CrosStar Modem Products

CrosStar Modem Products

CrosStar manufactures and distributes several modem support products. All these fine products are backed up by CrosStar's Limited Lifetime Warranty.

Modems

The MD-101 Bell 202 And MD-102 v.23 Modems are half-duplex Frequency-Shift-Keyed (FSK) audio tone modem that connects to SCADA equipment by an RS-232 Data Communications Equipment (DCE) 9-Pin Connector. The MD-101/MD-102 Modem operates from 0 to 1200 baud on private leased telephone lines, voice/audio radio links, or any dedicated two wire circuit. Both 2-Wire and 4-Wire 600 ohm telephone lines are supported along with most land mobile radios. The MD-101 & MD-102 are powered by 12 VDC to make operation during power failure simple. Click here for Details.

The MD-201 Bell 202 Modem With DF1 To HDLC Protocol Converter is a half-duplex Frequency-Shift-Keyed (FSK) audio tone modem with integral protocol converter. The MD-201 Modem operates at 1200 baud on private leased telephone lines, voice/audio radio links, or any dedicated two wire circuit. The MD-201 has dual isolated audio ports plus a radio Push-To-Talk (PTT) output, so it can operate both telephone and radio circuits simultaneously, providing active audio mixing to prevent impedance mismatching. Both two-wire and four-wire telephone circuits can be interfaced easily to the modem. A Modified HDLC protocol is used over the audio link which interfaces to several legacy telemetry systems. The MD-201 can operate as either the telemetry master or remote. Click here for Details.

Radio/Phone Line Interface

The BA-200 Audio Bridging Amplifier provides hybrid bridging of up to five dedicated telephone lines. Both 2-Wire and 4-Wire 600 ohm telephone lines are supported, with individual transmit and receive adjustments per line. The audio and microphone connections of most land mobile radios can also be bridged with telephone lines with the BA-200. The BA-200 is powered by 12 VDC to make operation during power failure simple. Click here for Details.

The LPU-101 Line Protection Unit provides isolation and surge protection for equipment connected to 600 ohm dedicated telephone lines. Click here for Details.

Telemetry Data Radios

The Maxon VHF/UHF Data Module Radio is a compact audio telemetry data radio transceiver for the 136-174 MHz VHF band and 400-470 MHz UHF band. The SD-125 is designed to transmit and receive half-duplex 0 to 1200 bits per second FSK Modem tones over 30, 25, 15, or 12.5 KHz spaced FM telemetry channels. CrosStar supplies the data radios preprogrammed with the telemetry frequencies licensable to Utility Services. The SD-125 is powered by 9 - 18 VDC and requires less than 60 MilliAmps of current during receive. Click here for Details.