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RAD
ASMi-31 Async/Sync
Short Range Modem
with Management |
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- 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.
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