STC MX5 USER INSTRUCTIONS


CONTENTS
Introduction
Installation
Connecting Telephones to the MX5
MX5 Extensions Facilities
External Line Failure
Cleaning Instructions
Ringer Equivalents Number (REN)
Restrictions on Using the MX5

IMPORTANT
Ensure that you read and understand this guide thoroughly before attempting to operate the MX5.

INTRODUCTION
MX5 is a small telephone system intended for use in the home, office or small commercial business.
It serves up to five internal telephone extensions From one direct exchange (DEL) line, connected to the Public Switched Telephone Network (PSTN), without the need for an operator.

A number of special features, normally available in large expensive systems are provided.

These include:
Intercom between extensions.
Incoming Call Intercept.
Call Hold for Enquiry or Transfer.
Conference Calls.
Remote Transfer.
Do Not Disturb.
Repeat Last Number.
External Call Barring.
Power Fail Operation.

INSTALLATION
MX5 is intended for connection to public switched telecommunications systems run by British Telecommunications plc or by Kingston-upon-Hull City Council.

The MX5 must be installed by an approved installer. There are no user accessible parts.

Each telephone extension used with the MX5 should be plugged into its own MASTER extension
socket which in tern is connected to the control box using approved cable. Extension 1 should be used for the prime telephone.

The MX5 should be hard wired to the DEL using approved cable.

Only Direct Exchange Lines using the loop calling/disconnect clearing signalling system (10 pulses per second) are suitable. The Multi-Frequency (MF) signalling method is unsuitable.

IMPORTANT - Connection of AC Mains: 240V, AC, 50Hz
The wires in the mains lead are coloured in accordance with the following code:
Blue - Neutral
Brown - Live

Connect the wires in the lead to a plug approved to BS1363 as follows:
Wire - Colour Plug Terminal
Blue - N or Black or Blue
Brown - L or Red or Brown

Fit a 3 Amp fuse in the plug or adapter or at the distribution board. The apparatus consumes 35 watts maximum. Always ensure that the apparatus is disconnected from the mains before removing cover.

CONNECTING TELEPHONES TO THE MX5
Extension telephones must he connected to the system via their own MASTER socket.

Installers Note:
Only Loop Disconnect (LD) type telephones are suitable for use with the MX5. Multi Frequency (MF) types will not function correctly.

The maximum telephone REN number For any one extension is 1.5.

The PEN number of the PSTN interface port of the MX5 is 3.

For a definition of REN and its application to the MX5 system refer later pages of this guide.

The maximum cable length allowed between the DEL terminating point and the MX5 connection is S metres. The maximum coble length allowed between the MX5 extension connector arid the extension line jack socket is 200 metres.

IMPORTANT
The MX5 is not approved far extensions to he wired external to the premises containing the control box, as the wiring may be subject to lighting or other surges, for which protection is not supplied.

MX5 EXTENSION FACILITIES
To make an Internal Call
To make on External Call
Emergency Calls
To set up Priority Phone (Call Intercept)
To cancel Call intercept
To set up Do Not Disturb
To release On External Call on hold
To make an Enquiry Call
To cancel an Enquiry Call
To set up a Conference Call
To cancel a Conference Call
To set up a Redial Last Number 2Ci 6

POWER FAIL MODE OF OPERATION
In the event of a mains power failure, MX5 will allow normal operation of the prime
phone only (extension 1).

TO MAKE AN INTERNAL CALL
Lift handset
Listen for internal dial tone (this is a distinctive two tone note).
Key or dial required extension number (extension numbers 1-5).
Listen for ring tone: this is an interrupted version of the internal dial tone).
NB. If the called extension is busy you will hear the engaged tone which is an interrupted single note.
Make call.
Replace handset.

TO MAKE AN EXTERNAL CALL
Lift handset.
Listen for internal dial tone. (This is a continuous two-tone note)
Key or dial 9.
Listen for normal exchange dial tone.
Key or dial required number.
N.B. If you hear the number engaged tone - try again later.
Make call.
Replace handset.

