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Hardware Component Overview
DOCSIS Module
35
Modem Management
The DOCSIS Module exercises functional management over MAC layer and cable modem
processes.
MAC Layer Scheduling
Management at the MAC layer includes the following scheduling functions:
! Queueing upstream requests.
! Transmission opportunity allocation based on MAC messages from cable modems.
! QoS scheduling requirements, including congestion control, which have priority over
normal service flows.
! Prioritizing service flows for least delay.
! Maintenance opportunity allocation, including initial maintenance alignment.
Cable Modem Management
The DOCSIS Module performs the following cable modem management functions:
! Registration of cable modems by service identifier (SID) assignments, and recording
time and address failures.
! Ranging by adjusting timing offset, transmit power, carrier frequency, and transmit
equalizer taps.
Enhanced Routing and Bridging Features
The DOCSIS Module provides the following enhanced routing and bridging features that
provide additional value to MSOs:
! Simultaneous IP routing (Layer 3) and IEEE 802.1 bridging (Layer 2).
! ARP proxy.
! Address authentication for ARP and IP packets.
! 802.1Q and stacked 802.1Q VLANs.
! Security and service class assignment to multicast service flows.
! IGMP packet snooping.
See the JUNOSg Software Configuration Guide: Getting Started and System Management and the
JUNOSg Software Configuration Guide: Interfaces, Cable, Policy, and Routing and Routing
Protocols for more information on these and other DOCSIS Module features.