Mds opera 104 Installation & Operational Guide Special Note

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MDS Opera 104

Installation & Operational Guide

Special Note

The adhesive quick reference labels included with the Opera 104 system are intended as aids for use in conjunction with MF (tone) dial telephones with real time break recall only. Do not employ them when using non-MF dialling telephones. Where ‘R’ appears on the labels, a decadic ‘1’ will perform the same function.


This system is subject to legislation covering systems connected to the telephone network.

For this reason, and for your safety, please read this manual carefully before installing the OPERA 104 system.
Section Page

  1. System Description 3

1.1 Introduction 3

1.2 Description 3

2. Installation Instructions 4

    1. Warning 4

    2. Installation Procedure 4

3. Operation Guide 7

    1. Power Fail Operation 7

    2. To Make an Internal call 7

    3. To Make an External Call 7

    4. Incoming Calls 7

    5. To Terminate Any Call 7

    6. To Transfer a call 7

    7. To Confer and Transfer 8

    8. To Make an Enquiry Call 8

    9. Setting Do Not Disturb 8

    10. Clearing Do Not Disturb 8

    11. External Callback 8

    12. Internal Callback 9

    13. Setting an Extension as a Babyphone 9

    14. Listening to a Babyphone 9

    15. Note on ‘Hold’ Facility 9

4. System Specification 10

1. System Description
1.1 Introduction

The OPERA 104 operates as an advanced local exchange, or PABX, for four telephones and a single exchange line and provides features and facilities only found on much bigger systems.

1.2 Description

The OPERA 104 enables the four extensions to share the exchange line in an ordered and intelligent manner. Its basic facilities are as follows:

  • Any extension can access the exchange line and make a call.

  • Any extension can make an internal call to any other extension.

  • An incoming call rings at all free extensions and can be picked up at any extension.

  • While on an external call, as an extension can put the call on hold and make a private enquiry call.

It can then transfer the external call to the second extension or return to the external call in private.

2. Installation Instructions
2.1 Warning

  1. Please read this section in details before installing the OPERA 104 and adhere to the instructions

  2. The OPERA 104 is approved for connection to BT PSTN exchange lines with DTMF or LD signalling via the exchange line master socket.

No attempt should be made to connect to it other than using the modular plug provided.

If there is no exchange line master socket available on the premises then one must be fitted by British Telecom, Mercury Communications Limited or Kingston-upon-Hull Telephone Department.

  1. Removal of the access cover is all that is required to access the extension terminals during installation.

  2. Do not remove the three sealed screws on the base of the OPERA 104 as this invalidates the warranty and could expose you to dangerous voltages by removal of the top cover.

There are no user serviceable parts in the OPERA 104 other than fuse replacement which is located in the mains plug.

  1. Do not connect the OPERA 104 into the exchange line or the mains supply until stated in the installation procedure.

  2. Avoid mounting the OPERA 104 or the extension sockets on damp walls or in areas exposed to damp or condensation. Maintain at least 50mm clearance from main electrical outlets in all cases.

  3. Use approved cable for all extension wiring and fix all installation wiring every 300m.

2.2 Installation Procedure
The following is a step-by-step guide to the OPERA 104 installation.
Step 1 Decide on a location to wall mount the OPERA 104.

  • The location should have good ventilation and, where possible, be

secured against unauthorised access to the OPERA 104.

  • The location should be free from damp or condensation. Avoid installing the system in areas plumbed for water, kitchens, bathrooms etc.

  • A mains power socket should be provided within two metres of the OPERA 104.

Step 2 Wall mount the OPERA 104.

  • Loosen the access cover screw and lift off the access cover.

  • Position the OPERA 104 template on the wall and mark the positions of the three retaining screws. Use three No. 8 screws provided.

  • Drill holes for retaining screws and insert screw in positions 1. Hang the unit on the wall.

  • Secure the Opera 104 by inserting the remaining screws on either side within the access area (positions 2 and 3).

Step 3 Plan the extension telephone wiring

  • For each extension telephone, a master line jack is required into which you plug the telephone.

  • To connect the line jack to the OPERA 104, an appropriate length of two-wire cable is required. Use approved cable.

As there are restrictions on the maximum length of his cable to guarantee correct telephone operation, never exceed 46 Ohms which is equivalent to 250m of 0.5mm copper wire.

  • Never route extension wiring outside the premises as this could expose the OPERA 104 to hazardous voltages such as lightning.

