Juniper Networks G10 CMTS manual G10 Cmts Components

G10 CMTS Components

•G10 CMTS Components

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•	The G10 CMTS chassis employs front and rear modules that connect through a midplane.
•	Most of the cable connections are available in the rear of the unit. Following is a list of the
•	primary modules of the G10 CMTS:
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•	! NIC Module—Provides Ethernet switching functionality for upstream and downstream
•	traffic and for the Fast Ethernet interfaces. Houses two Gigabit Ethernet ports with
•	Gigabit Interface Converters (GBICs).
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•	! NIC Access Module—Fans out the Ethernet signals to individual 10/100Base-T lines,
•	which route to the HFC Connector Modules or Switched I/O Modules. A version of the
•	chassis provides internal Ethernet wiring between the NIC Modules and the DOCSIS
•	Modules.
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•	! DOCSIS Module—Performs all data path processing functions, including Layer 2 bridging
•	and Layer 3 forwarding. Processes IP data into DOCSIS packets. Converts and modulates
•	data for RF transmission. Reverses these processes for upstream data.
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•	! HFC Connector Module—Provides cable interfaces for a DOCSIS Module. Contains the
•	Fast Ethernet connectors for network-side data and the F-connectors for the HFC
•	cabling.
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•	! Switched I/O Module—Provides the same functions as an HFC Connector Module, but
•	provides four additional upstream F-connectors for the HFC cabling.
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•	! Chassis Control Module—Provides the management interface and runs the Routing
•	Engine software. Controls redundant protection functions and supplies software images
•	to all DOCSIS Modules. Runs the Simple Network Management Protocol (SNMP) agent
•	and environmental monitoring.
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•	! Hard Disk Module—Contains the system nonvolatile memory implemented as a hard
•	disk. This module is installed opposite the Chassis Control Module.
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•	The G10 CMTS relays traffic between DOCSIS RF interfaces, on which the cable modems
•	reside, and the network-side interfaces (Fast Ethernet and Gigabit Ethernet). Figure 3 on
•	page 9 illustrates the relationship between the primary modules in the chassis.
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•	Each DOCSIS Module can support up to four cable interfaces, where a cable interface (MAC
•	domain) contains at least one downstream interface and one upstream interface. Each NIC
•	Module supports two Gigabit Ethernet interfaces and four Fast Ethernet interfaces. The
•	Chassis Control Module provides an out-of-band Fast Ethernet management interface.
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•	See the JUNOSg Software Configuration Guide: Interfaces, Cable, Policy, and Routing and Routing
•	Protocols for more information on interfaces.
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8 JUNOSg 3.0 G10 CMTS Hardware Guide