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Short Haul
Modem
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ASMi-50
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Features |
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2/4-wire MSDSL modem with remote
management, extending data transmission to 8.2 km (5.0
miles)
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Supports multiple data rates between
64 kbps and 1152 kbps
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Utilizes MSDSL 2B1Q line coding for
extended range and improved quality
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Provides an out-of-band operation
channel for end-to-end system management and supervision
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Supports a variety of digital
interfaces:
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Automatic rate detection in external
clock mode for tail-end applications
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Available as single and dual modem
cards for the LRS-24 modem rack with SNMP management or as a
single modem card for the ASM-MN-214 modem rack
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Available as a special version for
connecting to SDH systems with unstable clock
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Extensive diagnostics, including V.54
loopbacks, BER testing and line quality monitoring
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Setup, control and monitoring via the
front panel
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Description |
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ASMi-50, Multirate Single Pair
Digital Subscriber Line (MSDSL) modem, operates in full
duplex over 2-wire or 4-wire lines.
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The modem supports multiple data
rates, user-selectable to n x 64 kbps (n=1, 2, ..., 10, 12,
14, 15, 16, 18).
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ASMi-50 employs MSDSL 2B1Q technology
to extend the transmission range and provide efficient
transmission, even over poor quality lines (see Table 1
and Table 2). Operation over 4-wire link results in up
to 20% improvement in the maximum range of the modem.
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The modem uses an out-of-band channel
for controlling and monitoring the remote unit. The
management channel operates without interfering with data
transmission.
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ASMi-50 supports a wide range of
digital interfaces: V.24 (64 kbps, 128 kbps), RS-530, V.35,
V.35A, X.21, V.36/RS-449, G.703 Codirectional (64 kbps). In
addition, the modem supports built-in Ethernet bridge (IR-ETH),
Ethernet bridge with VLAN support (IRETH/Q) and IP router (IR-IP),
which allow LAN-to-LAN connectivity using MSDSL technology.
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ASMi-50 is managed via front panel
buttons and LCD screen. The ASMi-50C and ASMi-50CD modem
cards installed in the LRS-24 modem rack can also be managed
via RADview SNMP network management application. The
embedded menu-driven management software allows to control
the following parameters:
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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.
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A special version of ASMi-50 with
V.35 and RS-530 interfaces that designed to work with a
"high wander" external clock systems, supporting only 5
rates (256, 384, 512, 768 and 1152 kbps). This version can
handle clock fluctuations, phase hits, and jitters
introduced in large systems, such as hops in SDH networks.
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The ASMi-50 system configuration is
stored in Flash memory, minimizing system downtime when
power is down or when a remote unit is replaced.
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The out-of-band management channel
provides real time alerts for:
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ASMi-50 is available as "master" or
"slave" standalone units. The master version includes front
panel LCD and control buttons. The slave unit has a blank
front panel with a special 20-pin connector for a portable
control unit (PCU) connection.
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ASMi-50 is also available as a card
for the central office deployment:
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ASMi-50/R - single modem card for
RAD's ASM-MN-214, 19-inch modem rack
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ASMi-50C - single modem card for
RAD's LRS-24, modem rack with SNMP management
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ASMi-50CD - dual modem card for
LRS-24, ensuring higher modem density and reducing cost
per port.
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ASMi-50 has comprehensive diagnostics
capabilities that include the following test options:
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Email
