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Home > Products > Bell 202 Modems

DC Powered Bell 202 / 202T and V.23 Modems

Applied Systems Engineering SM series products are Bell 202 /202T and V.23 modems designed for operation over leased line communication circuits as commonly used in the electrical power and pipeline SCADA industries.

Rack mount Bell 202 Modem - photo
Rack Mount Bell 202 Modem
Bell 202 Modem - Stand Alone - photo
Bell 202 Modem - Box

These modems have been designed with many commonly requested features including 900Hz soft-carrier turnoff, LED indicators, digital control over most timing parameters (in 1 millisecond increments), transmit levels from 0 to -31db, and input power from 5 to 160 VDC. The primary modem circuitry is based on commercially available ICs with many years of field proven operation.

All Bell modems are available in a 19" rack configuration with a 16-slot custom backplane, or packaged in a metal box. For IED/RTU manufacturers, a low-cost "board only" version can mount directly in the Remote unit.

 

Power

  • Box modem: 5 to 160 VDC, draws less than 500 mw
  • Rack Modems: 120/240 VAC to power supply
  • "Hot Card Swap" on rack mount configuration (backplane supports dual power supplies)

Timing

  • Carrier detect on delay: 2 to 30 msec., 1 msec. increments
  • RTS/CTS delay: 0 to 254 msec., 2 msec. increments

Levels

  • Transmit Gain: 0 to –31 dB, 1dB increments
  • Receiver Gain: –35 or -45 dB

Isolation

  • 1,500 VAC Telco
  • 1,800 VAC Power Supply

LEDs

  • Transmit (TD) and receive (RD) data, RTS, CTS, carrier detect (CD), and power
  • Connections
  • Analog side via 4-wire RJ-11 (box modem) or terminal screws (rack mount modem)
  • Digital side via DB-25 RS-232

Other

  • 2-wire or 4-wire (2-wire with optional 156 msec. receiver squelch)
  • Constant or switched carrier
  • 900Hz carrier turnoff (Bell 202 modem only), 1 - 15 msec, 1 msec. increments

Packaging

  • 19” rack is 5 1⁄4” high with slots for 16 modems plus redundant power supplies
  • Metal enclosure is 187x105x36 mm (7.35x4.14x1.42”) and includes flanges with 4 mounting holes
  • “Board only” dimensions are 100x160mm (3.94x6.30”)

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For more information about the products and services Applied Systems Engineering provides, select from the main menu on the top or please feel free to contact us directly if you have any questions or would like to discuss your requirements with an application engineer.

You may contact us in Campbell, CA by phone at 408-364-0500, fax to 408-364-0550, or via email at products@ase-systems.com.

Normal business hours are 9:00AM to 6:00PM Pacific Time, M - F.

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Applied Systems Engineering, Inc.
1671 Dell Avenue, Suite 200
Campbell, California 95008
Phone: (408) 364-0500 • Fax: (408) 364-0550
Email: products@ase-systems.com

Copyright ©2003-2007 Applied Systems Engineering, Inc.
All rights reserved.

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If you would like additional information on any of the ASE products or would like to discuss your specific requirements with a sales engineer, you can call directly or fax/e-mail the information about your requirement and a sales engineer will contact you.

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