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Scope

The work under this section includes the furnishing of all labor, materials, equipment and supervision for furnishing spread spectrum radio modems as indicated on the drawings and specifications.

Submittals

Submit shop drawings and product data for equipment furnished under this Section in accordance with the GENERAL CONDITIONS.

Furnish Operation and Maintenance Manuals in accordance with Section, OPERATION AND MAINTENANCE MANUALS.

Manufacturer

The radio modems shall be Spread Spectrum Frequency Hopping license-free wireless radio modems as supplied by the Data-Linc Group or pre-approved equal.

Unitary Responsibility

In order to unify responsibility for proper operation of the spread spectrum radio modems, it is the intent of these Specifications that all components shall be furnished by a single supplier (unitary source).

General

All radio modems, supplied under this contract must be FCC approved under article 15. Each radio modem shall be capable of store and forward data routing and support the application protocol communication.

All radio modems shall be license-free frequency hopping spread spectrum radio modems.

All radio modems shall operate in the 902-928MHz Spread Spectrum band.

All radio modems shall not require FCC site license. All radio modems shall have FCC equipment authorization as a FCC Part 15-Subclass C.

All radio modems shall have the capability to transmit 25 miles (40 km) rated range, 35 miles (56 km) installed range, with line of site using omni directional antenna, or further with the use of Repeaters.

All radio modems shall be factory configured or end user configured via personal computer using a terminal emulation software or Hyper Terminal without changing internal components. Opening the modem to change parameters is unacceptable.

All radio modems shall be configurable to operate as a Master, Remote, Repeater or Repeater/Remote, and shall be capable of forwarding data packets in a prescribed route to an end destination. Each Master station and its assigned Remote units shall operate on a unique transmit/receive frequency/code and on a non-interfering basis with other Master/Remote systems. Up to fifteen (15) separate radio systems shall operate simultaneously in the same location without interference.

All radio internal PC boards including the RF section, modem section and diagnostic sections must be enclosed in a single metal housing to eliminate interference with data/computer equipment. Radio modem housing shall be panel, or PLC rack mountable. (Optional NEMA 4x shall be available).

Communications Data Rate

All radio modems shall have a 10BaseT interface connection for data transmission with an optional 9 pin serial port for diagnostics

All radio modems shall transmit RF data at GFSK 144 Kbps or 188 Kbps.

All radio modems shall have an effective data throughput of up to 110 Kbps

All radio modems shall use 112 distinct channels in the 902 to 928 MHz band.

All modems shall have error checking utilizing a CRC 32 bit error checking.

All radio modems shall be capable of providing point-to-point, multi-point operation.

External antennas shall be capable of being mounted up to two hundred fifty (250') feet (76 meters) from radio modem.

Electrical

10 to 28 VDC; 12 VDC wall mounted transformer.

Power connection shall be via a latching screw terminal block with external ground connection.

Transmit power shall be 650 mA @ 12 VDC @ 1 watt.

Receive current shall be 100 mA @ 12 VDC.

Idle current shall be 65 mA @ 12 VDC.

Radio modems shall have the following indicators visible on the Outside surface: P-Power (red), RF Link (amber), RF In (green), RF Out (yellow), LAN Link (green), LAN In (yellow), LAN Out (yellow), LAN Collision (red), LAN OE (yellow).

Radio modem shall have output power of 1 watt maximum (10 field programmable steps from 1/10 watt to 1 watt) (+30 dbm).

Radio modem shall be capable of a response time of 5 to 15 ms turnaround delay between modems typical.

Receiver

Sensitivity shall be -110 dBm @ 10-4 raw BER;
-108 dBm @ 10-6 raw BER

Selectivity shall be 40 dB @ FC +/- 230 KHz;
60 db @ FC +/- 460KHz

System gain shall be 135 dB.

Operating Environment

Radio modems shall be rated for NEMA 1 environments.

Radio modems shall operate over a range of -40° to +167°F (-40° to +75°C).

Manufacturer

The Spread Spectrum Ethernet Radio Modem shall be SRM6210E as supplied by Data-Linc Group.