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RAD
ASM-32
Dual Port Async/Sync Shorthaul Modem |
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- The ASM-32, dual port,
sync/async short range modem, operates full duplex
over 2-wire twisted pair, at selectable data rates
from 1.2 kbps to 128 kbps.
- Each port can operate
sync or async, at data rates from 1.2 kbps up to 64
kbps, and has a digital interface independent from
the second port. When operated at 128 kbps (sync),
only one port can be used.
- Full duplex operation
over 2-wires is achieved using an echo cancelling
technique. ASM-32 uses 2B1Q line coding, and
provides an operating range of up to 8 km (5 miles)
over 24 AWG cable, independent of the data rate. The
line interface includes an adaptive equalizer, which
provides better noise immunity and high performance
over low quality lines.
- Three clock modes are
available:
- Internal: ASM-32 generates the clock
- Receive (loopback): the clock is recovered from
the line
- External: the clock received on port 1 is used as
the system clock.
- An internal 511-bit
test pattern generator is available in each port for
diagnosing the ports and the main link connections.
Six different V.54 loopbacks are available to check
each port or main link integrity. The loopbacks are
controlled by either a front panel switch or from
each of the digital interfaces.
- Front panel indicators
provide indication for TD, RD, RTS, DCD, local and
remote loopbacks, general sync loss for each port,
and power indication.
- Digital interfaces
include
V.24/RS-232, V.35, V.36/RS-449 (RS-530 version plus
cable for DB-37 connector), RS-530, X.21, or G.703
Codirectional (64 kbps), and Ethernet.
- Two different analog
line interface connectors are available: RJ-45 or
3-port terminal block (see Ordering).
- ASM-32 is supplied as
a standalone unit. Special hardware (RM-17) for
mounting one or two units in a 19" rack can be
ordered separately
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