Installation
| Verify TTI installation location. |
| Verify that all power connections include a quick disconnect. |
| Verify installation of grounding and surge protection. |
| Verify power supply is properly sized and installed on DIN rail. |
| Verify output of power supply. |
Cabling
| Verify type of conduit used to run cables and proper termination techniques on each end. |
| Verify that conduits enter cabinets through bottom (preferred) or side (alternative) |
| Verify that all cable entrances are sealed and waterproof. |
| Verify that all drilled holes for installing cabling in mounting structures must be free of burrs and sharp edges. |
| Verify that all signal cables are continuous and unspliced. |
| Verify that each cable utilizes a unique color tape on each end that is resistant to fading due to UV exposure. |
Antenna
| Verify that antenna signal cables are terminated to the correct ports for EB and WB directions as well as GP and Express lanes. |
| Verify that reader is a CDOT-approved model and properly installed. |
| Verify that the coaxial cable connector on the cable is appropriate for the antenna without the use of adapters. |
| Verify antenna mounting height and orientation for intersecting with oncoming traffic at a 45-degree angle. |
| Verify that antenna is aimed at the center of the appropriate lane per CDOT requirements. |
| Verify that coaxial cable is sized appropriately for the run length and corresponding signal attenuation. |
| Test coaxial cable with RF tester and record results. Attenuation loss shall conform to CDOT’s dB requirements. |
| Verify that installation is reading the RFID protocols of different ExpressToll tags. |
| Verify that Python software is operational. |
Serial Configuration
Confirm serial configuration required by the manufacturer is being utilized: bitrate, data bits, parity, stop bits, and flow control.
Accuracy Testing
| Is the number of tag reads from Express lane(s) picked up by GP antennas > 0? If yes, re-aim antennas and test again. |
| Is the number of tag reads from GP lanes picked up by Express lane antennas > 0? If yes, re-aim antennas and test again. |
| Is the number of tag reads from Express lane within +/- 10% of the actual number of that pass through? |
| Is the number of tag reads from GP lane within +/- 10% of the actual number of that pass through? |