GOLDSTAR GCX-408-816 Service Manual
GOLDSTAR GSX408/816 http://www.britishtelephones.com/goldstar/gsx408.ht
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The GSX-408/816 Key Telephone System is designed to meet the telecommunications needs of small to
medium sized businesses.
The Key Service Unit (KSU) is a wall mountable unit that contains Key Service Board, Power Supply,
Battery Backup Unit, Real Time Clock Unit and pre-wired connectors for station and CO line interfaces.
The GSX-408/816 is a flat pack system equipped with 4 CO lines and 8 Stations. It can be easily
expanded to 8 CO lines and 16 stations with a modular PCB mounted in the KSU.
Crane Telecommunications are the sole importer of these systems into the UK. Goldstar UK have nothing
to do with them what so ever. Installation manuals are scarce due the fact Crane Telecommunications
operated maintenance contracts on the systems and were reluctant to let the owners carry out their own
re-programming. If the system is second-hand you will have trouble getting any support for it at all.
Y2K Compliant.
The GSX-408/816 Key Telephone system is a microprocessor controlled, solid state electronic switching
system which distributes communications in a non-blocking format. All control, switching interface
circuitry is condensed onto a single printed circuit board (PCB) located inside the key service unit.
Switching is accomplished through a solid state crosspoint matrix that provides voice path connections for
4 (8) central offices lines, 8 (16) key telephones and 8 intercom paths.
The CO interfaces are equipped with transformer barriers for system classification as an FCC fully
protected system. Each CO circuit supports rotary or DTMF dialing under software control. The DTMF
tones and system supervisory tones are generated in each keyset.
The central microprocessor is a Z-80 and controls the crosspoints and central office relays. It also controls
communications between slave microprocessor located in each GSX key telephone.
The 408/816 contains all system memory, which is composed of 96K of Read Only Memory (ROM) and
16K of Random Access Memory (RAM). The RAM is sub-divided so that part is used for customer
database. A long life lithium battery protects the customer database memory. The system general
memory (ROM) is contained in a Program Module (PM) that is interfaced to the KSU through a modular
connecting arrangement. This allows easy access for removal of system software when upgrading
software feature packages.
Each key telephone contains a microprocessor and circuitry to monitor button activity and control lamp
conditions. A built-in speaker permits voice or tone calling to the station. Every telephone has a flexible
button field, which can be individually programmed for 1 to 6 functions.
The key telephone sets are equipped with 9 fixed function buttons and either 12 or 24 flexible buttons
which can be programmed by individual users, 2 volume controls an intercom mode selection switch and
integrated speaker.
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For emergency applications, a stand-alone battery assembly may be connected to the battery-input
terminals on the KSU. This retains system power in the event of commercial power failure.
8 CO (Outside) Lines
8 Intercom Channels
16 Key Telephone Stations
1 External Music Source Input
1 External Paging port
2
Loud Be ll C on trols
1 Alarm Input (NOT BURGLAR ALARMS!)
1 24V DC Battery Connector
OPTIONAL
1 RS232C Port for SMDR
KEY SERVICE UNIT
The KSU is a self-contained unit that contains the power
supply, processor, external connectors and circuits for 4
CO lines and 8 stations. External connections use 50way
Telco connectors. A plug in module provides systemoperating data in standard and advanced feature package.
The system is provided with a real time clock to provide
executive telephones with LCD, to have time and date
displayed, and a battery to keep clock accurate in case of
commercial power failure. This unit also provides SMDR
to track date and time.
KEY TELEPHONE
The 4-button telephone comes with 4 fixed feature buttons.
1 volume control and message waiting lamp.
The 8 button has the same size wit 4-button telephone but comes with 2 fixed feature buttons, 6
programmable buttons, 1 volume control and message waiting lamp.
The 21-button telephone comes in 2 models, Enhanced and Executive. Both models come with 9 fixed
feature buttons, 12 programmable buttons, speakerphone, 2 volume controls, and intercom mode selection
switch. In addition, the Executive model comes with a 2-line, 48-character LCD display.
The 33 button is similar to the 21-button but comes with 24 programmable buttons. Is also available in
enhanced and executive style.
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4 Button Key Telephone 21 Button Key Telephone
PHONE BOX
The unit is basically a wall-mounted unit that is used for door-opening facilities. The system can handle a
maximum of 8 of these units.
SINGLE LINE ADAPTOR
This unit (shown pictured to the right) is for converting connection
that would be intended for a key telephone and convert the signals
so that a normal POTS telephone can attached to the system i.e.
modem, answer phone etc. etc.
KEY SERVICE UNIT
Height 419mm
Width 298mm
Depth 76mm
Weight 8KG
KEY TELEPHONE
Height 222mm
Width 222mm
Depth 70mm
Weight 1.5KG
PHONE BOX
Height 44mm
Width 140mm
Depth 102mm
Weight 0.5KG
EXPANSION MODULE
Height 279mm
Width 140mm
Depth 25mm
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