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GDK-20W DIGITAL WIRELESS KEY TELEPHONE SYSTEM
59
Base Station Cabling
The Base Station is connected to the WTI(wireless terminal interface) ports of GDK-20W KSU by a twisted one pair
copper line. The following rules should be obeyed:
The cable for connecting the KSU with a base station should be a twisted pair cable.
The cable for connecting the KSU with a base station shall be separately cabled. This connection shall be cabled
separate to the building cabling using one pair CAT5 cabling.
Twisted pair shielded cables should be used with all outdoor configurations.
The following characteristics should be observed for all cables:
DC resistance: The resistance of a conductor should not exceed 73.4 ohm per km for a temperature of 20 degree.
Attenuation: The attenuation of any pair should not exceed 17 dB per km on condition of a temperature of 20 degree and
frequency of 1 MHz.
Characteristic impedance: Characteristic impedance should remain in the range of 100 ohm _ 15% for a frequency of 1
MHz.
Crosstalk: The total crosstalk of any pair (Far-end and Near-end crosstalk), measured over a line length of 1800 metres
should not exceed 40 mV.
The maximum connection length depends upon cable size(φ). [Table 3.6.4] shows the resistance and the maximum cable
length.
Cable Type Resistance Maximum Cable Length
0.4 mm cable (Awg26)
0.27 Ω/m
150m
0.5 mm cable (Awg24)
0.18 Ω/m
300m
0.6 mm cable (Awg22)
0.11 Ω/m
450m
[Table 3.6.4] Cable Resistance and Maximum Cable Length
Wireless Terminal Installation
To install GDC-335H (GAP) and GDC-340H (GAP), simply take out the handset and batteries (330-SBP,
rechargeable battery), charger (330-SSC, 340-SSC) and AC/DC adapter (330-HAP) from the package and
assemble it. Before using the GDC-335H and GDC-340H, you should recharge the battery fully.
After inserting a battery, press the power button of GDC-335H (GAP) and GDC-340H (GAP). Figure 3.6.20
shows the initial LCD. The two icons in the left upside of the LCD are blinking until the GDC-335H is
subscribed. (In GDC-340H, these icons are not displayed until the GDC-340H is subscribed)
R S
BS
T
.
UY
Figure 3.6.20 LCD Message of Unsubscribed GDC-335H (GAP) and GDC-340H(GAP)
Before using the GDC-335H(GAP) and GDC-340H(GAP), it should be subscribed. Figure 3.6.21 shows the
LCD message of the subscribed GDC-335H(GAP) and GDC-340H(GAP).
S T
A
XXX
Figure 3.6.21 LCD Message of Subscribed GDC-335H (GAP) and GDC-340H (GAP)
Refer to the User Guide of the GDC -335H and GDC-340H for the detail information.