User's Manual

NC-2200 Installation Guide

P/N 900.0007 Proprietary and Confidential

3 Equipment Description

3.1 Major Subsystems

Several major subsystems are integrated in NC-2200. The major subsystems are listed here with a brief description of each.

• Uninterruptible Power Supply (UPS). The UPS is a 1500VA unit which is used to power all of the equipment

within the cabinet. An essential feature of the UPS is a serial communications protocol which allows the NC-2200

Network Controller computer to detect when the system is operating on battery power and when the battery power

source is near the low voltage limit. This allows the Network Controller to do a graceful shutdown of the system.

• Network Controller Computer. The Network Controller computer is an industrial 2U rack mount computer. The

computer has no rotating media. It uses a flash drive to store the database and configuration. The computer uses an

Ethernet interface to communicate over a TCP/IP link to the Network Server. The Network Server is typically

located in the utility operations center. The computer communicates with the RF Control Shelf and the UPS via RS-

232 serial connections.

• Fan assembly. The fan assembly is a cross flow / tangential fan which draws air through the louvered front door,

blows up through the Control Shelf and exhausts through the rear louvered door.

• Controller Shelf. The Controller Shelf is the heart of the 220MHz base station radio. The Controller Shelf includes

a Reference Card and one each Controller Card, Transmitter Card and Receiver for a single channel.

• Power Supply. The power supply shelf supplies 8V and 15V D.C. power to the Controller Shelf.

• Power Amplifier. The Power Amplifier is fed from the Transmitter Card in the Controller Shelf and delivers the

RF output power to the duplexer transmitter port.

• Duplexer. The duplexer is a band-pass, band-reject series of cavity filters which allows for the sharing of a single

antenna for both transmit and receive with full-duplex operation. The antenna is connected to the duplexer antenna

port through a lightning surge arrestor.

• LNA & Splitter Panel. The LNA (low noise amplifier) provides pre-amplification of the received signal before it is

delivered to the Receiver Card. The splitter allows the receive signal from the LNA to be distributed to additional

channels allowing for future expansion.

• Receiver Filter. An additional receiver cavity filter is provided for protection of the receiver from harmful

interference.

• Network Power Bar. The Network Power Bar allows Tantalus to remotely control the power to any of the

subsystems in the cabinet. The Network Power Bar has password protected access and is used for remote technical

support.

• Ethernet switch. The 5 port Ethernet switch is provided to allow the Network Controller computer and Network

Power Bar to share one physical Ethernet connection to the cabinet. In addition it allows for the connection of a

laptop for access to the system for local support.