Refer to Installing Optional Modules (on page 23) for more
information.
Directional Coupler/Equalizer (DC/EQ)
The DC/EQ functions like a DC, but includes a fixed equalizer on its tap port. The
DC/EQ can equalize the tap port from 5 MHz to 870 MHz in steps from 3 dB to 18
dB. The signal down the line is not affected. The DC/EQ is a plug-in module that
can be installed in the field. Refer to Installing Optional Modules (on page 23) for
more information.
DC/EQ can equalize the tap port from 5 MHz to 870 MHz in steps from 3 dB to 18
dB. The signal down the line is not affected. The DC/EQ is a plug-in module that
can be installed in the field. Refer to Installing Optional Modules (on page 23) for
more information.
Positive Temperature Coefficient Resistor (PTC)
A positive temperature coefficient resistor (PTC) is required for each drop that
requires power. During over-current conditions, the PTC goes "open circuit" (high
resistance). When the problem is cleared, removing or replacing the drop connection
returns the PTC to normal operation.
requires power. During over-current conditions, the PTC goes "open circuit" (high
resistance). When the problem is cleared, removing or replacing the drop connection
returns the PTC to normal operation.
The PTC is a plug-in module that can be installed in the field. Refer to Enabling Drop
Powering (on page 30) for information on installing power-passing on each drop.
Powering (on page 30) for information on installing power-passing on each drop.
The following illustration shows a PTC assembly.