6 — LP MDU, MDU, and modular ONT hardware functional blocks
6-8 July 2008 Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06
ONT Product Information Manual Edition 01 3FE 51892 AAAA TCZZA
Table 6-8 VDSL2 subsystem functions
Note
(1)
Sixteen Radio Frequency Interference (RFI) bands can be configured for the 7342 ISAM FTTU. Not
every RFI band listed in International Telecommunication Union (ITU) specification ITU-R PN.525-2
can be configured. For more information on supported RFI bands, contact your Alcatel-Lucent
support representative.
Voice subsystem
The LP MDU ONT provides voice service using VoIP technology. Voice services
are delivered through an RJ-21 connector.
The LP MDU ONT supports an interworking function from the analog POTS lines
to the VoIP or Ethernet layers. Each LP MDU outdoor ONT provides the following:
• up to 24 combination POTS/VDSL2 lines (12 POTS lines and 12 more POTS
lines that can be shared with VDSL2 lines on the VDSL2 LP MDU ONT while
the GE LP MDU ONT features 24 POTS-only lines with no combination lines)
• support for G.711 and G.729 CODEC; the support for G.729 requires reduced
channel number with a software upgrade
• fax per T.38 on POTS lines
The VoIP DSP supports up to eight POTS channels. Three DSPs reside on the
motherboard and interface with dual CODEC/SLIC devices on the service board
using TDM.
The DSP provides an Ethernet MII and a host interface in support of RTP data and
control data. The DSP supports VLAN tagging for RTP data transfers.
Each DSP located on the motherboard connects to four dual CODEC and dual SLIC
voice port devices on the service board, which provide up to eight POTS channels.
Function Description
VDSL2 8 port
burst mode
engine (BME)
(only 4 ports
used)
A data pump that uses discrete multi-tone (DMT) modulation. Each VDSL2 BME
uses only four of the eight ports. The BME receives Ethernet packets from the
Alexandria FPGA on the motherboard over a quad-port SS-SMII interface
operating at 125 MHz and also receives an 8 bit memory mapped microprocessor
interface (MPI) from the Alexandria FPGA used for program downloads, control,
and monitoring functions. The BME interfaces with the AFE.
VDSL2 quad port
analog front end
(AFE)
Interfaces with the BME and the IFE and provides converters and on chip digital
signal processing
VDSL2 quad port
integrated front
end (IFE)
An integrated circuit that connects to the line driver and integrates all
commonly used filters for worldwide deployment
VDSL2 line driver
(LD)
A two-port differential device that provides the functionality required to
implement a line interface for concentrators (CO) & DSLAMs. A transformer
connects each port of the line driver with the line. On the network side, it is
connected to the IFE.
998E30 Bandplan The total frequency spectrum partitioned for upstream and downstream
transmission.
Custom RFI
notching
(1)
Reduce the power spectral density within certain frequency bands to reduce
egress into other areas.
To Next Page
Loading...