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RAD
ASMi-50 2 and 4
Wire Extended Modem |
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- The ASMi-50,
Synchronous Short Range Modem, operates in full
duplex over 2 and 4-wire lines. Operation over
4-wire link provides 10% improvement in the maximum
range of the modem. Data rates are user selectable
between 64 kbps and 1152 kbps.
- The modem employs MS-DSL
2B1Q technology to extend the transmission range
(see Table 1 and Table 2) and provide efficient
transmission, even over poor quality lines.
- 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,
activated from the front panel, allows soft-select
monitoring and adjusting of local and remote units.
The software menus allow the user to monitor and
control the following parameters:
- Baud rate (when set to Internal or Receive mode)
- Clock source
- Output transmit level
- Loop activation
- Internal BER tester activation
- LED status of local and remote units
- Setting both local and remote units to default
settings
- Real time monitoring of link status
- Real time alert of fault conditions
- Real time signal quality monitoring.
- The transmit clock is
derived from three different selectable sources:
- Internally from a built-in oscillator
- Recovered from the received signal
- From the digital interface (for tail-end
applications).
- When set to external
mode, ASMi-50 automatically detects the clock rate
coming from the digital interface and sets the
remote unit to the same rate. When the digital
interface rate is changed, both local and remote
units follow the new rate and synchronize
accordingly.
- ASMi-50 supports a
wide range of digital interfaces: V.24 (64 kbps),
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-50 link, saving the need for an external
bridge.
- The ASMi-50 system
configuration is stored in non-volatile memory,
minimizing system down-time when power is down or
when a faulty remote unit is replaced.
- The out-of-band
management channel provides real time alerts for:
- Disconnection of the digital data transmission
- Disconnection of the management channel
- Remote modem failure
- Loop activation.
- Real time indication
of system status is provided on the front panel's
LCD for the local and remote modems.
- ASMi-50 is available
as a standalone unit in both ASMi-50/M
"Master" and ASMi-50/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-50 is also available as a card for
central solutions:
- ASMi-50/R - card for the ASM-MN-214 19" modem
rack
- ASMi-50C - card for the LRS-12 19" modem rack
with central SNMP management.
- Management of the
local and remote modems in the ASMi-50/S and
ASMi-50/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).
- The ASMi-50C 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 the ASMi-50C 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 providing
a graphical presentation of all network elements.
- Diagnostic features
include different loop activations, as well as an
internal BER tester. The loops available are:
- Local analog loopback
- Local digital loopback
- Remote digital loopback
- Remote analog loopback.
The loops can be activated from the front panel, PCU
(Portable Control Unit) or from the digital
interfaces that support loop activation signals
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