GHX-308A/616
HYBRID KEY TELEPHONE SYSTEM
Http://suryawardana.com
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3.14 EXTERNAL PAGING CONNECTION
External paging amplifier equipment can be connected to the GHX-308A system for external paging from any telephone.
The output impedance of the paging signal port is 600 ohm at 0 dBm.
The voice signal output is specified at 5mW maximum. Regular electrical specification of the relay is 120VAC 500mA
(24V DC 1A). For external paging contact control, the free relay (FR #T/#R) is provided to switch the external amplifier
equipment. The voice output is provided the E.PAGE T/R pair on the MBU. See [Figure 3-8] Miscellaneous Wiring.
3.15 BACKGROUND MUSIC AND MUSIC ON HOLD
Music-On-Hold as well as background music through telephone speaker can be connected to either KSU contained
music(Melody IC) or via a customer provided tuner, tape deck, etc., by setting music select pin of connector “CN225” on
the MBU.
When the system is shipped, the music select pin is set to internal music(Melody IC) at the factory. If you want to
connect external audio equipment, the music select pin of “CN225” should be moved “INT” to “EXT” - external music
position. See [Figure 3-8] Miscellaneous Wiring.
T R
T R
1T 1R 2T 2R
E.PAGE MOH
FR
Input Impedance
600ohm
Amplifier
External Music
Source
Ringer
Customer Provided
Power control of ext. amplifier
DC Voltage Source
Note) E. PAGE : External Paging Port
FR : Free Relay Port
MOH : Music On Hold Port
[Figure 3-8] MISCELLANEOUS WIRING
3.16 HEADSET INSTALLATION
The Key Telephone has been designed to operate with industry standard modular headset adapters and operator
headsets. To modify a key telephone to support an external headset, plug the headset adapter cord into handset jack on
the key telephone base. Plug the telephone handset cord into the headset adapter box where indicated by the headset
manu-facturer’s instructions.
In the Admin program FLASH 40, speakerphone operation must be disabled to allow headset operation. When this is
done, such features as On-Hook Dialing and Handsfree speakerphone operation are rendered inoperable. However,
incoming page/voice announcements, tone ringing and background music will still be heard over the keyset speaker.
The monitor key(MON) then controls the on-hook or off-hook status of the telephones.