Juniper Networks G10 CMTS manual Distribution panels are also separated into domains a and B

Chassis

•		The midplane is partitioned into domains A and B as described in Table 5. This is required by
•		the bus length restrictions stipulated in the cPCI specification. The power supplies and power
•		distribution panels are also separated into domains A and B.
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•	Table 5: Midplane Configuration
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•		Domain	Slot		Front of Midplane	Rear of Midplane
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		A	1		DOCSIS Module	HFC Connector Module or SIM
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			2		DOCSIS Module	HFC Connector Module or SIM
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•			3		DOCSIS Module	HFC Connector Module or SIM
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			4		DOCSIS Module	HFC Connector Module or SIM
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			5		NIC Module	NIC Access Module
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•			6		Chassis Control Module	CCM Access Module
•		B	7		Chassis Control Module	CCM Access Module
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			8		Blank	Blank
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		B	9		NIC Module	NIC Access Module
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•			10		DOCSIS Module	HFC Connector Module or SIM
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			11		DOCSIS Module	HFC Connector Module or SIM
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			12		DOCSIS Module	HFC Connector Module or SIM
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			13		DOCSIS Module	HFC Connector Module or SIM
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•				Release 3.0 does not support Chassis Control Module
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				redundancy.
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•		The division of the domains is between slots 6 and 7. Each domain includes up to four
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•		DOCSIS Modules, a NIC Module, and a Chassis Control Module in the front, and up to four
•		HFC Connector Modules or SIMs, a NIC Access Module, and a Hard Disk Module in the rear.
•		The number of modules depends on your planned capacity.
•		The domains are bridged by the Chassis Control Module. Slots 6 and 7 are keyed to accept
•
•		only a Chassis Control Module in the front and a Hard Disk Module in the rear. Peripheral
•		interrupts, clocks, and bus arbitration signals are routed to these system slots. Continuity of
•		the bus across the midplane is accomplished by the two cPCI buses extending beyond their
•		system slots to connect with the system slot of the other domain, as shown in Figure 10 on
•		page 25. The electrical connection of the Chassis Control Module to both buses is controlled
•		by a PCI-to-PCI bridge in the module.

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24 JUNOSg 3.0 G10 CMTS Hardware Guide