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IRX1 Ingress Monitoring / Headend-based Receiver

Detects, measures, and localizes the return path test signals transmitted by the ITX2 on a continuous basis across the entire network

vendor P/N: IRX1

Effigis DRV3 Dual-band Portable Leakage Detector

The CPAT IRX1 is the fixed component of the CPAT FLEX Ingress Monitoring System. Installed at the headend/hub location, the IRX1 detects the return path test signals transmitted by the ITX2 transmitter across the entire network. By analyzing these signals, the IRX1 identifies the origin of capture points on the network and then sends all relevant information to the CPAT Web application that will, in post-processing, precise the geographical location of capture points.

IRX1 Features

• Very cost-effective receiver operating on a fixed upstream frequency
• Designed to detect ingress under severe upstream noise conditions
• Determines ingress location with a precision of ± 2.5 meters
• Tracks multiple vehicles equipped with an ITX2 transmitter
• RF return ports are continuously monitored for ITX2 test carrier detection
• No user intervention required to operate

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Monitoring capacity

The IRX1 (US Patent Pending: 13/187545 – CAN Patent Pending: 2,746,924) has a CPU that controls 4 distinct ingress monitoring module blocks running in parallel. Each block is equipped with 8 RF monitoring input ports, totaling 32 RF ports per IRX1. Return node combining on the IRX1 input ports could also be accommodated, depending on the upstream RF level available at the HE/Hub location.

The CPAT FLEX monitoring system (US Patent: 7,360,124 – CAN Patent: 2,535,269) is designed to monitor today’s amount of return nodes and then expand using additional IRX1 receivers.

Its low profile chassis form factor, high density port number and node combining capability facilitate future expansion.

General operation

As vehicles equipped with an ITX2 transmitter are driven through the plant, the ITX2 continuously transmits a low power digital ingress test signal in the 5-42 MHz band. The ingress test signal is specifically generated and configured to avoid any interference with the operator’s return band signals, such as DOCSIS carriers. When a vehicle is driven into an ingress prone area, the transmitted signal enters the coaxial plant and travels up to the HE/Hub location for detection by the IRX1 ingress receiver.

As soon as the digital test signal pilot is detected at the input of the IRX1, its data is decoded. The vehicle ID, event time stamp and RF level are then recorded. The IRX1 stores and communicates upstream decoded data back to the CPAT server, through the 10/100 BaseT Ethernet connection. With the IRX1’s high capacity processing power, there is no limit to the number of vehicles that can be equipped with an ITX2 transmitter module.


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Repair cycle

Once an ingress impairment is detected by the CPAT Flex Continuous Monitoring System and stored in the CPAT database, the technician uses the portable ITX2 and a web browsing enabled cell phone to precisely and rapidly find-and-fix the source of the ingress impairment.

CPAT Mobile Application Suite

Real-time ingress monitoring (RIM) is available on a mobile application for Apple iOS and Android. The RIM will assist you in locating ingress points within a few feet. Works in conjunction with the ITX2 and the portable hand held monopole antenna. Single Tech Ingress detection tool. The app will display drop down list of ITX2 to choose from, obtain real-time ingress level readings from IRX1, record events.

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