ASMi-54L SHDSL.bis Modem
ASMi-54L SHDSL.bis Modem from RAD transports Ethernet and E1 traffic at high speed over copper links.
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
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
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.
ASMi-54L SHDSL EFM BONDING
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.
ETHERNET SUPPORT WITH ASMi-54L SHDSL MODEM
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.
QUALITY OF SERVICE
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
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.
PHYSICAL INFO ON ASMi-54L SHDSL MODEM
ASMi-54L is available with several power supply options:
AC/DC wide range (100 to 240 VAC, -48 to -60 VDC nominal)
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 RADs optional rack mount kits
(see Ordering). The ASMi-54L SHDSL modem is also available in extended temperature versions (by special
data sheet on ASMi-54L (pdf)