4-2
This is why it is best to transmit the sweep from the amplifier test
point and measure it in the headend. This ensures that the system is
properly aligned to carry signals in the reverse path.
4.1.3 Interfacing With Different Network Architectures
Single Cable - Split Band Network
The Model 3HRV is connected in the headend as shown in figure 1.
The connections are similar to those made for forward sweep, with
the monitor output connected to the combining network. This allows
the 3SRV to receive telemetry signal from the 3HRV.
Figure 1. Single Cable — Split Band Network Reverse Sweep
Configuration With Bi-Directional Test Points.
In the field, systems with bidirectional test points, (forward and
reverse signals both present on the same test point) a summing
network (provided with each reverse sweep option) is used to enable
reception of forward telemetry and sweep, as well as inject reverse
telemetry and sweep. This summing network simplifies the
connection of the field receiver to the test point.
Systems with directional test points are set up as shown in figure 2.
In this configuration two directional couplers are used to provide a
sample of the reverse sweep output to the input of the 3SRV re-
ceiver.
Summary of Contents for 3HRV
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