Ovrrbu-bts. Pdf

AirLink 8000
1/30/00
BASE TRANSCEIVER STATION
Release 1.00
2 - 32
1.17 SPECIFICATIONS
1.17.1 Characteristics
Frequency Plan
Currently available:
2.1 -2.3 GHz, 2.5 - 2.7 GHz, 3.4 –3.7 GHz, and 2.0 – 2.3 GHz
Multiple Access 
Method
Bi-directional Synchronous Code Division Multiple Access
Modulation Scheme
128 level QAM/QPSK, differential encoding/decoding, Direct Sequence 
Spread Spectrum (DSSS)
Traffic Capacity
119 voice channels per 3.584 MHz carrier
Traffic Concentration
Operator definable, up to 25:1 concentration 
Users/RBU
Users/DSCO
2500 voice channels
10,000 (15 RBUs)
Nominal Power
14 dBm/channel in each direction; normally 35 dBm from RBU
Power Control
None from RBU to SU; 
Closed Loop for SU to RBU - 50 dB in steps of ±0.25 dB
SU Antenna
RBU Antenna
18 dB
i c
gain, 22° 3dB beamwidth
Omni - RH
cp
with 8 dB
i c
max. gain or Sectored with 11-15 dB
ic
gain
SU Receiver
RBU Receiver
-114 dBm sensitivity, -50 dBm max. input sensitivity, 6dB noise figure
-114 dBm sensitivity, -30 dBm max. input
Dial Tone Delay
Less than 0.5s under non-blocking conditions
Propagation Delay
RBU to SU under 6ms
Bit Error Rate
Less than 10
-6
when received input power is more than -111 dBm
Security
Pseudo-random Noise encoding (2.72 Mc/s per user) with randomizing, Full 
encryption for over the air network control channels
Subscriber Services
32 kbps voice (ITU-T ADPCM)
64 kbps fax and modem (dynamic rate change from 32 kbps)
64 – 256 kbps data (ITU-T X.21 leased line service)
ISDN BRI (2B+D)
32 kbps Payphone support (battery reversal, 12/16 kHz metering)
Priority Calling
Outbound (line side) for up to five pre-set emergency numbers
Inbound (network side) for local fire, police, EMS, VIP, etc.
Leased line service (permanent virtual circuits)

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