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5-2

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.

5.1.3 Interfacing With Different Network Architectures

Single Cable - Split Band Network

The Model 3ST Sweep Transmitter is connected in the headend as

shown in figure 1. The connections are similar to those made for

forward sweep, with the transmitter output connected to the combin-

ing network. The difference is on the input to the 3ST transmitter.

The system signals along with the transmitted signals are tapped off

and coupled together with the reverse signals using a splitter. This

enables the 3ST transmitter to receive both forward and reverse

telemetry and sweep signals.

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.

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Wavetek 3ST Specifiche Pagina 85