There are two types of Voip systems I have launched in the last few years. The plant powered system requires the broadband network to provide the 90v A/C for power the NIU ( network interface unit ) at the subscribers home via the coaxial drop. The A/C power is separated from the RF in the NIU and passed back out for the standard video and HSD services (there is still RF on the A/C power side to provide the RF carriers forward and return for the NIU). The NIU is most similar to a HSD modem, it is assigned an IP address by the network. The NIU interfaces to copper twisted pair for conventional telephone wiring and equipment in the subs home. The 90v A/C is the power required for the ringers and dial tone in standard phone equipment. This type of netowork is much more expensive and complex to operate, it is usually associated with a full upgraded plant using stanby powering and status monitoring that is necessary to provide 911 service to a customer. It always must have have power on the plant even during a power company outage.
The second type of system is what many of the smaller operators are attempting to launch, it cannot provide 911 phone service since it utilizes the subscribers electricity via a power transformer pack to gain the 90 volts required for the tone and ring. It will still utiize an NIU but the power is usually backfed on an RF coaxial drop or a separate coaxial from a 110 volt to 90 volt transformer plugged in inside the subscribers home. The NIU will still interface to the twisted pair like the previous system.
If you have any other major questions feel free to e-mail. (-REDACTED-)
Re: Voip
Member #: 31857
Registered: 7/17/2004
Posted:
7
Name:
John Zigler
Name:
John Zigler
Company:
Mediacom
Occupation:
Lead Technician
Location:
Seymour, MO
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