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RAD ASM-24 Sync Short Range Modem

ASM-24

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  301-924-7400 Support

ASM-24 Sync Shorthaul Modem

RAD ASM-24 Sync Short Range Modem

Features
  • The ASM-24, High Speed Short Range Modem, operates synchronously at full or half duplex, over unconditioned twisted pair, 4-wire lines. It has a range of up to 26.4 km (16.5 miles), depending upon the wire gauge and data rate used (see Table 1). ASM-24 operates at data rates from 48 up to 144 kbps (48-128 kbps for V.24).
  • The line code used, PR4 (Partial Response, Class IV), reduces bandwidth requirements, providing excellent performance and long range.
  • ASM-24 incorporates interface circuits for the DTE, an automatic equalizer, a modulator, a demodulator, and diagnostics circuitry. It is coupled to the line through isolation transformers which, in conjunction with other circuitry, protect against AC or DC overvoltages. The protection circuitry enables operation even when DC is connected to the line.
  • Transmit timing is provided internally, or is derived externally from the data terminal or receive signal. Receive timing is derived from the line received signal.
  • ASM-24 features V.54 diagnostic capabilities to perform local analog loopback, and local and remote digital loopbacks. The loops can be activated manually from the front panel or via control signals from the digital interface.
  • A built-in Bit Error Rate Tester (BERT) enables 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. When a bit error is detected, the ERR LED flashes.
  • ASM-24 is available as a standalone unit or as a rack-mount card for the ASM-MN-214 19" modem rack. The rack can carry up to 14 cards and is supplied with 25-pin D-type connectors.
  • Optional rack mounting hardware is available for mounting one or two standalone units in a 19" modem rack.

Specifications

  • High-speed, extended range, baseband modem
  • Synchronous operation, full or half duplex
  • Selectable data rates, from 48 to 144 kbps
  • Range up to 10 km (6.2 miles) at 64 kbps, over 24 AWG
  • Carrier control
  • V.54 diagnostics:
    Internal test pattern generator and error detection
  • Interface options for:
    V.24/RS-232, V.35, V.36/RS-449, RS-530,
    X.21, G.703 Codirectional (64 kbps), and built-in Ethernet bridge
  • Line protection circuits

ASM-24SA/*/#
Short Range Modem, standalone unit with internal power supply

ASM-24R/#
Short Range Modem card for the ASM-MN-214 19" rack

Note: When using V.35 or X.21 interfaces, the CIA adapter is required.

ASM-MN-214/*/&
19" rack for 14 modem cards

* Specify supply voltage for a
standalone unit and main power
supply for the modem rack:
100 for 100 VAC
115 for 115 VAC
230 for 230 VAC
48 for -48 VDC
24 for 24 VDC
# Specify interface:
V24 for V.24 or RS-232
V35 for V.35
V36 for V36 or RS-449
530 for RS-530
(V.11/RS-422 on 25-pin)
X21 for X.21
ETH UTP for built-in Ethernet/802.3 bridge with RJ-45 connector
ETH BNC for built-in Ethernet/802.3 bridge with BNC connector
G.703/TB for G.703 Codirectional (64 kbps) with terminal block
G.703/RJ for G.703 Codirectional (64 kbps) with RJ-45 connector
& Specify second, redundant power supply for the rack:
100 for 100 VAC
115 for 115 VAC
230 for 230 VAC
48 for -48 VDC
24 for 24 VDC

RM-17
Hardware for mounting one or two standalone units in a 19" rack

CIA/V35
Adapter for changing one modem card's 25-pin connector into one V.35 connector

CIA/X21
Adapter for changing two adjacent modem cards' 25-pin connectors to two X.21 connectors

 

ORDERING INFO
 

ASM24/115/530
ASM24/115/G703/TB
ASM24/115/UTP
ASM24/115/V24
ASM24/115/V35
ASM24/115/V36
ASM24/115/X21
ASM24/230/G703/RJ
ASM24/230/G703/TB
ASM24/230/RS530
ASM24/230/UTP
ASM24/230/V24
ASM24/230/V35
ASM24/230/X21
ASM24/48/V24
ASM24/48/V36
ASM24R/530
ASM24R/G703
ASM24R/V24
ASM24R/V35
ASM24R/X21

 

RAD Products

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


     

1-301-924-7400
Sales Ext 17   Support Ext 25

2017 Data Connect Enterprise
3405
Olandwood Court
Olney, Maryland 20832