Juniper Networks G10 CMTS manual Power Transition Modules

Chassis

•	Table 7: Power Supply Specifications
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•		Power Supply			Output	Maximum
•		Type	Input Voltage	Input Current Rating	Voltage	Output Current
•
		AC	90 to 240 VAC	2.5 A Nom (110 V, 70 percent efficiency)	+5.0 VDC	25.0 A
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			47 to 63 Hz
					+3.3 VDC	35.0 A
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•					+12.0 VDC	8.0 A
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					–12.0 VDC	1.5 A
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		DC	–36 to –72 VDC	6.0 A Nom (–48 VDC)	+5.0 VDC	25.0 A
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					+3.3 VDC	35.0 A
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•					+12.0 VDC	8.0 A
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					–12.0 VDC	1.5 A
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•		The +5.0 VDC and +3.3 VDC outputs supply a combined maximum of 175 W using load
•		sharing.
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•			You cannot use a 250 watt AC power supply and a
•			200 watt AC power supply in the same G10 CMTS chassis.
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•	Power Transition Modules
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•		The external power sources for the CMTS connect to the power transition modules. Two
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		power transition modules install from the rear of the chassis and plug into the midplane
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		opposite the power supplies in the front (see Figure 6 on page 13). The power transition
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		modules are provided for either AC or DC power sources, depending on how the chassis is
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		configured.
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•		The outputs of the AC and DC power transition modules are wired differently within the
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		midplane. An AC power transition module only supports the five power supplies within its
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		domain. However, because the outputs of each DC power transition module are wired
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		together along the midplane, each DC power transition module supplies power to all 10 DC
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		power supplies in the chassis.
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•		Full power redundancy consists of redundant power supplies, power transition modules, and
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		power sources. All G10 CMTS systems are shipped with two power transition modules
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		installed, one per domain, to implement power transition module redundancy. This also
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		facilitates power source redundancy. You must supply power from different circuits to each
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		power transition module to implement power source redundancy.
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•		Each AC module has a double-pole rocker switch that serves as a power switch for the
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		chassis. The switch is recessed to prevent accidental activation.
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•		The AC panel has a standard IEC 15-A receptacle with a three-prong male plug for connecting
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		to a power source. The DC panel has a 40-A terminal block with barrier guards for single lug
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		connections to the source and return.
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28 JUNOSg 3.0 G10 CMTS Hardware Guide