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ASMi-54L SHDSL.bis Modem 

ASMi-54L SHDSL.bis Modem from RAD transports Ethernet and E1 traffic at high speed over copper links.

ASMi-54L SHDSL modem from RAD

Key features of the RAD ASMi-54L modem include:
• 2/4-wire managed modem transmitting at full-duplex data rates of up to 5.7 Mbps over 2-wire and 11.4 Mbps over 4-wire lines
• Dual Bearer mode for E1 and Ethernet HDLC over 2-wire and 4-wire lines
• SHDSL bonding – for EFM: PAF according to IEEE802.3, for HDLC: M-Pair according to G.991.2
• SHDSL ITU-T G.991.2 and ETSI 101524 compliance
• 4-port 10/100BaseT interface with integrated switch
• Fully compatible with ASMi-54 standalone modem
Application for ASMi-54L SHDSL modem

ASMi-54L is a simple, cost-effective, dedicated managed SHDSL.bis modem that extends the range of high-speed services over existing copper pairs. The modem is used for point-to-point Ethernet and E1 service extension at rates of up to 11.4 Mbps using bonding technology (see Figure 1).

Using TC-PAM 16 or TC-PAM 32 line coding SHDSL.bis technology, the modem operates in full-duplex mode over 2/4-wire lines at data rates of up to 5.7/11.4 Mbps.

The RAD ASMi-54L modem employs TPS-TC framing 64/65o for EFM (IEEE802.3) and HDLC (G.991.2) on the SHDSL link.

ASMi-54L performs line probing according to G.991.2. When enabled, the DSL interface adapts its rate to the condition of the line (noise, loop attenuation, etc.). When disabled, traffic on the DSL line is transmitted at a fixed rate selected by the
user. ASMi-54L can operate as a CO device or a CPE device according to user configuration.

Up to eight SHDSL repeaters can be installed in line to increase the operation range of E1- and Ethernet-based modems.

Central site and remote  locations connected by ASMi-54L SHDSL modems

EFM bonding on the Ethernet interface ensures that a failure or addition of a link does not drop the traffic being transmitted over the other wires in the group. The capacity of the group does not decrease when a new link is added at a lower rate.


ASMi-54L features up to four Ethernet 10/100BaseT ports with half/full-duplex, auto-negotiation and flow control. The
fault propagation functionality enables the unit to shut down the Ethernet user port when an SHDSL line failure is detected.
LANs are connected by bridging.

The internal forwarding of Ethernet traffic can be configured in two ways:
• By specifying the ports (a mode identified as unaware in accordance with Metro Ethernet Forum (MEF) standards). In this mode, all the Ethernet traffic reaching one of the ports is forwarded to the other port, and vice versa
• By using VLANs for classification: (a mode identified as aware in accordance with Metro Ethernet Forum (MEF) standards). In this mode, Ethernet traffic reaching one of the ports is forwarded to another port in accordance with its VLAN identifier.


The 802.1D, DSCP, and Per Port priority schemes used by the ASMi-54L SHDSL modem allow users to define different
QoS levels according to application requirements.

The ASMi-54L SHDSL modem implements the IEEE's 802.1q standards to provide VLAN-tagging with four levels of prioritization, enabling carriers to offer differentiated Ethernet services. VLAN tagging can also be employed to separate traffic, ensuring transparency of the customer traffic and bolstering security of management traffic. The user can activate or deactivate the priority mechanism, and each priority (VLAN priority, DSCP or per port) can be configured and mapped to one of four priority queues.

ASMi-54L SHDSL modem data rates


The ASMi-54 unit can be managed using the following connections:
• Local RS-232 terminal
• Telnet server, SNMP (Ver.1)
• Web server (ConfiguRAD)
• Inband management with or without dedicated VLAN.


ASMi-54L is available with several power supply options:
• AC/DC wide range (100 to 240 VAC, -48 to -60 VDC nominal)
• 24 VDC.

The RAD ASMi-54L SHDSL modem is encased in a compact half-19” plastic enclosure that can be mounted alone or in pairs in a 19-inch rack using RAD’s optional rack mount kits (see Ordering). The ASMi-54L SHDSL modem is also available in extended temperature versions (by special request).

Comparison of ASMi-54L SHDSL modem to others in the ASMi-5x series

Product data sheet on ASMi-54L (pdf)

Immediate price quote - Call 727-398-5252 or e-mail cs@bestdatasource.com

Don't forget to ask about  RADCare support for your RAD products.

Other RAD sections of interest:
RAD Accessories, RAD ATM products, RAD Baseband modems and last mile access, RAD Cables & Misc, RAD Digital Service Access Devices ( FCD ), RAD Fiber Optic modems and Converters, RAD IP and Ethernet Access, RAD Kilomux Data, Voice, Fax and LAN integrating Multiplexers, RAD LRS Modem rackRAD MegaplexRAD Networks Management, RAD Optimux Fiber MultiplexersRAD Sharing Devices, RAD Short Range ModemsRAD T1/E1 Digital Cross Connects ( DACS ), RAD T1/E1 Digital Cross Connect (DACS) for single E1 / T1 applications, RAD TDMoIP, RAD Voice Interface Converters, RAD Voice Trunking Gateway

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Last modified: January 17, 2015
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