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RAD
ASM-20 Sync/Async Short Range Modem |
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- The ASM-20 Short Range
Modem operates synchronously or asynchronously
(strap-selectable) at full or half duplex over
unconditioned lines. It has a range of up to 23 km
(14 miles) and operates at data rates from 19.2 kbps
up to 256 kbps.
- The use of conditioned
diphase modulation (EUROCOM Std. D1) provides
immunity to background noise, eliminates normal line
distortion and enables efficient transmission and
reception of serial data over twisted pair cable.
Transmit timing is provided internally, or is
derived externally from the data terminal or receive
signal. Receive timing is regenerated from the data.
- When set to async
mode, ASM-20 performs async to sync conversion in
compliance with ITU V.14 standard. Table 1 details
the rates relevant for sync and async. Rates higher
than 115.2 kbps are supported in sync mode only.
- ASM-20 features V.54
diagnostic capabilities to perform local analog
loopback, and local and remote digital loopback. The
loops can be manually activated from the front panel
or via control signals from the interface connector.
In addition, ASM-20 incorporates a built-in Bit
Error Rate Tester (BERT) to enable complete testing
of both modems and the line. A front panel switch
generates a pseudo-random test pattern (511 bits)
according to ITU V.52, for testing end-to-end
connectivity. An ERROR LED flashes when a bit error
is detected.
- ASM-20 is available as
a desktop unit or as a card for the ASM-MN-214 modem
rack. The rack can carry up to 14 ASM-20 cards and
is supplied with 25-pin D-type connectors.
- Optional hardware is
available for mounting one or two standalone units
in a 19" rack.
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