User's Manual

Interwave Wave2000 BSS Specification Printed 11/21/02 12:29 PM
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8. Manual
The Microcell BSS is packaged in a standard 19 inch shelf, and can be integrated into the customers cabinet
or cell site. The microcell RF subsystem may be configured per specific requirements of the application, or
customer may choose to source this.
The microcell BSS is intended for high capacity and flexible power output applications. It is designed to
mount into standard 19 in telecom cabinets, and operates over temperature range of -20 to 50C. It has two
receive connections per radio, for main and diversity reception. A single transmit connection per is used.
The transmit output power at the radio is adjustable, but is in the 1 mW range. Radios are available for 800
MHz cellular (band 0) or 1900 MHz PCS (band 1) frequency operation. The microcell can support three
sectors, with extra hardware to support redundancy.
The microcell is designed to be cooled by an adjacent fan tray when operating above 40C. With fan tray,
the microcell is designed to operate at a maximum of 50C ambient temperature.
A fully populated microcell consists of the following cards:
(2) Micro Power Supply Circuit Card
(2) System Controller Circuit Card
(2) System Timing Circuit Card
(4) Channel Coder Circuit Card
(4) Radio Modules (PCS or cellular frequency)
(1) GPS receiver (mounted on rear of backplane)
The microcell is powered by DC voltage, between 20 to 35V. Power consumption varies with number of
cards, but a fully loaded microcell shelf consumes approximately 120W. Each card is packaged in
protective metal shielding, both to protect cards from ESD damage during handling and prevent unwanted
emissions from high speed circuitry. The exception is the micro power supply card, which needs air
circulation for testing, and does not contain sensitive, high frequency circuitry.
The system controller has multiple RF-45 interfaces. The upper two interfaces are currently unused, and
reserved for future functionality. The third R-J45 is a 10BT Ethernet port, used for dedicated connection to
network OA&M. It can also be used for diagnostic purposes during development. The lowest port is 100BT
Ethernet, and is the main network connection, carrying both signaling and data. As these are local, short
distance signaling, no high voltage protecting is needed or provided at these interfaces (as opposed to long
haul E1/T1 signals, which may be subjected to high voltage surges).
The system timing card has no front panel interfaces, but has several to rear via backplane. These are
described under backplane interfaces.
The channel card has no interfaces to the external world. It interfaces to a specific radio to the system
controller card via the backplane.