|Majorpower Inverters Deployed in Cable Head-End Upgrade
The cable industry is deeply involved in a technology shift for power conversion
configurations as it introduces telephony services to their customers. A cable
company implementing a head-end upgrade realized that the shift in power
architecture could not only support the new equipment, but also benefit the
reliability and cost of the entire site.Traditional cable head-end sites are designed with alternating current (AC)
backup utilizing a single 150,000 VA UPS. The new telephony equipment
installation is direct-current (DC) powered and requires the addition of a
large DC power system with stationary battery strings to achieve multiple hours
of run-time. The network planning engineer realized that by moving the
critical AC loads to the DC system he could increase reliability and reduce
annual maintenance expense.
The Majorsine Power Inverter was implemented to supply the power to the
equipment from the DC system. This configuration allowed for reduction in capacity of the UPS and created annual
The most critical AC powered infrastructure in the system is the
forward and return optics equipment supporting customer traffic.
Each optical transport device is equipped with a redundant AC power
supply to mitigate possible input power failures.
By setting up an A-side & B–side configuration using two
Majorsine inverters, the optical transport equipment redundant AC
supplies are supported for multiple hours on battery during
long-term utility outages. In addition, the Majorsine integrated
static by-pass increases the system reliability because during
anomalies of primary DC loss the inverter will switch the optical
equipment to the alternate AC power source.
The implementation of the Majorsine Power Inverter to support the
critical loads allows the cable company to significantly reduce its
recurring maintenance contract expense while enhancing the
reliability of the network.