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Hardware Component Overview
DOCSIS Module
33
Figure 14: Packet Processing Layers
Higher Layer Functions
The DOCSIS Module provides the following higher layer functions:
! Packet filtering and forwarding—Filters Layer 2, Layer 3, Layer 4, and above based on
DOCSIS 1.1 filter functionality.
! CMTS management—SNMP, MIBs, and CLI (command-line interface).
! Network-side interface (NSI)—IP data and VoIP interfaces.
Classifier
Packet Header
Suppression
Frame
Generator
Encryption
Frame
Parser
Defragment
Deconcatenate
Decrypt
MPEG Groomer
MAC Layer
PHY Layer
Higher Layers
DTC Sublayer
PMD Sublayer
Upconverter Modem
Downstream
Downstream
Upstream
Upstream
MPEG
VoIP
Packet
Filtering
De-encapsulator
Forwarding
Higher Layer
Functions
Network Layer
Protocols
DOCSIS Data
to/from HFC
Data/IP
Network-Side Interface
Management/
Scheduler
CMTS
Management
Management/
Control
Management
Interface