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RAD ASM-31 2-Wire Multirate Short Range Modem 

ASM-31

Call us for Pre-sales and discount pricing


  301-924-7400 Support

ASM-24 Sync Shorthaul Modem

RAD ASM-31 2-Wire Multirate Short Range Modem 

Features
  • The ASM-31, all-rate, sync/async short range modem, operates full duplex over 2-wire twisted pair, at selectable data rates from 1.2 kbps up to 128 kbps.
  • ASM-31 operates using 2B1Q line coding, and provides an operating range of up to 5.5 km (3.4 miles), independent of the data rate. An adaptive equalizer provides noise immunity and high performance over low quality lines.
  • Full duplex operation is achieved using the echo cancellation technique. This method entails setting one modem to be Master clock and the other to be Slave clock.
  • ASM-31 features diagnostic capabilities including implementation of local and remote loopbacks. The operator at either end of the line may test both modems and the line in a number of loopback modes. The loopbacks are controlled by either a manual switch or from the DTE interface.
  • The modem also includes a BER tester for complete end-to-end integrity testing. An error LED indicates each bit error detected.
  • Front panel LEDs provide indication for TD, RD, RTS and DCD, as well as Power, Local and Remote Test and Sync Loss.
  • Interface options include V.24/RS-232, V.35, RS-530, X.21, G.703 Codirectional, and Ethernet (see Ordering). The analog line connection is provided via an RJ-45 or a 3-port terminal block. Configuration is via internal jumpers and straps.
  • Line interface circuitry protects against lightning and power surges.
  • ASM-31 is available as a standalone unit or as a card for mounting in the ASM-MN-214, 19" rack. The rack can carry up to 14 cards.

Specifications

  • 2-wire, all-rate short range modem
  • Single sync/async channel
  • Full duplex operation using echo cancellation
  • Selectable data rates:
    Sync: 1.2 kbps to 128 kbps Async: up to 38.4 kbps
  • 2B1Q line coding
  • Operating range up to 5.5 km (3.4 miles), independent of data rate
  • Diagnostics include internal BERT, local and remote test
  • DTE interfaces:
    V.24/RS-232, V.35, RS-530, X.21, G.703 Codirectional, and IR-ETH
     

ASM-31/#/*/
2-wire, standalone modem

ASM-31/R/*/
2-wire modem card for
ASM-MN-214, 19" rack

# Specify power supply:
115 for 115 VAC supply
230 for 230 VAC supply
48 for -48 VDC supply
24 for 24 VDC supply
* Specify interface:
V24 for V.24/RS-232 interface
V35 for V.35 interface
X21 for X.21 interface
530 for RS-530 interface
G.703 for G.703 Codirectional
UTP for built-in Ethernet/802.3 bridge with RJ-45 connector
BNC for built-in Ethernet/802.3 bridge with BNC connector

Note: When using V.35 or X.21 interface for ASM-31/R, the CIA adapter is required.

CIA/&
Connector Interface Adapter for the
ASM-MN-214 19" rack

& Specify connector:
V35/1 for adapting one modem card's 25-pin connector into one V.35, 34-pin connector
X21 for adapting two adjacent modem cards' 25-pin connectors to two X.21, 15-pin connectors

ORDERING INFO

ASM31/115/530
ASM31/115/G703/TB
ASM31/115/UTP
ASM31/115/V24
ASM31/115/V35
ASM31/230/530
ASM31/230/G703/RJ
ASM31/230/G703/TB
ASM31/230/UTP
ASM31/230/V24
ASM31/230/V35
ASM31/230/X21
ASM31/48/V24
ASM31R/530
ASM31R/G703
ASM31R/UTP
ASM31R/V24
ASM31R/V35
ASM31R/X21

APPLICATION

 

RAD Products

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


     

1-301-924-7400
Sales Ext 17   Support Ext 25

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Olandwood Court
Olney, Maryland 20832