RAD ASMi-24 Sync Short Range Modem with Remote Control

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ASMi-24 Sync Short Range Modem with Management

RAD ASMi-24 Sync Short Range Modem with Remote Control

  • The ASMi-24, Sync Short Range Modem with Remote Management, operates full or half duplex over twisted pair, 4-wire unconditioned lines. It has a transmission range of up to 10 km (6 miles) and operates at user-selectable rates from 48 to 144 kbps.
  • The modem uses PR4 line code (Partial Response Class IV), which provides immunity to background noise, eliminates normal line distortion, and enables efficient transmission over 4-wire twisted pair cables. Transmit timing is either provided internally, or recovered from the received signal (user-selectable). Alternatively, the transmit timing can be derived externally from the digital interface, enabling tail-end applications. The carrier may be continuous or controlled by RTS for passing control signals end-to-end (user-selectable).
  • The modem's front panel provides real-time indication on application status.
  • The modem uses an out-of-band management channel for controlling and monitoring the remote unit. Both data and management are transmitted over the same wires, simultaneously.
  • Menu-driven software allows soft-select monitoring and adjustment of local and remote unit parameters via the control keys and LCD.
  • ASMi-24 is available as a standalone unit in both ASMi-24/M "Master" and ASMi-24/S "Slave" versions. The Master version has a front panel LCD and control switches. The Slave unit has a blank panel, which prevents unauthorized changes to link parameters. ASMi-24 is also available as a card for central solutions:
    - ASMi-24/R - card for the ASM-MN-214 19" rack
    - ASMi-24C - card for the LRS-12 19" rack with central SNMP management.
  • Management of the local and remote modems for the ASMi-24/S and ASMi-24/R card versions is carried out via a standalone Portable Control Unit (PCU), through a special 20-pin connector on the modem front panel. The PCU is ordered separately (see Ordering).
  • All management functions, except for clock source and clock rate, can be initiated from the Slave unit PCU. The PCU, provided with a protective casing, can be stored in a technician's tool kit.
  • The following Master and Slave modem parameters are monitored and controlled via the front panel:
    - Baud rate
    - RTS, CTS delay
    - Carrier detection
    - Clock source
    - Carrier mode
    - V.54 loops enable
    - Built-in system configuration-saver in the event of power failure
    - TX LEVEL
    - RX SENSE.
  • The ASMi-24C card for the LRS-12 rack can be managed from an ASCII terminal or via an SNMP UNIX station connected to the rack. RADview, an SNMP application, is available for managing ASMi-24C cards and other RAD products. RADview enables management of a large number of links, system infrastructure, and presentation of statistical information on link availability. It is a user friendly system, utilizing a graphical presentation of all network elements.
  • ASMi-24 features a built-in BERT, which complies with the V.52 standard, and can be activated and monitored via the front panel. This feature enables complete testing of the line.
  • Tests which can be initiated via the Master front panel include activating local and remote loopbacks, and activating local BERT. Real-time link errors are displayed on the ERR LED, and BER RESULTS on the LCD screen.
  • Real time alerts indicated via the Master front panel include disconnection of the modem link, remote modem power failure, and carrier loss. Remote and local LED indicators can be displayed on the front panel of the Master unit.
  • The remote modem performs a Far Analog Loop self-check and displays real time errors on the LOCAL ERR LED, and BER RESULTS on the LCD screen.
  • Diagnostics of the modem link include real error rate display and simultaneous activation of BERTs on the local and the remote units.
  • Among many field interchangeable interfaces, ASMi-24 can be ordered with a built-in Ethernet (10BaseT) bridge interface. This option can be used for LAN to LAN connectivity over 4-wire extended range, using only a pair of ASMi-24 modems.


  • Extended range, baseband modem - up to 10 km (6 miles) at 64 kbps
  • Full management of local and remote modems via front panel
  • Remote out-of-band management for all line conditions
  • Real-time alarm indication for local and remote units
  • Selectable data rates:
    48 kbps up to 144 kbps
  • Fully compatible with ASM-24
  • Full or half duplex on 4-wire lines
  • V.54 and built-in BER tester diagnostics
  • Carrier control option
  • Supports digital interfaces: V.24/RS-232, V.35, X.21, V.36/RS-449, RS-530 or G.703 Codirectional
  • A special built-in Ethernet bridge for LAN to LAN connectivity
  • Card version available for ASM-MN-214 19" rack and LRS-12 19" rack with central SNMP management

Short Range Modem, standalone unit with internal power supply

Short Range Modem card for the ASM-MN-214 19" rack

19" rack for 14 modem cards

Short Range Modem Card for the ETSI LRS-12 rack

Short Range Modem Card for the ANSI LRS-12 rack

* Specify standalone and rack main power supply:
115 VAC for 115 VAC
230 VAC for 230 VAC
48 for -48 VDC
# Specify digital interface:
V24 for V.24/RS-232
V35 for V.35
V36 for V.36/RS-449
530 for RS-530 (V.11/RS-422 on 25-pin)
X21 for X.21
G.703/TB for G.703 Codirectional (64 kbps) with terminal block connector
G.703/RJ for G.703 Codirectional (64 kbps) with RJ-45 connector
G.703 for G.703 Codirectional (64 kbps) in rack card version
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 interfaces, the CIA adapter is required.

+ Specify Master or Slave:
M for Master
S for Slave
& Specify redundant power supply
for rack: (same options as main power supply).


Portable Control Unit with protective casing

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

& Specify CIA connector option:
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




Figure 1. Access for a Small Office in a Multiprotocol Environment

Figure 2. Central Site Application with SNMP Management







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