  • If less than four extensions are being installed then always install Extension 2 first and then, subsequently, Extensions 3 and then 4.

Step 4 Install the extensions for each extension telephone

  • Wall mount the extension telephone Master socket.

  • Prepare the two wires of the cable and connect to the master socket.

  • Route the extension cable to the OPERA 104 system observing good building wiring practice by maintaining at least 50mm clearance between the extension cable and mains power, exchange line or other building cable.

  • Prepare the cable and connect the two wires to the appropriate two extension terminals on the OPERA 104.

The four pairs of extension terminals are located in the access area and marked in groups of two and Ext2, Ext3, Ext4, Ext5.
Step 5 Install the exchange line

  • Route the supplied exchange cable from the OPERA 104 to the exchange line connection point.

Step 6 Test the PABX power fail operation

  • Replace the access cover and secure the access cover screw.

  • Connect the OPERA 104 exchange line into the exchange line socket.

  • Plug a telephone into the Ext2 socket.

  • Make a local call from Ext2 and check for normal operation.

  • Arrange for someone to ring you and check for normal operation.

Step 7 Test the PABX with mains power

  • Plug telephones into all extension sockets.

  • Plug the OPERA 104 into the mains socket.

  • Lift each telephone handset in turn and check for continuous dial tone.

  • Make a call to each extension by dialling the extension number from another telephone and check that the telephone rings, i.e. to ring Ext3, dial 3 from any telephone.

  • Have the calls answered and check speech path.

  • From each extension in turn dial ‘9’. Wait for exchange dial tone and make a local call.

  • Arrange for an incoming call and check that it rings at each free extension telephone.

Pick up the handset at a ringing telephone and check that you receive the incoming call.

Note: It is possible to connect a combination of DTMF and loop disconnect

telephones to the OPERA 104 when operating out of a digital

telephone exchange which accepts both loop disconnect and

multi-frequency signalling. Please note however that the OPERA 104 learns the type of signalling used at each extension. It is therefore necessary to power down the OPERA 104 when changing the type of telephone used at any extension.

3. Operation Guide
This section details the operation of the OPERA 104.
3.1 Power Fail Operation

In the even of a mains power failure, the OPERA 104 will allow normal operation of the Ext2 telephone only.

3.2 To Make an Internal Call

- Lift the extension telephone handset.

- Listen for dial tone.

- Dial required extension number e.g. dial 2, 3, 4 or 5.

- Listen for ring tone.

- Wait for answer.

3.3 To Make an External Call

- Lift the extension telephone handset.

- Listen for dial tone.

- Dial ‘9’ (outside line)

- Listen for exchange dial tone.

- Dial required directory number.

Note: Do not wait more than eight seconds between subsequent digits when


3.4 Incoming Calls

To answer, lift the handset at a ringing extension telephone

If you are on an internal call at the time then you will hear the alert tone instead of the telephone ringing, just replace your handset and the telephone will ring.
3.5 To Terminate any Call

Simply replace the handset to terminate any call.

3.6 To Transfer a Call

- Press the register recall button (or dial decadic digit ‘1’), this puts the external line on hold

- Listen for dial tone.

- Dial required extension number e.g. dial 2, 3, 4 or 5.

- Listen for ring tone.

- Replace your handset to transfer call.

- The call will ring for 30 seconds at the extension and, if not answered, it will

ring back at your extension for 10 seconds. If not answered at your extension, it the ring for 3 minutes at Extension 2 before clearing down.

3.7 To Confer and Transfer

- Register recall (or dial decadic digit ‘1’)

- Listen for dial tone.

- Dial required extension number e.g. dial 2, 3, 4 or 5.

- Listen for ring tone.

- Wait for the call to be answered. Confer.

- If extension accepts the call, replace your handset to transfer.
Note 1: Internal calls between two extensions cannot be transferred to a third


Note 2: With outgoing calls, wait at least 8 seconds after dialling the last digit of the number before transferring.
3.8 Make an Enquiry Call

If you want to make a private enquiry call to another extension when on an external call, proceed as follows:

- Register recall (or dial decadic digit ‘1’)

- Listen for dial tone

- Dial the required extension number e.g. 2, 3, 4 or 5.

- Listen for ring tone.

- When extension answers, make enquiry.

- To conclude the enquiry and return to the external call, register recall (Or dial

decadic digit ‘1’).

    1. Setting ‘Do Not Disturb’

If you do not wish incoming calls to ring at your extension but still want to receive internal calls, proceed as follows:
- Lift your handset

- Dial ‘00’

- Listen for dial tone

- Replace handset.

