ADC AGBB User Manual
Interwave Wave2000 BSS Specification Printed 11/21/02 12:29 PM
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.
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Interwave Wave2000 BSS Specification Printed 11/21/02 12:29 PM
Each radio has 3 coax interfaces at the front panel. The upper and lower coax port are for dual receive
inputs, while the center is for transmit. Each radio module is designed to support a specific frequency band.
Current versions available support the 800 MHz (cellular) and 1900 MHz (PCS) bands. Each radio
interfaces to a channel card via the backplane.
The micro power supply card generates all voltages for the shelf, using the 20 to 35VDC input. The primary
voltage used by all cards is 6.5VDC. The power supply also generates 12VDC for the GPS module, and 3.3
VDC as bias for Ethernet transformers on backplane.
The backplane has 14 slots for the front mounted cards. Slots are keyed using card mounted grounding pins,
to prevent improper insertion of card types.
At rear of backplane are several connectors as follows:
Microcell Power: 10 pin, requires voltage between 20 to 35 VDC. Diode protected against accidental
reverse voltage.
Microcell enable: 2 pin, when shorted together will enable microcell power supply. Will be disabled when
open circuit. This is intended to connect to an external alarm control unit, which monitors ambient
conditions to ensure microcell is operated only within recommended temperature and voltage ranges.
Alarm Control Port: DB9 port for RS-232 connection to external alarm control unit.
2PPS: coax, used to output pulse per two seconds used for RF receiver measurement with
external test equipment.
GPS Port: DB9 port for RS-232 connection to GPS receiver.
GPS Power: 2 pin, provides 12VDC for GPS unit.
GPS 10M: coax, used to receive 10 MHz frequency reference from GPS unit.
GPS 1PPS: coax, used to receive 1 pulse pre second signal from GPS unit.
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Interwave Wave2000 BSS Specification Printed 11/21/02 12:29 PM
GPS
Antenna
ALARM
CONTROL UNIT
FAN TRAY
I/O A
+24VDC -24VDC
RS-232 PWR
-
+
Fuse
+ -
TEMPERATURE
HUMIDITY
SENSOR
..........
..........
..........
I/O A
TERMINAL
WIRING
BOX
BTS RACK
ANTENNA
COMBINER UNIT
MULTICARRIER
AMPLIFIER
GPS
RS-232
+ -
GPS
PWR
DIV
ANT
10MHz
RF
IN
RF
OUT
1PPS
TO MPCA
INPUT
GPS
Receiver
FROM MPCA
OUTPUT
ACU
RS-232
PP2S
MAIN
ANT
ENABLE
POWER
+ -
RACK
-
+
+
-
+
+
RACK
1 --- ALARMS -- 12
POSITIVE POWER RAIL (+)
POWER
SUPPLY
POWER
CONNECTOR
NEGATIVE POWER RAIL (-)
AC
.....
.....
......
........
Figure 10 - An Example of a BSS Telecom Equipment Solution (Viewed from Back)
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