External Speaker Unit (HESB) Options
Peripheral Installation
Strata DK40 I&M Manual Spring 1999
6-19
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
External Speaker Unit (HESB) Options
Strata DK40 system provides three options utilising an HESB:
◆ Loud Speaker Amplification
◆ Amplified Speaker
◆ Talkback Amplified Speaker
System hardware requirements vary depending on the HESB option selected. Refer to the
following installation procedures for the hardware requirements for each option.
Loud Speaker Amplification Option
The loud speaker amplification option enables the voice first or ringing signal tone to be
amplified without the use of other manufacturers’ equipment. The voice first and signal tone
can be amplified on all electronic and digital telephones equipped with HHEU PCBs and
HESB. (Refer to Chapter 5 – Station Apparatus.)
The HESB automatically turns OFF once the ringing call or voice first has been manually
answered from the electronic or digital telephone. This turn-off feature prevents audio
feedback problems.
Installing the HESB Loud Speaker Amplification in Digital Telephones
1. Connect a jumper between terminals 2 and 10 on the HESB TB1 terminal block
(Figure 6-11).
2. Connect a jumper between terminals 4 and 5 on the HESB TB2 terminal block.
3. Install an HHEU PCB and HESC-65A cable in the telephone per Chapter 5 – Station
Apparatus before proceeding with Step 4 for more information..
Note
HESB connections made in Steps 4~6 can be accomplished using the HESB VOICE
modular jack instead of the TB1 terminal block.
4. Connect terminal 1 of the HESB TB1 terminal block to the red (+) wire of the HESC-
65A using a modular block.
5. Connect terminal 2 of the HESB TB1 terminal block to the green (-) wire of the HESC-
65A using a modular block.
6. Connect terminal 8 of the HESB TB1 terminal block to the yellow (L2) wire of the
HESC-65A cable using a modular block.
7. Connect the customer supplied 12CDC power supply’s +12V lead to terminal 1 of the
HESB TB2 terminal block, and connect the power supply’s 0V lead to terminal 2.
8. Plug the provided power cord into the power supply and to a 240VAC, 50Hz power
source.
Important!
If AC voltage is not within range, have a qualified electrician correct the
problem.
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