Special dial tone will be heard at your telephone each time you lift your handset as a reminder.
3.10 Clearing ‘Do Not Disturb’
- Lift your handset

- Dial ‘00’

- Listen for dial tone

- Replace handset

Normal dial tone will be returned.

    1. External Callback (Call Back When Free Line)

If you try to access the outside line and it is busy then you can book the line:

- Register recall (or dial decadic digit ‘1’)

- Listen for dial tone

- Replace handset

When both the exchange line and your extension are free, then:

- Your telephone will ring

- Lift your handset

- You are now automatically on the line and can dial the required number (there

is no need for the access ‘9’)

3.12 Internal Callback (Call back When Free Extension)

If you make an internal call and the extension is busy then you can book a call to

that extension.

- Register recall (or dial decadic digit ‘1’)

- Listen for dial tone

- Replace handset

When both your extension and the booked extension are free, then:

- Your telephone will ring

- Lift your handset

- The booked extension will ring automatically.

Note: You can set up an internal callback to only one extension at a time from

each extension..

3.13 Setting an Extension as a Babyphone

Any extension may be used as a babyphone so that other extensions may be used

to monitor a sleeping baby.

- Lift the handset of the phone which will be used as the babyphone.

- Dial its own extension number.

- Place the handset close to the bed or cot of the baby

To restore to a normal extension, replace handset.
3.14 Listening to a babyphone

The babyphone may be monitored from any extension:

- Lift the handset

- Dial the babyphone extension number.

- You will be connected to the babyphone.

- Replace the handset to return your telephone to normal operation

Note: Only one extension at a time can listen to the babyphone.
3.15 Note on ‘Hold’ Facility

During an external call transfer or during an internal enquiry call (see page 8), the external call is placed on hold.

Please note that the approval of this hold facility does not guarantee its satisfactory performance under all operating conditions.
4. System Specification

Capacity 1 Exchange Line

4 Extensions

Telephones Loop disconnect or multi-frequency telephones

Exchange Line Loop disconnect or multi-frequency lines

Extension Ports The extension ports within the OPERA 104 are

suitable for connection to apparatus complying with

BS6301 and are labelled:



Only simple telephone/apparatus approved for direct

connection to the PSTN and which:

a) have connection arrangements that comply with

BS6317, Clause 3;

  1. are of correct signalling type;

should be connected.
Under no circumstances must connection be made between BS6301 marked ports and other ports.
Extension Sockets Connect the extension phones to the extension cables via master line jack sockets.
Series DC Voltage Drop 2.0 VDC at 40mA DC

(extension to exchange) (with 46 Ohm extension line length).

Internal System Tones

Dial Tone Continuous

Diverted Dial Tone 1.75 sec on, 0.1 sec off

Ring Tone 1 sec on, 2 sec off

Busy Tone 0.5 sec on, 0.5 sec off

Alert Tone 0.2 sec on, 2.5 sec off
Mains Supply Connection

Power 240 Vac +/-10%


6 Watts

The mains lead wires are coloured in accordance with the following code.

Blue : Neutral

Brown : Live
As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals of your plug, proceed as follows:
Wire Colour Plug Terminal

Blue N or Blue or Black

Brown L or Brown or Red
Use a BS1362 approved plug.

Fit a 3amp approved fuse in the plug.

REN (Ring Equivalence Number)

The REN of a BT line is 4 which means that a maximum of four telephones of apparatus with a REN of 1 could be connected in parallel.

The REN of the OPERA 104 exchange port is 1 which means that 3 telephones of REN 1 could be connected in parallel.
The OPERA 104 extension ports have a total REN of 1 which means that only telephones with a REN of 1 or less should be connected to the extensions.
If a telephone is connected in parallel with the OPERA 104 exchange line, then:

‘During dialling, the OPERA 104 may tinkle the bells in the other telephones sharing the same line. This is not a fault and we advise you not to call the Fault Repair Service.’

Note: The OPERA 104 is not suitable as an extension to a payphone.
Numbering Plan
Intercom Calls Dial

To Extension 2 2

To Extension 3 3

To Extension 4 4

To Extension 5 5

Exchange Line Access 9

Do Not Disturb On/Off 00

Setting Babyphone Own Extension Number

Ring When Free (when engaged) ‘1’ or recall

Enquiry (while on external call) 1,…Extension Number or

Recall, Extension Number

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