Glensound Electronics ISDN GSGC6 User manual

GGLENSOUND ELECTRONICS LTD Tel: [phone]
6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE ENGLAND [phone]
Visit our Website at www.glensound.co.uk Fax: [phone]

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GGLENSOUND ELECTRONICS LTD
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Date 03/07/97 File AP06-145 Issue 9
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GSGC6 & GSGC7
ISDN MIXER & CONTROLLER
PRODUCT DETAILS
GENERAL (Pink Sheets)
Approvals AP72-02
General Information AP72-03
GSGC6 (White Sheets)
Front & Rear Views A2-12822
Block Diagram A3-12821
Installation AP72-04
Audio I/P & O/P Circuit Diagram A2-12902
PSU Circuit Diagram A3-12823
Connector Pin-Outs AP40-48 (2 Pages)
The GSGC6 Command Language AP72-01(12 Pages)
Specification AP72-07
GSGC7 (Yellow Sheets)
General & Installation Information AP72-05
GSGC7 Front View A4-12866
Operating Instructions AP72-06 (5 Pages)

File AP72-02
APPROVALS
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CE
Both the GSGC6 and GSGC7 conform to the requirements of EMC DIRECTIVE 89/336/EEC
Emissions StandardsEN 50081-1
Immunity StandardsEN 50082-1
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BABT APPROVAL REQUIREMENTS FOR THE UNITED KINGDOM
The GSGC6 incorporates a Dataflex Design ISDN Basic Rate Module which has been approved
by the British Approvals Board for Telecommunication (BABT) for connection to the Integrated
Services Digital Network (ISDN). The following approval number has been given to this
product:
NS/3010/5/P/603977
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NET 3 APPROVAL
The GSGC6 is fully approved for use as a digital terminal adapter on any PSTN using a basic
rate access interface compatible with CCITT I.420 (NET3).
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BRIDGING CTR APPROVAL
The terminal adaptor used in this unit is the Dataflex IM90C module. This module has bridging
CTR approval so that the GSGC6 units are approved for use in any country in the EEC
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File AP72-03 issue 3
GENERAL INFORMATION
GSGC6
This unit is a 1U subrack designed to provide ISDN facilities in a studio, it contains a
terminal adapter, a mains power supply, some control electronics and space for 1 or 2 codec
type cards.
The terminal. adapter is a 'Dataflex' IM90 module. This is a twin unit capable of dealing with
both B channels of an ISDN 2 circuit at the same time. If the GSGC6 is fitted with 2 codec
cards it can be considered as two completely independent units. These are known as PORT 1
and PORT 2. The front panel (See drawing number A2-12822) has LEDs to show the state of
port 1 and port 2.
There are three ways of controlling a GSGC6:-
First, it is possible to use the unit with very little extra equipment. The GSGC6 can be
set to auto-answer incoming calls. It is also possible to store two numbers, one in port
1 and one in port port 2. Either number will be automatically dialled if the
corresponding DC loop is made on a rear panel connector
Second, it is possible to remote control it from a computer terminal using the 2 off
RS232 connectors fitted on the rear panel. The command language used, is listed later
in this book.
Finally we manufacture a dedicated controller type GSGC7 .
GSGC7
This unit has been specifically developed to control the GSGC6. Our drawing number A4-
12866 shows the general facilities. It would normally be positioned in a studio control room
and remote control the GSGC6 which would be located in an apparatus room.
Used to originate and answer calls , it contains a dial, a display, and some LEDs. These LEDs
indicate the state of the ISDN line and the Codec
Up to 30 ISDN numbers can be held in non volatile store. These can be given names as well
as numbers to help the operator.
If the GSGC6 is fitted with two codecs, it is preferable to have two GSGC7s. These can then
be used simultaneously in two different studios producing two totally independent
programmes.

