Motorola BLE100 Ingress Control Switch, Options and Accessories, Model Description Function, Adu

2-8Overview

The input and output of the return path each include a JXP-*B pad facility. You can also use either pad socket as a test point or a signal injection point. The return output pad value is normally selected to control the return signal level into the next upstream amplifier. Select an appropriate return input pad to attenuate excessive input signal.

The return-input test point and the return-output test point are −20 dB directional couplers. Both test points present 75-ohm source impedance and do not require special test probes.

Ingress Control Switch

The ingress control switch (ICS) provides return-path signal attenuation or cutoff in the BLE100. This is accomplished through the frequency agile LIFELINE® status-monitoring module, which you can purchase directly from AM Networks. (Figure 2-8 illustrates the location of the optional ICS).

The ICS provides a means of isolating sources of ingress from a centralized location. Using a downstream command through the LIFELINE status-monitoring system, you can attenuate the return path through the line extender by 6 dB or by 38 dB. By reducing the ingress level at the headend or monitoring point, you can further isolate the ingress source.

After an ingress source is isolated to the last possible amplifier, node, or line extender, you can shut the return path off at that location. This limits the impact of the ingress on the remainder of the network while eliminating the source of ingress.

Options and Accessories

The factory ships the BLE100 as a fully functional unit, but you must configure it appropriately for the field-location requirements. You must install the correct forward equalizer or broadband cable simulator and input pad to place the unit into service. Section 3, “Amplifier Setup” provides information to assist you in this task. Use model JXP-*B pads to control field signal levels. To compensate for temperature, install the automatic drive unit (ADU) or QAM automatic drive unit (QADU) before placing the BLE100 in service. You can install other items, such as return thermal attenuators or ingress control switches at your discretion, but these options do not render the BLE100 inoperative if they are not included.

Table 2-1 provides a comprehensive list of options and accessories for the BLE100. See Section 3, “Amplifier Setup,” or the Motorola online product catalog for additional information.

Table 2-1

BLE100 options and accessories

Model	Description	Function
QADU-*	QAM Automatic Drive Unit	This board automatically controls amplifier output levels
		that change with cable attenuation and hybrid output.
		The selection of an appropriate pilot frequency is
		required.
ADU-*	Automatic Drive Unit	This board automatically controls amplifier output levels
		that change with cable attenuation and hybrid output.
		The selection of an appropriate pilot frequency is
		required.

BLE100 Installation and Operation Manual