900 MHz Spread Spectrum Wireless Radios For Traffic Control Systems

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The new T-Series Family includes two models, the 900 MHz T-9 and the 2.4 GHz T-24. Both models employ FreeWave's proprietary frequency hopping technology to provide secure, reliable, error-free communications at line-of-sight ranges of up to 60 miles. Both models are designed to install into and draw power from a single slot in a standard loop detector card rack for convenient use with 170. 2070 or NEMA controllers. Both models are compatible with all leading brands of traffic signal controllers.

The T-Series models are fully compatible with FreeWave's standard 900 MHz or 2.4 GHz products and offer the same extensive set of features including user-programmable RS-232, RS-485, or RS-422 interface, 6 to 30 volt DC operation, 100% tested -40 °C - +75 °C operation, and 115.2 Kbps true network bandwidth. Like all FreeWave products, the T-Series models can be programmed to function as a master, slave, single-radio repeater, or single-radio slave/repeater. The number of radios that can be installed in a network is unlimited, and the number of repeaters that can be used in any network path is also unlimited.

The T-Series models are compatible with FreeWave CommControl network management software and are provided with a two-year warranty. Other support available from FreeWave for the T-Series models includes fixed-cost out of warranty repair, network design services, technical support, installation support, and training.

Particular features of these radios:

Traffic Control Systems
RS232 / RS422 or RS485 data (software selectable)
SMA connector available
Detector Rack Compatible-plugs into and is powered from standard loop detector rack
Backward compatible - 100% compatible with all existing 900 MHz FreeWave radios.
Versatile - A single radio can operate simultaneously as a Slave and as a Repeater.
High Noise Immunity - Superior Performance in noise congested environments.
Secure - Proprietary spread spectrum technology prevents detection and unauthorized access.
High Speed - 115.2 Kbps continuous throughput.
Long Range - 60+ mile line of sight range.
Error Free Communications - 32 bit CRC with automatic retransmission.
Industrial Grade Specifications - 100% tested for full performance from -40 °C - +75 °C.

Specifications:

Radio link:

Frequency Range

902-928 MHz

2.4-2.4835 GHz

Method

Frequency hopping spread spectrum

Hopping Patterns

15 per band, 105 total, user selectable

Hopping Channels

50 to 112, user selectable

50 to 80, user selectable

Hopping bands

7, user selectable

6, user selectable

Range, Line-of-sight

60 miles

20 miles

Occupied Bandwidth

230 KHz

Modulation

GFSK, 120 ~ 170 Kbps

RF Connector

Type SMA

System Gain

141 dB exclusive of antennas

135 dB exclusive of antennas

Transmitter:

Output Power

100 mW to 1 Watt (+30 dBm)

100 mW to 500 mW

Receiver:

Sensitivity

-108 dBm for 10^-6 BER
-110 dBm for 10^-4 BER

-108 dBm for 10^-6 BER

Selectivity

20 dB at fc ±± 230 KHz
60 dB at fc ± 290 KHz

Data Transmission:

Error Detection

32 bit CRC, retransmit on error

Data Encryption

Substitution, dynamic key

Link Throughput**

115.2 Kbps

** Uncompressed , measured assuming 75% frequency availability

Data Interface:

Protocol

Either RS-232/RS-422/RS485,
115.2 KBaud, DCE

Connector

RS-232 DB9 (DCE)

Power Requirements:

Voltage

6 to 30 Vdc

Current [mA]

	6 Vdc	12 Vdc	30 Vdc
Transmit	1000	500	200
Receive	152	86	43
Idle	40	21	12
Sleep	8	6	3

	6 Vdc	12 Vdc	30 Vdc
Transmit	1000	500	200
Receive	152	86	43
Idle	40	21	12
Sleep	8	6	3

Environment and mechanical:

Operating tempertature

-40 °C - +75 °C

Dimensions
(single board)

1 slot width standard loop detector rack

Weight

206 g

Ordering Info:

Model	Interface	RF Connector
T9	RS232, RS485, RS422	SMA
T24	RS232, RS485, RS422	SMA