Alcatel-Lucent 7342 - Soc Functional Blocks; Soc Functionality and Service Connections

5 — SoC based ONT functional blocks
Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06 July 2008 5-3
3FE 51892 AAAA TCZZA Edition 01 ONT Product Information Manual
The SoC consists of five key elements:
• GPON MAC
The GPON MAC element on the SoC provides the GPON interface to the TC
layer via the optical diplexer or triplexer (if using RF video). This interface
supports the FSAN standards compliant GEM mode transport and provides AES,
FEC, and data fragmentation functionality over the GPON as described in
G.984.3 (GPON TC Layer) ITU specification.
• Ethernet MAC
The SoC provides an Ethernet PHY device (either 10/100BaseT or
10/100/1000BaseT) between the GMII interface and the RJ-45 port.
• Digital Signal Processor (DSP) interface
The DSP provides voice processing and has a TDM interface to the
CODEC/SLIC devices.
• control processor
The control processor manages functions related to OMCI, IGMP, VoIP, and
Ethernet services.
• SoC bridge
The SoC bridge provides an integrated data channel between the Ethernet MAC,
the GPON MAC, the DSP, the control processor, and the other integrated
elements such as flash memory, SDRAM, the local bus controller, and the
DUART interface to the craft port if used.
SoC based ONTs can also interact with additional hardware components to support
functionality not provided by the SoC. For example, MoCA and CES functionality
require additional hardware support. These, and other additional elements are
described in the following sections along with the SoC based ONT functions.
5.3 SoC functional blocks
SoC based ONTs have the following functional blocks:
SoC functionality and service connections
The SoC is an integrated system that provides the GPON, voice, and data (including
IP video) subsystems. The SoC provides two key connection functions: connecting
the ONT to the GPON and the connecting the ONT to subscriber equipment. The
voice subsystem supports RJ-11 ports, and the data and IP video subsystems support
RJ-45 ports. The ONT connects to the GPON using a optical connector.
The GPON connection performs a GPON transmission convergence (TC) layer
function. The GPON signal from the P-OLT terminates at a diplexer. The diplexer is
an optical module that performs optical and electrical conversion. The diplexer
interfaces with the GPON MAC on the SoC. Figure 5-2 shows an ONT with a
diplexer, four POTS, and two Ethernet ports.
• GPON and service connections
• data and IP video subsystem
• voice subsystem
• time calibration