ASMi-52L, a RAD SHDSL modem, operates in full-duplex mode over 2-wire and 4-wire lines.
ASMi-52L supports multiple data rates in the range of 64 to 4608 kbps. The data rates depend on the line interface, DTE interface types, and operating clock modes.
ASMi-52L employs standard SHDSL TC-PAM technology to extend the transmission range (see Table 1), thus enabling carriers to reach more customers at lower costs.
X.21 and V.35 DTE interfaces are available. For LAN-to-LAN connectivity using SHDSL technology, the modem supports a built-in 10/100BaseT switch with one or four Ethernet ports, and VLAN transparent support.
With the ASMi-52L the full management and monitoring of the remote unit is achieved by using an Embedded Operation Channel (EOC). The management channel uses SHDSL overhead bits in compliance with ITU-T G.991.2 requirements, operating without interfering with the data transmission.
Management of Ethernet units is performed via the data port.
ASMi-52L units operate opposite centrally located DXC and ASMi-52CD/ASMi-52CQ cards installed in a LRS-24 rack (see Figure 1).
VLAN priority enables up to four QoS priority levels (for Ethernet units only).
Up to eight SHDSL repeaters can be installed in line to increase the operation range of the modem.
ASMi-52L provides basic management of the repeaters.
Supervision and configuration activities are performed using an ASCII terminal, IP hosts using the Telnet protocol, or RADview-EMS, (Java-based, modular, client-server, scalable element management system), providing secure configuration and fault management capabilities. The terminal port supports a dial-up modem connection for remote management of ASMi-52L over telephone lines.
An ASMi-52L modem with a 4-wire line interface can be configured to operate over 2-wire lines.
Comprehensive diagnostic capabilities of the ASMi-52L include:
Real-time alarms to alert the user on fault conditions (reported by the management station)
V.54 local analog and remote digital loopbacks
SHDSL statistics collection for 15-minute and 24-hour intervals.
Automatic configuration allows the current configuration to be uploaded and downloaded from a configuration file. The modem provides high-voltage line protection in compliance with ITU K.21 and UL1950 requirements.