Sync/Async IDSL Modem

• Extends data transmission up to 8 km (5 miles)
• Supports multiple data rates between 1.2 and 128 kbps
• Provides automatic rate detection in external clock mode
• Supports V.54 diagnostics and BER testing
• Supports digital interfaces: V.24/RS-232, V.35, X.21, RS-530, V.36/RS-449, Ethernet (bridge) or G.703 codirectional
• Provides real-time alarm indication for local and remote units

• 2B1Q line coding provides immunity from background noise, eliminate normal line distortion, and enable efficient transmission over 2-wire twisted pair cables
• Provides full-duplex inband management of the remote unit over the D-channel
• Supports V.54 diagnostics and BER testing
• Provides real-time alarm indication for local and remote units

Extended range, user selectable rates

The ASMi-31 sync/async IDSL manageable modem operates full duplex over twisted pair, 2-wire unconditioned lines. It has a transmission range of up to 8 km (5 miles) over 24 AWG cable and operates at user-selectable rates from 1.2 kbps to 128 kbps.

The ASMi-31 sync/async IDSL modem can also work opposite the DXC with D8U cards, or opposite the Megaplex with the U interface module.

SNMP management is available for the cards inside the rack via the management channel and for the customer premises standalone units. The RADview SNMP application running on an HP OpenView UNIX platform or PC supports management of the ASMi-31 sync/async manageable IDSL modem and other RAD modems.

Based on 2B1Q technology

The ASMi-31 sync/async IDSL modem is based on 2B1Q technology, which is common to both ISDN and DSL technologies. This line code enables efficient transmission over poor quality lines. Transmit timing is provided internally or recovered externally from the received signal. It can also be derived externally from the digital interface, enabling tail-end applications.