RAD ASMi-31 Sync/Async 2-Wire Manageable IDSL Modem


• 2-wire IDSL modem with remote management
• Data range of up to 7.0 km (4.3 mi)
• Multiple data rates between 1.2 and 128 kbps
• 2B1Q line coding for extended range and improved quality
• Full-duplex inband management of the remote unit over the D-channel

2-wire full-duplex IDSL modem with remote management extends data transmission to 7.0 km (4.3 miles)

ASMi-31 is a 2-wire full-duplex IDSL modem with remote management that extends data transmission to 7.0 km (4.3 miles) irrespective of data rate. ASMi-31 operates synchronously or asynchronously at user-selectable data rates from 1.2 to 128 kbps.
The modem uses 2B1Q line code and adaptive equalizers to provide immunity from background noise, eliminate normal
line distortion, and enable efficient transmission over 2-wire twisted pair cables.
ASMi-31 is available as a “master” or “slave” standalone unit. The master modem includes a front panel LCD and control buttons. The slave modem has a blank front panel with a special 20-pin connector for a portable control unit (PCU) connection.

The master modem provides full-duplex inband management of the remote unit. Management data is transmitted over the
D-channel to ensure simultaneous configuration of the local and remote units, activation of real-time alerts on system faults, and initiation of diagnostic tests.
ASMi-31 supports a wide range of digital interfaces: V.24/RS-232, V.35, X.21, RS-530, V.36/RS-449 and G.703 Codirectional (64 kbps). In addition, the modem supports a built-in Ethernet bridge (IR-ETH) and IP router (IR-IP) to allow
LAN-to-LAN connectivity using IDSL technology. ASMi-31 can be managed via the front panel buttons and LCD (in the master unit).
The ASMi-31 clock source depends on the modem's functional mode (master or slave):
• Master clock: INT derived from internal oscillator or EXT derived from the DTE interface
• Slave clock: RCV (recovered from line signal).
The user-selectable carrier may be continuous or controlled by RTS for passing control signals end-to-end. ASMi-31 has wide diagnostic capabilities that include the following test options:
• V.54 local analog and remote digital loopbacks
• BER testing per V.52. Line interface circuitry protects against lightning and power surges.

Ordering Information: See Below (illustration)


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