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