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RAD ASM-20 Sync/Async Short Range Modem 

ASM-20

Call us for Pre-sales and discount pricing


  301-924-7400 Support

ASM-10/8 Sync/Async Short Range Modem

RAD ASM-20 Sync/Async Short Range Modem 

Features
  • 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.

Specifications

    Table 1. Approximate Maximum Range

Baud Rate 19 AWG
(0.8 mm)
22 AWG
(0.6 mm)
24 AWG
(0.5 mm)
26 AWG
(0.4 mm)
kbps km miles km miles km miles km miles
256 3.75 2.3 2.85 1.75 2.25 1.4 1.9 1.2
192 6.0 3.7 4.5 2.8 3.5 2.2 2.7 1.7
144 10.6 6.6 6.75 4.2 4.5 2.8 3.4 2.1
128 12.4 7.7 7.3 4.5 5.0 3.1 3.6 2.2
115.2* 12.8 7.8 7.65 4.75 5.25 3.3 3.8 2.5
112 12.8 8.0 8.0 5.0 5.5 3.4 4.0 2.5
96 13.0 8.1 8.3 5.15 6.0 3.7 4.15 2.6
72 15.0 9.3 9.4 5.8 6.25 3.9 4.3 2.65
64 17.6 11.0 11.0 6.8 7.5 4.6 5.3 3.3
57.6* 18.8 11.7 11.75 7.3 8.0 5.0 5.6 3.5
56 18.8 11.7 11.75 7.3 8.0 5.0 5.6 3.5
48 19.4 12.0 12.2 7.6 8.25 5.2 5.8 3.6
38.4* 20 12.5 12.5 7.8 8.5 5.3 6.0 3.7
32 20.5 12.75 12.85 8.0 8.75 5.4 6.2 3.85
28.8* 20.5 12.75 12.85 8.0 8.75 5.4 6.2 3.85
19.2** 23.0 14.0 14.0 8.7 9.75 6.0 7.0 4.3

        * Asynchronous baud rates
        ** Sync/Async

ASM-20-2/*/+/#

Short range modem, stand alone unit

ASM-20-2R/+

Short range modem card for the
ASM-MN-214 19" rack

* Specify power supply
115 for 115 VAC
230 for 230 VAC
48 for -48 VDC
24 for 24 VDC
+ Specify interface
V24 for V.24/RS-232 (up to 64 kbps)
V35 for V.35
530 for RS-530
X21 for X.21
V36 for V.36/RS-449
703 for G.703 Codirectional (64 kbps)
UTP for built-in Ethernet bridge,
10BaseT with RJ-45
BNC for built-in Ethernet bridge, 10BaseT with BNC connector

Note: When using V.35 or X.21 interfaces for ASM-20-2R, the CIA adapter is required.

# Specify G.703 Codirectional connector
TB for terminal block connector
RJ for RJ-45 connector

RM-17

Hardware for mounting one or two standalone units in a 19" rack

CIA/&

Connector Interface Adapter for the
ASM-MN-214 19" rack

& Specify CIA connector option:
V35/1 for adapting one modem card's 25-pin connector into one V.35, 34-pin connector
X21 for adapting two adjacent modem cards' 25-pin connectors to two X.21, 15-pin connectors

Application
 

Figure 1 - Tail-end for Digital Network Application

Figure 2 - Point-to-point Application

 

ASM20-2/115/530
ASM20-2/115/G.703/RJ
ASM20-2/115/G703/TB
ASM20-2/115/UTP
ASM20-2/115/V24
ASM20-2/115/V35
ASM20-2/115/V36
ASM20-2/115/X21
ASM20-2/230/530
ASM20-2/230/G.703/RJ
ASM20-2/230/G703/TB
ASM20-2/230/UTP
ASM20-2/230/V24
ASM20-2/230/V35
ASM20-2/230/X21
ASM20-2/24/UTP
ASM20-2/48/UTP
ASM20-2/48/V35
ASM20-2/48/X21
ASM20-2R/530
ASM20-2R/V24
ASM20-2R/V35
ASM20-2R/V36
ASM20-2R/X21
ASM20/115/128/V35
ASM20/115/128/X21
ASM20/115/144/530
ASM20/115/144/V35
ASM20/115/144/X21
ASM20/115/64/V24
ASM20/115/G703
ASM20/230/128/530
ASM20/230/128/V35
ASM20/230/128/X21
ASM20/230/144/530
ASM20/230/144/V24
ASM20/230/144/V35
ASM20/230/144/X21
ASM20/230/64/V24
ASM20/230/G703
ASM20R/128/RS530
ASM20R/128/V35
ASM20R/128/V35/DC
ASM20R/128/X21
ASM20R/144/RS530
ASM20R/144/X21
ASM20R/64/V24
ASM20R/G703
ASM20R/G703/DC

 

RAD Products

For discount pricing on RAD Data Communications  
email us at sales@data-connect.com
or call 301-924-7400


     

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Sales Ext 17   Support Ext 25

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Olney, Maryland 20832