RAD STM-2 2-Channel Miniature Statistical Multiplexer

Call us for Pre-sales and discount pricing

  301-924-7400 Support

RAD STM-2 2-Channel Miniature Statistical Multiplexer  


The STM-2 is a miniature statistical multiplexer, multiplexing two asynchronous channels onto a single synchronous composite link, at data rates up to 19.2 kbps. Error-free, end-to-end performance is provided by powerful error detection and automatic retransmission.

Composite link interface is V.24/RS-232.

Any channel can be used as a command port to configure the entire system or to perform diagnostic tests.

Password secured access ensures high security, preventing unauthorized alteration of the system configuration.

The STM-2 features permanent storage of the system configuration, using non-volatile memory.
Downline loading of the configuration parameters from the local to the remote STM-2, or vice versa, is performed by software command.

The STM-2 features independent hardware and software flow control for each channel. End-to-end flow control can be exercised from DTE to DTE or from the STM-2 channel to the remote DTE. Several characters for X-ON and X-OFF are provided, enabling compatibility with most applications.

Comprehensive diagnostic capabilities provide local and remote loopbacks on the channels or on the composite link. The STM-2 can control pins 18 and 21 on the composite link, for sending loopback commands to the modem connected to the link. This enables complete system diagnostics, including testing of modems between STM-2s.

The STM-2 is available in a miniature enclosure. Sub-channel connections are made via two RJ-45 connectors.

The STM-2 is powered via an external, stand-alone power supply (5 VDC, 700 mA, regulated).


  • Multiplexes 2 asynchronous channels at data rates up to 19.2 kbps, onto a single synchronous link
  • Composite link data rate up to 19.2 kbps
  • Independent hardware and software flow control on each sub-channel
  • Control signal passed end-to-end, bi-directional
  • Menu driven command facility from any channel for configuration and diagnostics
  • Password secured access for system configuration
  • Permanent storage of system configuration
  • Downline loading of system parameters
  • Comprehensive diagnostics
  • Compact, easy to install

Miniature 2-Channel Statistcal Multiplexer

* Specify external power supply:
(power supply is provided with the unit)
230 for 230 VAC power supply
115 for 115 VAC power supply

Note: The power supply can be ordered separately, as follows:

for stand-alone regulated 230 VAC to 5 VDC/ 700mA power supply

for stand-alone regulated 115 VAC to 5 VDC/ 700mA power supply




RAD Products

For discount pricing on RAD Data Communications
email us at sales@data-connect.com
or call 301-924-7400