ASMi-24 Sync Short Range Modem with Management

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RAD ASMi-24 Sync Short Range Modem
with Management

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 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 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.

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