User's Manual

Exhibit 8
Page 2 of 2 FCC ID: MIJZEPCPE-USB-01
12/30/99
In order to communicate with the Outdoor Unit to perform service or installation tasks, a serial
communication path is provided from the ODU through the PCU to an attached personal computer. The
PC executes an application program known as Radio Service Software. Based on operator selections, the
PC can query the ODU to determine health status, configuration, etc.
The Zephyr Product is a major portion of the subscriber CPE as indicated by the dashed line in
Figure 8.2-1. The Zephyr Subsystem contains the following components:
1. Zephyr ODU
2. Zephyr Firmware
3. Zephyr Power Control Unit (PCU)
4. Zephyr Radio Service Software
Zephyr
Outdoor
Unit
(ODU)
Headend
or
Repeater
Indoor
Unit
Bias-T
Power
Control
Unit
(PCU)
Zephyr
Firmware
PC Application:
Radio Service
Software
Zephyr Subsystem Contained in Dashed Line
Serial Com Intfac
User
Data
I/O
(Cable
MODEM)
AC Line
Power
Interface
PCU/IDU
IF
Figure 8.2-1
ODU /PCU
IF
PC Required
for
Maintenance/
Service Only,
not required
for normal
operation
8.2.1 Zephyr Outdoor Unit ODU
The Zephyr ODU is a microwave transceiver, it performs two primary functions:
1. The ODU up converts the upstream IF generated by the Indoor Unit for over the air transmission to
the LMDS Hub.
2. The ODU down converts over the air signals transmitted by the LMDS Hub to a receive IF and
outputs the signal to the Indoor Unit for demodulation and data recovery.