• The ASMi-31, Remote Control Sync/Async Short Range 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 wire (see Table 1) and operates at user selectable rates from 1.2 kbps to 128 kbps.

• The modem uses 2B1Q line code and adaptive equalizers, which provide immunity to background noise, eliminate normal line distortion and enable efficient transmission over 2-wire twisted pair cables.

• Transmit timing is either provided internally, or recovered from the received signal (user-selectable). Alternatively, the transmit timing can be detected automatically and 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).

• 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, an Ethernet/802.3 bridging option enables direct connections of an Ethernet LAN to both sides of the ASMi-31 link.

• The ASMi-31 system configuration is stored in non-volatile memory, minimizing system down-time when power is down or when a faulty remote unit is replaced.

• Setup, status, alarms and diagnostics can be monitored and activated from the ASMi-31 front panel, or via a standalone portable control unit (PCU). Alternatively, the ASMi-31 can be managed from an ASCII terminal or an SNMP Unix/PC station connected to LRS-12/24.

• Line interface circuitry protects against lightning and power surges.

• ASMi-31 is available as a standalone unit in both ASMi-31/M "Master" and ASMi-31/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-31 is also available as a card for central solutions.

Specifications

• 2-wire, full duplex, short range modem
• Remote management using an in-band channel
• 2B1Q line coding
• Operating range up to 8 km (5 miles) over 24 AWG wire, independent of data rate
• Real-time alarm indication for local and remote units
• Selectable data rates from 1.2 kbps up to 128 kbps
• Fully compatible with ASM-31 and SRM-31
• Works opposite MP-2100/HS-U module and U-RPT (ASMi-31-2 only)
• Card version for ASM-MN-214 19" rack and LRS-12 19" rack with central SNMP management
• Configuration and monitoring of local and remote units from front panel
• V.54 and built-in BER tester diagnostics
• Supports various digital interfaces: V.24/RS-232, V.35, X.21, V.36/RS-449, RS-530, G.703 Codirectional, or built-in Ethernet bridge
• Automatic rate detection in external clock mode

ORDERING INFO

ASMI-31-2/CB/V24
ASMI-31-2/M/115/V24
ASMI-31-2/M/115/V24/V110
ASMI-31-2/M/115/V35
ASMI-31-2/M/230/G703/TB
ASMI-31-2/M/230/V24
ASMI-31-2/M/48/V24
ASMI-31-2/M/48/V24/V110
ASMI-31-2/S/115/V24
ASMI-31-2/S/230/G703/TB
ASMI-31/CQB/V24/RJ
ASMI-32/S/115/V35/RJ

APPLICATION