User's Manual

Exhibit 8
Page 3 of 3 FCC ID: MIJZEPCPE-USB-01
12/30/99
Additionally, the ODU provides a serial communication interface to a personal computer attached through
the PCU. The personal computer is used for service or ODU equipment programming, it is not required
for normal operation.
The ODU interfaces to the Indoor Unit through the Power Control Unit using a single coaxial cable
connection. Upstream IF, Downstream IF, Power supply voltage and the serial communication interface
to the ODU are multiplexed over the coaxial cable connection.
The transceiver will typically be located outdoors and must operate in various harsh environments.
8.2.2 Zephyr Firmware
The Zephyr ODU contains a microcontroller. The microcontroller executes embedded firmware to
manage transceiver functions. The Zephyr firmware is reprogrammable through the serial communication
interface.
8.2.3 Zephyr Power Control Unit (PCU)
The Zephyr PCU performs several functions:
1. The PCU converts line voltage to the DC supply voltage required to power the ODU.
2. The PCU combines the DC supply voltage with the Indoor Unit IF interface for input to the ODU
via the IF interface.
3. The PCU provides a MODEM function to allow a PC to interface to the ODU via the IF
interface.
The Power Control Unit is located indoors. As such, its operating environment is benign.
8.2.4 Zephyr Radio Service Software
Radio Service Software is a PC application program that communicates with the ODU via the serial
communication interface. The application program provides a user interface to download firmware,
reprogram/read radio configuration data and determine rudimentary health status.
Radio Service Software is to be used by Maintenance/Repair Depots and Service Provider technicians, it
is not to be made available to equipment end users.
8.3 Zephyr Subsystem Requirements
This section defines requirements for the combination of the Zephyr components.
8.3.1 Interoperability
The Zephyr subsystem is one system element of the overall LMDS system. As such, it is required to
interoperate with other system elements.
8.3.1.1 Hub and Router
The Zephyr Subsystem shall operate with the Motorola DOCSIS compatible Cable Router and the
Millitech B Band Headend Sector Unit.
8.3.1.2 DOCSIS MODEM
The Zephyr Subsystem shall operate with DOCSIS compatible cable MODEMs.