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4.2
Performance Specification
The total round-trip delay for the voice path, including the delay in the BSC, is less than 220 ms. A suggested
delay budget for the reverse link path and the forward link path is as follows:
Reverse Link
Mobile Station
Air Link
Digital Unit
Backhaul/Switching
TSB
Vocoder
Total
The Pico BTS is capable of physically supporting up to 32 channel elements, including all of the overhead
channels.
4.3
Electrical Performance
The Pico BTS shall have much less RF output power than the BTS for macro-cell. The maximum CDMA
power does not exceed 10 watts at the antenna port on the enclosure over all temperature range.
4.3.2.1 Primary Power
The primary power source (or mains) for the Pico BTS is the commercial power which can be acquired very
easily. The nominal voltage may be 120VAC, 60Hz, single phase. The power subsystem in the Pico BTS is
capable of converting this commercial AC power into DC power with nominal voltage of +48V. The +48 DC
is then converted into lower voltages such as +5V , +12V, -12V , +3.3V and +7.5V to be used in each
subsystem.
The AC input ranges and the maximum power source requirement are as follows:
Table 4.3.2-1 Primary Power AC Input Voltage Range Requirement
Nominal Voltage
120VAC
220VAC
Table 4.3.2-2 Maximum Primary Power Output Requirement
Voltage
DC +48 V
4.3.2.2 Battery Backup Power (Optional)
The Pico BTS shall have battery backup to cope with AC power failure. The battery shall be monitored during
normal operation, and charged if necessary. The Optional backup battery is provided with an external
compartment.
Configuration
Nominal RF Power 5 watt
Rev: 1.0
Table 4.2.1-1 Base Station Delay Budget
Delay (ms)
Forward Link
51
Mobile Station
20
Air Link
18
Digital Unit
6
1
3
Vocoder
99
Total
Voltage Range
108 to 132 VAC
198 to 242 VAC
Current
Max 10 A
Table 4.3.2-3 Battery Power Requirement
DC Current/Power
5 Amps/240 VA
Hyundai Electronics Confidential Proprietary
15
Delay (ms)
18
20
2
CIN
8
TSB
1
49
98
Frequency Range
54 to 66 Hz
54 to 66Hz
Phases
single
single
Comme nts
For RF power 8 watts
Comme nts
up to 4 Hours backup
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