OneBase™ Cell Extender Model: OBE-DB-X Operation Instruction December 20, 2006 Version. 1.
Introduction: The OneBase™ Cell Extender subrack is a high-power, mixed-mode RF front-end equipment solution which provides signal amplification and conditioning for both uplink and downlink cellular base station signals. It is a highly modular design, consisting of a minimal set of unique field-replaceable units, capable of being configured and scaled for a variety of system level capacities and air interfaces including TDMA, GSM/EDGE, CDMA, WCDMA and analog air interfaces.
Functional Blocks: The OneBase™ Cell Extender subrack is comprised of the following functional blocks: − − − − − − RFIM (Radio Frequency Interface Module): MCPAs (Multi-carrier Power Amplifiers—850 MHz or 1900 MHz) SCM (Switch Combiner Module) Filter Module (850 MHz or 1900 MHz) PDP (Power Distribution Panel) Inputs and Outputs Inputs and Outputs: The amplifier is powered from a DC supply voltage which can range from 20VDC-to30VDC (with a nominal voltage of 27 VDC).
System Pictures: Front View Rear View Andrew Corporation – Base Station Systems Group Proprietary – Use pursuant to Company Instruction Page 3
Alarm System: Alarms and operating state are communicated to the BTS via connections to the “Alarm Terminal Block” at the back of the subrack. The terminal block is internally connected to dry-contact relays which are located in the MCPA subracks. ALARM CATEGORY SEVERITY Minor Conditions that do not immediately affect system operation, but lead to more serious problems if ignored. Major Conditions that directly affect amplifier operation (e.g. reduced gain), but allow the system to continue operating.
RFIM LEDs RFIM LED Status Green: “ON” Yellow: “ON” Red: “ON” Alarm Severity Initial Power-up of MCPAs. Green: “ON” Yellow: “FLASHING” Booting or remote loading of RFIM Firmware NONE Green: “ON” Normal Operation NONE Green: “ON” Yellow: “ON” Minor Green: “ON” Red: “FLASHING” Major Green: “ON” Red: “ON” Critical Possible Failure Modes NONE 1. RFIM internal temperature high (over approximately 75°C) 2. “Minor” failure from one or more MCPAs as follows: a. MCPA Fan(s) failure b.
Installation and Operation Set-Up Each OneBase™Cell Extender subrack is specifically designed for a specific cellular system by using the correct combination of components and the correct electrical wiring and RF cabling of these components. The components of the OneBase™Cell Extender subrack are electrically connected with a combination of blind mate rear connections and front panel connections to optimize flexibility and ease of maintenance.
programmability of the device shall only be made available to service depots and agents of the equipment supplier and NOT to the public. 4. Exposure of Humans to RF Field : The equipment conforms to RSS-102. RF Exposure compliance is also addressed at the time of licensing. 5. Multi-carrier operation : Rated output power of the equipment is for multi-carrier operation, which is 426 Watts maximum total composite. For multiple carriers, the total output power is distributed as required for each RF carrier.
