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DEX-10

DEX-20

ODEL

X AND

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.

f:\standard ioms - current release\42004 instr. manuals\42004-679l2d.doc

10/10

RILLER

NTERCOM

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