GAI-Tronics DEX-201 Manual - Página 9

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Auxiliary Devices

Terminal block TB1 is provided for connection of the speaker, system cable, footswitch, and beacon.
This terminal block accepts a #12-22 AWG wire. Refer to Table 2 for the recommended conductor sizes.
Conductor ends can be stripped and terminated with or without a wire ferrule.
Cable Use
Size
System
Digital: 2-conductor twisted pair, No. 22 AWG is typical
Analog: 4-conductor twisted pair (A/B twist; C/D twist), No. 22 AWG is typical
Power
3-conductor, No. 12 AWG is typical
Beacon
2-conductor, No. 18 AWG is typical (for digital models only)
Footswitch
2-conductor, No. 22 AWG is typical
Speaker Cable
2-conductor twisted pair, No. 18 AWG is typical
1. Install the system cable on TB1 system terminals A-D. Each system cable must be home run to the
Central. Digital stations require termination of a 2-conductor twisted pair cable on system terminals
A and B only. Analog stations require termination of a 4-conductor twisted pair cable (A/B twist &
C/D twist) on system terminals A-D. Refer to Table 3 for the maximum system cable lengths.
Cable Capacitance
30.5 nf/1000 feet
13.7 nf/1000 feet
2. Install the speaker cable on TB1 Speaker terminals LS1 and LS2. Refer to Table 2 for recommended
conductor sizes.
3. Install the beacon control cable on TB1 terminals C1 and C2. This control output is available on
digital stations only. Refer to Table 2 for recommended conductor sizes.
4. Install the footswitch cable on TB1 terminals N.O. and C. Refer to Table 2 for recommended
conductor sizes.
After all connections are made, inspect and clean the machined and threaded surfaces of both the
termination cover and box. Clean the surfaces by wiping with a clean, lint-free cloth. Apply a light coat
of Killark LUBG lubricant to the cover threads. Install and hand-tighten the cover to the box.
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Table 2. Recommended Cable Sizes
Table 3. Maximum System Cable Lengths
Digital Models
22 AWG
6562 feet
9843 feet
TATIONS
20 AWG
22 AWG
6562 feet
4921 feet
9843 feet
Pub.: 42004-679L2D
Page 8 of 13
Analog Models
20 AWG
6562 feet