UDS 202T - 202S/T - 202S/D
Telenetics MOT202T Modem

The UDS Motorola 202T 202S/T 202S/D modems are not made anymore
but we carry them as a used/refub
the Telenetics MOT202T modem - FSK and V23 modulation with
-40 to +85°C temperature range and  VDC and 220VAC 50Hz power

The 202S Modem is the dial up and 202T Modems are lease line
and the 202S/T does both

we still offer these older designed modems and
also offer a newer updated design

Please review the Industrial Grade Bell 202T and V.23 Modem

(UDS 202T)
Telenetics MOT202T Modem
AC - DC power 202 modem

    Telenetics introduces the latest addition to the family of industrial grade, temperature hardened Telenetics MOT202T Modems,  . This 0-1800 bps leased telecom line or private wire 202 modem is a pin-for-pin, form, fit and function replacement for the Motorola/UDS Model RM16M202T modem.  Telenetics recently signed a manufacturing license  with Motorola and we are now delivering this new product line. Telenetics had to change some of the older chips for newer analog filters which gives new life to a world class modem. With these new changes we can offer an even a better unit - now with wider voltage and  temperature range.

 Features such as built-in diagnostic, anti-streaming, multi-power inputs (115 to 240AC, 12 to 125VDC) and heat/cold rated operating range capabilities make this modem a must for industrial applications.

Telenetics has designed modems that work in "remote" remote sites with very low failure rates. These devices work where other modems roll over and die. When a service call to a remote site can mean an all day trip these modems are the ideal solution. 

To service the growing need for efficient, reliable data communications in the harsh environments of "remote" remote sites and industrial facilities. Telenetics has developed a family of data communications products that can operate from various AC & DC power supplies and survive high surge levels and extreme heat and cold. All this without compromising the performance expected from state-of-the-art communications devices.

The Telenetics MOT202T modems are a direct replacement for the very popular 30-year-old (a de facto 202 modem standard) design that Motorola acquired through the purchase of Universal Data Systems 
  • Stand Alone MOT202T modem TEL62025197

  • Rack Card RM16M-MOT202T modem TEL62025209

  • DC Powered MOT202TDC modem TEL62025266

jump to Manual for the MOT202T version
jump to
Manual for the older UDS 202T version
jump to
Specifications PDF page


Specific Features for the 202 Modem

Interface Compatibility

The modem’s line interface is compatible with the Bell Systems/WE 202 specifications and with the ITU V.23 recommendation.

The modem’s data interface is compatible with the RS 232C specifications and with the ITU V.24/28 recommendations.

The Telenetics MOT202T modem is a Frequency Shift Keyed (FSK) modem which is designed for asynchronous operation at 0 to 1800 bps with good line conditioning, or 0 to 1200 bps asynchronous operation on unconditioned lines. The modem provides half duplex communications on 2 wire private lines or full duplex communications on 4 wire private lines, and is ideal for use in multipoint networks.

The 202 modem is a single printed circuit card enclosed in a new compact size housing. The unit features an integral anti-streaming protection option which prevents network Tie-ups by incorporating a delay timer that will disconnect a modem, if it remains in transmit mode longer than a selectable period of time. The 202 modem also features strap options for Request to-Send/Clear to Send Delay timing, Transmit Carrier, local Copy Squelch, Turnaround squelch, Soft Carrier Turn Off, Carrier Detect Level, Carrier Detect Delay, and Test Generator Baud Rate Select. These strap options allow the user greater control of the modem, for his individual application.  

The Telenetics MOT 202T  modem features built-in diagnostic and anti-streaming capabilities. The anti-streaming capability prevents a modem from remaining in the transmit mode when the modem is not actively transmitting data. The diagnostic features allow the user to verify transmitted and received data. 

 The  modem is designed to be interchangeable between the Universal Data Shelf multiple modem enclosure (RM16M series) and the stand alone modem enclosure. By removing the modem card and attaching the optional front panel, the modem can be directly inserted into the Universal Data Shelf. With this feature, a data-communications facility can be easily upgrade front multiple standalone enclosures to a centralized rack without the expense and trouble of purchasing new modems. Telenetics had to change some of the older chips for newer analog filters which gives new life to a world class modem. With these new changes we can offer an even a better unit - now with wider voltage choices and a temperature range.


Data Rate: 0 up-to 1,800bps asynchronous 

Operation: Full duplex over 4 wire private lines or half  duplex over 2-wire private lines

Modulation: Phase coherent, frequency shift keyed (FSK) and V23

Carrier Frequencies: Mark: 1200 Hz Space: 2200 Hz

Line Impedance: 600 ohms 10% transformer coupled and transient protected

Transmitter Output Level: Selectable from 0, to -12 dbm in 2 dbm steps

Clear to Send Delay: 8.3 ms, 33.2 ms, 59.9 ms, or 219.6 ms (selectable)

Carrier Detect Delay: 6 ms or 23 ms

Digital Interface: EIA RS-232 (DB-25 female) and CCITT V.24

Teleco Interface: RJ45 female

Turnaround Squelch: 0 ms, 8.3 ms, or 159.6 ms

Antistreaming: 4, 7.6, 14, 28, 56, none (selectable)

Soft Carrier Turnoff: 0 ms, 8.3 ms, or 26.6 ms

Environmental: -40 to +85° C; 95% humidity, noncondensing          

Mechanical: Width: 7"; Height 2.25"; Depth: 9.60"; Weight  3.0 Lbs.

AC Power Requirement:115 VAC and optional 
220/240VAC 50hz, @ 10 watts max

DC Power Requirements: 12 to 60 VDC, optional 125 VDC


Test Operate Switch

DL (Digital Loopback); When the switch is in the ST position, the received data is looped back into the transmitter and the data is transmitted to the remote end. The modem must be in the 4 wire mode.

TTP (Transmit Test Pattern): When the switch is in the TTP position, the transmitter is forced ON and transmits the date from the dot pattern generator to the COMM Line. The RS-232 interface lines to the transmitter are not active (RS, CS, TD).

DATA: The switch must be in the DATA position for all normal data transmission Indicators

RS (Request to Send): is illuminated when the RS line is high (ON)

CS (Clear to Send): ON when the CS line is high (ON)

CD (Carrier Detect): ON when a carrier is detected by the modem receiver.

RD (Receive Data): On when data is received, decoded, and furnished to the terminal equipment. RD is also ON when the receive cats line goes into a space condition, OFF in a mark condition.

TD (Transmit Data): Responds in the same manner as the RD LED, but only when data to be "transmitted" is furnished to the modem. However, the LED may be on when the DTE is disconnected.

TM (Test mode): Active when Test switch is in any test mode. The indicate' will blink OFF/ON when errors occur in Self Test mode

POWER: ON when power is applied



  • Stand Alone MOT202T modem 62025197

  • Rack Card MOT202T modem 62025209

  • DC Powered MOT202T modem 62025266

jump to Manual
jump to Specifications PDF page

You  may also want to consider pre-owned communications gear!
We also have new and used 202 202S, 202S/T 202S/D modems

Related pages


301-924-7400 EXT 25

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