Equipment
Distance
CS and PS
More than 1 m (3 ft 3 in)
Each CS
More than 3 m (10 ft)
Each PS
More than 0.5 m (1 ft 8 in)
PBX and CS
More than 2 m (6 ft 7 in)
If multiple CSs cover the same area, the phone connection may become noisy or the number of possible
simultaneous calls with PSs may decrease due to interference between the CSs. For details, refer to "5 Site
Survey—Testing the Radio Signal Strength".
The required distance between CSs may vary depending on the environment of the installation site and
conditions in which the wireless system is used. Conduct a site survey to determine the appropriate distance.
RF Specification
Item
Description
Radio Access Method
MultiCarrier TDMA-TDD
Frequency Band
1920 MHz to 1930 MHz
Number of Carriers
5
Carrier Spacing
1728 kHz
Bit Rate
1152 kbps
Carrier Multiplex
TDMA, 24 (Tx12, Rx12) slots per frame
Frame Length
10 ms
Modulation Scheme
GFSK
Roll-off factor=0.5 50 % roll-off in the transmitter
Data Coding for Modulator
Differential Coding
Voice CODEC
32 kbps ADPCM (CCITT G.726)
CAUTION
•
The CS should be kept free of dust, moisture, high temperature (more than 40 °C [104 °F]), low
temperature (less than 0 °C [32 °F]), and vibration, and should not be exposed to direct sunlight.
•
The CS should not be placed outdoors (use indoors).
•
The CS should not be placed near high-voltage equipment.
•
The CS should not be placed on a metal object.
Document Version 2009-12
Quick Installation Guide
9
1 Overview
