Required Distances between Equipment
Maintain the distances listed below between equipment in order to prevent noise, interference or the
disconnection of a conversation. (The distance may vary depending on the environment.)
Equipment Distance
CS and office equipment such as a computer, telex, fax
machine, etc.
More than 2 m
CS and PS More than 1 m
Each CS More than 3 m
Each PS More than 0.5 m
PBX and CS More than 2 m
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 "2.10.5 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)
Transmission Output Peak 0.12 W
CAUTION
• The CS should be kept free of dust, moisture, high temperature (more than 40 °C), low temperature
(less than 0 °C), 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.
212 Installation Manual
2.10.1 Overview
