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RAD
ASM-31 2
Wire Async/Sync Shorthaul Modem |
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- The ASM-31, all-rate,
sync/async short range modem, operates full duplex
over 2-wire twisted pair, at selectable data rates
from 1.2 kbps up to 128 kbps.
- ASM-31 operates using
2B1Q line coding, and provides an operating range of
up to 5.5 km (3.4 miles), independent of the data
rate. An adaptive equalizer provides noise immunity
and high performance over low quality lines.
- Full duplex operation
is achieved using the echo cancellation technique.
This method entails setting one modem to be Master
clock and the other to be Slave clock.
- ASM-31 features
diagnostic capabilities including implementation of
local and remote loopbacks. The operator at either
end of the line may test both modems and the line in
a number of loopback modes. The loopbacks are
controlled by either a manual switch or from the DTE
interface.
- The modem also
includes a BER tester for complete end-to-end
integrity testing. An error LED indicates each bit
error detected.
- Front panel LEDs
provide indication for TD, RD, RTS and DCD, as well
as Power, Local and Remote Test and Sync Loss.
- Interface options
include V.24/RS-232, V.35, RS-530, X.21, G.703
Codirectional, and Ethernet (see Ordering). The
analog line connection is provided via an RJ-45 or a
3-port terminal block. Configuration is via internal
jumpers and straps.
- Line interface
circuitry protects against lightning and power
surges.
- ASM-31 is available as
a standalone unit or as a card for mounting in the
ASM-MN-214, 19" rack. The rack can carry up to
14 cards.
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