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JUNOSg 3.0 G10 CMTS Hardware Guide
iv
Data Packet Processing..........................................................................32
Higher Layer Functions...................................................................33
MAC Layer Functions......................................................................34
Physical Layer Functions.................................................................34
Modem Management .............................................................................35
MAC Layer Scheduling ....................................................................35
Cable Modem Management ............................................................35
Enhanced Routing and Bridging Features...............................................35
Physical and Electrical Characteristics...........................................................36
Chassis Control Module ........................................................................................37
Functional Characteristics..............................................................................38
Configuration, State, and Alarm Data.....................................................40
Physical and Electrical Characteristics...........................................................40
NIC Module...........................................................................................................42
Functional Characteristics..............................................................................44
Physical and Electrical Characteristics...........................................................44
Chassis Rear Modules...........................................................................................48
NIC Access Module........................................................................................48
HFC Connector Module .................................................................................50
Switched I/O Module .....................................................................................53
Hard Disk Module..........................................................................................55
Chapter 3
System Architecture Overview.....................................................................57
JUNOSg Internet Software Overview.....................................................................57
Routing Engine Software Components ..........................................................58
Routing Protocol Process........................................................................58
Routing Protocols............................................................................58
Routing and Forwarding Tables ......................................................59
Routing Policy ................................................................................59
Interface Process....................................................................................60
SNMP and MIB II Processes....................................................................60
Management Process .............................................................................60
Routing Engine Kernel ...........................................................................60
Tools for Accessing and Controlling the Software..........................................61
Software Monitoring Tools.............................................................................61
Software Installation and Upgrade Procedures ..............................................61
Data Path Processing............................................................................................62
Downstream Data Path .................................................................................62
Upstream Data Path......................................................................................63