High Speed Short Range Modem

RAD's ASM-40 high-speed short-range synchronous modem operates in full-duplex over 4-wire lines or BNC coaxial cable. The modem extends data transmission range up to 1.75 km (1 mile). The ASM-40 high-speed short-range synchronous modem can be used at different lines rates and comes with a variety of serial and Ethernet interfaces, making the modem suitable for rate and interface conversion applications. The unit is provided with extensive testing and diagnostics. The ASM-40 high-speed short-range synchronous modem comes as a standalone or can be mounted in the LRS-24 chassis.

• Can be used in rate and interface conversion applications

• Conforms to special telecom standards (Austel, TUV BABT, etc.)

• Provides extensive diagnostics, including loopbacks and BER testing

The ASM-40 is a high speed synchronous short range modem operating at 13 selectable data rates, from 32 kbps up to 2.048 Mbps with a range up to 1.75 km (1.1 miles).

The modem transmits data to the line at four data rates, depending upon the selected DTE rate or the PCM network. Data rates of 32, 64, 128, 256, 512, 1,024 and 2,048 kbps are transmitted at 2,048 kbps; data rates of 192, 384, 768 and 1,536 kbps are transmitted at 1,536 kbps; the 1,544 data rate is transmitted at 1,544 kbps; and the 1,920 data rate is transmitted at 1,920 kbps.

The modem’s line interface is coded using HDB3, AMI or B8ZS (strap-selectable). On the digital side, a choice of V.35, V.36/RS-449, X.21, RS-530, built-in Ethernet bridge, router or G.703/HDB3 interfaces is available. This also enables the ASM-40 to perform as an interface converter, a rate converter or a repeater for G.703.

The ASM-40 features V.54 diagnostic capabilities to perform local analog loopbacks and local and remote digital loopbacks. An internal test pattern complying with the V.52 standard can be generated to provide end-to-end integrity testing.

The ASM-40 is available as a standalone unit or as a card for the 19" ASM-MN-214 rack that holds up to 14 cards.

An SNMP-managed double modem card – ASM-40CD – is available for the LRS-24 chassis. This chassis can hold up to 24 modems and provides management from a central or remote management station. RADview, RAD’s SNMP management application, enables configuration, monitoring and diagnostics for the ASM-40CD cards, as well as for other modems in the LRS-24 modem rack.