File AP72-04 iss 4
GSGC6 INSTALLATION
GENERAL
The GSGC6 is a 1U subrack designed to be fitted in an equipment rack or apparatus room.
Although there are some indicators and 3 controls on the front panel, it is not necessary to
access these.
MAINS
An IEC mains connector with a retaining clip is provided on the rear panel. The mains earth
is internally connected to the metalwork. A terminal binding post is also provided adjacent to
the mains connector to permit additional earth bonding.
ISDN CONNECTION
Connection to the ISDN2 S bus is via a standard RJ45 socket. A 3 metre lead is provided with
the GSGC6. If a longer lead is required or an extension is fitted to the ISDN2 point be very
sure to use only cables to the correct specification.
AUDIO
Audio circuits are balanced zero level on 3pin XLRS. The inputs are fixed sockets and the
outputs are fixed plugs. Maximum digital code is sent with a +14dBu signal. The GSGC6
does not contain a limiter so any input greater than +14dBu will be clipped by the digital
system. It is worth noting that digitally clipped signals can often upset the codec at the other
end of the circuit. This is particularly true for G722 codecs with statistical frame locking. It is
therefore good practise to ensure that the levels sent to the GSGC6 do not exceed +14dBu.
CONTROL
Control of the GSGC6 can be from a computer system or from our dedicated controllers type
GSGC7. The control ports are RS232 type ports on a 9 pin D fixed sockets wired to the IBM
PC standard. A separate control port is provided for each codec position.
DC LOOPS
A further 15pin D fixed plug is provided for each port. These provide various loop closures
and can be used to operate lamps or other studio equipment. In addition switches can be fitted
in the studio to:- 1)send a programmable DTMF tone 2) 'Hang Up' the terminal adapter 3) dial
a previously stored ISDN number.
AUX DATA
When the GSGC6 is fitted with an MPEG Codec an extra 9 pin D fixed socket is fitted. This
is the Aux Data connector and provides an RS232 type data path to a similarly equipped
codec at the other end of the ISDN circuit. It operates at a fixed 9600 baud and is compatible
with some other manufacturers codecs.
CODECS
The GSGC6 will normally be fitted with the codecs as ordered with the equipment. It is
however simple to add or change the codecs. This can be done by removing the top cover of
the GSGC6. The codecs are mounted one above the other and are connected to the main PCB
via 60pin IDC leads. The lower codec is connected to port 1 and the upper codec is connected
to port 2.

GLENSOUND ELECTRONICS LTD
WIRING INFORMATION FOR GSGC6 1U ISDN TA/CODEC
NOTES 1) V = VARICON. D = D CONN. X = XLR. P = FIXED PLUG. S = FIXED SOCKET
2) TW = TWISTED WIRES, TP = TWISTED PAIR, SP = SCREENED PAIR, SS = SINGLE SCREENED WIRE
File Number AP40-48 Page 1 of 2 Date 18/06/96 Issue Number 4
CONN
No
TYPE FUNCTION WIRED TO TYPE COLOURS
1&3 X3S Audio Inputs Main PCB GSJ78
Pin 1 = Ground
Pin 2 = In Phase
Pin 3 = Mate
2&4 X3P Audio Outputs Main PCB GSJ78
Pin 1 = Ground
Pin 2 = In Phase
Pin 3 = Mate
5D15P DC Loops Port 1 Printed Down GSJ78
Pin 1 = +12v Aux Power Out
Pins 2,9 = I/P LOOP Send DTMF 1
Pins 3,10 = I/P LOOP Hang Up
Pins 4,11 = I/P LOOP Dial Stored No.
Pins 5,12 = O/P LOOP- DTMF Rcvd
Pins 6,13 = O/P LOOP- 2sec Pulse
when Framed
Pins 7,14 = O/P LOOP- Codec Framed
Pins 8,15 = O/P LOOP- TA Locked
6D9S RS232 Control Port 1 (IBM PC Std) Printed Down GSJ78
Pin 1 = Carrier Detect (o/p)
Pin 2 = Receive Data (o/p)
Pin 3 = Transmit Data (i/p)
Pin 4 = Data Term Ready (i/p)
Pin 5 = Ground
Pin 6 = Data Set Ready (o/p)
Pin 7 = Request to Send (i/p)
Pin 8 = Clear to Send (o/p)
Pin 9 = Ring Indicator (o/p)
7D15P DC Loops Port 2 Printed Down GSJ78
Pin 1 = +12v Aux Power Out
Pins 2,9 = I/P LOOP Send DTMF 1
Pins 3,10 = I/P LOOP Hang Up
Pins 4,11 = I/P LOOP Dial Stored No.
Pins 5,12 = O/P LOOP- DTMF Rcvd
Pins 6,13 = O/P LOOP- 2sec Pulse
when Framed
Pins 7,14 = O/P LOOP- Codec Framed
Pins 8,15 = O/P LOOP- TA Locked
8D9S RS232 Control Port 2 (IBM PC Std) Printed Down GSJ78
Pin 1 = Carrier Detect (o/p)
Pin 2 = Receive Data (o/p)
Pin 3 = Transmit Data (i/p)
Pin 4 = Data Term Ready (i/p)
Pin 5 = Ground
Pin 6 = Data Set Ready (o/p)
Pin 7 = Request to Send (i/p)
Pin 8 = Clear to Send (o/p)
Pin 9 = Ring Indicator (o/p)