User's Manual
Table Of Contents
- Health Limits
- Contents
- Before You Begin
- Developing the Installation Site Plan
- Installing and Configuring the MPI 6000
- Lane Tuning Guidelines
- Optimizing MPI 6000 Reader System Performance
- General Software Information
- Configuration Commands and Responses
- Configuring the MPI 6000
- Required Commands to Set Up MPI 6000 Reader
- System Interface Command Group Commands
- System Identify
- Set Communications Baud Rate
- Get Communications Baud Rate
- Set Time and Date
- Get Time and Date
- Firmware Download
- Reset Reader
- Get Stored Tag Response Message
- Get Number of Stored Tag Response Messages
- Delete All Stored Tag Response Messages
- Get System Startup Status
- Get Lane Controller Interface Status
- Get System Interface Status
- Get DigBrd Hdwr Remote Inventory
- Get DigBrd CPU Boot Fmwr Remote Inventory
- Get DigBrd CPU Appl Fmwr Remote Inventory
- Get DigBrd FPGA UDP/IP Core Fmwr Remote Inventory
- Get UDP/IP Core Lane Controller Parameters
- Set UDP/IP Core IP Address
- Get UDP/IP Core IP Address
- Get UDP/IP Core Port Number
- Configuring the MPI 6000
- Tag Command Processing
- System Diagnostics and Preventive Maintenance
- Acronyms and Glossary
- Block Diagrams
- System Technical Specifications
- Hardware Interfaces
MPI 6000 Multi-Protocol Reader System Guide
5-4
Identifying Cross-Lane Interference
Cross-lane interference is identified by an area in the RF read zone, or footprint,
which has areas where a tag cannot be read. If a toll lane has been operating satisfacto
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rily and then begins to show a degradation in system performance, that is, an increas-
ing number of missed reads or a spotty read pattern, there is a probability that cross-
lane interference is occurring.
Cross-lane interference can be caused by the following:
• A downlink antenna transmitting strong RF beyond its lane boundaries
• Reflection of RF from fixed objects (e.g., toll plazas with low, metal roofs)
• Reflection of RF from moving objects (e.g., a passing tractor-trailer in an adjacent
lane)
A typical toll lane application encompasses more than a single lane. In some cases a
toll plaza can have more than eight lanes with each lane having separate RF transmit
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ting (downlink) and receiving (uplink) antennas. As shown in Figure 5-1, the RF
transmitted within a lane is not bound by physical dividers such as lane barriers. With
multiple-lane applications, transmissions out of a lane can create areas of possible
cross-lane interference.
Figure 5-1 RF Footprint Extends Beyond Lane Boundaries