RAD ASM-61 Installation and operation manual - page 16
Chapter 1 Introduction
Installation and Operation Manual
1-4
Technical Specifications
ASM-61 Ver. 1.0
The modem consists of the following major modules:
• Ethernet Block includes an external Ethernet component configured as a
single PHY and connected in one end at LAN interface by passive components
and to the second end to a standard Ethernet device acting as MAC (Media
Access Controller). By autonegotiation procedure each MAC can configure its
Ethernet PHY independently of the remote site. The configuration parameters
are: 10 Mbps or 100 Mbps, half or full duplex, backpressure in half duplex.
MII serial management configures all those parameters to PHY. It also includes
embedded 8-kilobyte Ethernet transmit and 16-kilobyte Ethernet receive
buffers.
• VDSL Digital Block is based on a QAM VDSL data pump serving as an
Ethernet physical layer. The VDSL digital block operates as a master (CO) or
slave (CPE). It includes an Ethernet interface, an AFE interface, an embedded
micro-controller for standalone operation and monitoring. VDSL digital block
is built around a DSP, which is based on a QAM VDSL data pump serving as
an Ethernet physical layer. It includes an Ethernet interface (described above),
an AFE interface, and an embedded micro-controller for standalone operation
and monitoring. In addition, it provides an embedded operation channel for
the control of remote unit. The VDSL digital block operates at symmetrical line
rate of 12.5 Mbps, including the standard VDSL channels, delivering a user
data payload at 11.25 Mbps. This block operates as ‘master’ (CO) or ‘slave’
(CPE). The VDSL digital block complies with VDSL standard requirements in
respect of data randomizer support, Reed-Solomon forward error correction
(FEC) and convolution interleave algorithm for noisy environment and poor
quality lines. The DSP configures the DSL analog block via the AFE interface.
• VDSL Analog Block is built around the VDSL-A analog chip. It employs an
external crystal oscillator to provide timing for the system. Analog output from
the VDSL analog chip drives the differential line driver. The VDSL filters and
hybrid perform upstream and downstream channel separation.
1.4 Technical
Specifications
Line Interface
Protocol
Very High-bit-rate Digital Subscriber Line (VDSL)
Type
2-wire, unconditioned dedicated lines (twisted pair)
Line Rate
10 Mbps, symmetric
Payload Rate
Greater than 10 Mbps, symmetric (11.25 Mbps)
Line Coding
QAM-based
Range
1 km (0.6 miles)
Duplexing Method
Frequency Division Duplexing (FDD)
Synchronization
Link activation less than 1 sec at warm restart, with
blind timing recovery and blind training algorithm
Line Impedance
100Ω
Output Power
10 dBm