Product Description

General function, construction and units
DN991444 © Nokia Corporation Draft 47 (98)
Issue 3-0 en Draft Nokia Proprietary and Confidential
• Q1int-bus, which is used for local transmission management.
• Q1-bus, which is used for external equipment management.
• F-bus, which is used for data transfer and signalling between TRX units.
•I
2
C-bus (cabinet management bus), which handles the alarm and control
signalling between passive units (all units except for transmission units).
Physically, the buses are located on the BTS backplane.
Base control functions
The Nokia MetroSite EDGE Base Station does not have a separate plug-in unit
for base control functions (BCF) because one of the TRXs is configured as the
master TRX of the BTS. Currently, the master TRX is always located in TRX slot
1 (the lower left TRX slot, next to the transmission unit and interface unit slots).
The following tasks are handled by the master TRX:
• BTS control
• Message delivery to the BSC
• Alarm handling
• Timing functions
• Software downloading
• Self-testing of the BTS
Power distribution
The electrical power (AC or DC) from the external power source is distributed
within the Nokia MetroSite EDGE Base Station by the BTS’s power supply unit.
The power supply unit distributes DC power to the plug-in units. All electrical
connections are conveyed via the backplane. For information on the output
voltages, refer to Section 6.6.2.
The power supply unit is capable of feeding power to the maximum BTS
configuration which includes either two Nokia MetroHopper Radio outdoor units
or two Nokia FlexiHopper Microwave Radio outdoor units.