Chapter 5: C4c CMTS Installation Requirements
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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Power Requirements
The C4c CMTS uses dual redundant power feeds to supply electrical power to the system. The system is capable of
operating from a single feed in case one of the feeds fails. The supply voltage can be either DC or AC. The C4c CMTS must
be connected to a protected power source. The system consumes a maximum of 1200W of power for DC voltage and
1350W maximum for AC voltage.
The operating range for 115Vac is 100 to 240 Vac, 47 to 63 Hz. The system will shut down if the voltage is outside of these
limits.
When operating on -44VDC and using 1200W, the C4c CMTS draws a maximum of 27.3A. Circuit breakers on the power
feeds should be sized accordingly. The Power Modules in the C4c CMTS will limit the startup current to prevent false
tripping of the circuit breakers.
Cooling Requirements
The C4c CMTS should be installed in a location with adequate ventilation. It is designed for long-term operation at ambient
air temperatures ranging from 41-104°F (5-40°C) and an area that is between 5 to 85 percent relative humidity, non-
condensing.
To determine cooling requirements, assume 1350W for worst-case power dissipation. These values assume the worst-case
cooling requirements when the maximum number of CAMs (6) is used.
The C4c CMTS draws cooling air in through the right side of the unit (when facing the front of the chassis) and expels it out
the left side of the unit. Clear airflow must be maintained to ensure adequate ventilation. A closed unit rack assembly is
not recommended.
CAUTION: As with all electrical equipment, operation at excessive temperature accelerates the deterioration of
components and adversely effects performance. Prevent excessive heat buildup in the rack.
Temperature Monitoring
The C4c CMTS monitors module temperatures at approximately 90-second intervals. If the temperature of a front module
falls below, or rises above its operating range, a TempOutOfRangeNotification SNMP trap is generated for that module. If