In the event of hearing a number unobtainable tone (a continuous note) when making or external call, 
this may mean that your particular extension is barred from making such a call.

EMERGENCY CALLS
Lift handset.
Listen for internal dial tone. (A continuous two-tone note)
Key or dial 9
Listen for normal exchange dial tone.
Key or dial 999
Make call.
Rep1ace handset.
Emergency calls may be made from any extension even if "call barred".
If a power failure occurs use extension 1 only (Key or dial 999 only)

RECEIVING AN INCOMING CALL FROM THE PUBLIC EXCHANGE
Incoming calls from the public exchange will ring extension numbers 1-5.

However, not al1 the phones will ring at once, the sequence is:
Extension numbers 1 and 3 will ring simultaneously; then
Extension numbers 2 and 4 will ring simultaneously; then
Extension 5 will ring.

The whole sequence will he repeated until the call is answered. Picking up any of the: extension telephones will answer the call. The above sequence may be modified by either of the following methods described in the following pages.

RECEIVING INCOMING PUBLIC EXCHANGE CALLS - EXTENSIONS BUSY
When an incoming call arrives whilst extension 1 is busy on an intercom call, a warning (intrusion) tone will he heard on both extension 1 and the connected extension. The tone sounds similar to ring tone but only one note is heard. The tone will slop as soon as another extension answers the call. If the call remains unanswered either extension 1 or the other connected extension should be used to terminate the intercom coil and to pick up the call by:
Press hook/switch ONCE.
Release hook/switch.

CALL INTERCEPT
If you wish to intercept all incoming calls from the the public exchange to your exchange i.e. priority phone simply dial your own extension number. All incoming calls will then ring your extension only. However, your extension is engaged when an incoming call arrives, then all other extensions will ring in the normal way.

To set up Call Intercept (Priority Phone)
Lift Handset.
Listen for internal dial tone.
Key or dial own extension number.
Listen for confirmation tone.
Replace handset.

To cancel Call Intercept
Lift handset of any extension.
Listen for dial dial tone.
Key or dial 7.
Listen for confirmation tone which is an alternating two-tone note separated by a period of silence.
Replace handset.

To set up Do Not Disturb
Any or all of extensions 2-5 may set up to prevent  ringing of that extension.
Lift handset of appropriate extension phone.
Listen for internal dial tone. (A continuous two tone note)
Key or dial 0.
Listen for confirmation tone which is an alternating two tone note separated by a period of silence.
Replace handset.

Ringing is now disabled for both internal and external calls.

To cancel Do Not Disturb
Lift handset of appropriate extension phone.
Replace handset.

TO HOLD AN EXTERNAL CALL
When an incoming or a incoming call has been established through the public exchange it is possible to hold the call to enable enquiry calls to he made or to transfer the call:
Key or Dial 6.

N.B. On outgoing calls, wait 10 seconds after dialling the last digit before attempting to hold the call.

TO RELEASE AN EXTERNAL CALL ON HOLD
Key or dial 6.

TO MAKE AN ENQUIRY CALL
During an established public exchange call:
Key or dial 6.
Listen for internal dial tonic.
Key or dial required extension.
Make call.

TO CANCEL AN ENQUIRY CALL
Key or dial 6.

Return to the exchange call, even if enquiry extension is busy or unobtainable.

TO TRANSFER A CALL
You are connected to on exchange call arid wish to transfer that call.
Key on dial 6.
Listen for internal dial tone. (A continuous two tone note)
Key or dial required extension number,
When the extension: is answered - to return to the exchange call - Key or dial 6.
Replace handset.

The exchange call is automatically transferred.

If the extension is not answered, or is busy or unobtainable, return to the exchange call - key or dial 6.

TO SET UP A REMOTE TRANSFER CALL
You are connected to an exchange call and wish to remote transfer that call:
Key or dial 6.
Key or dial required extension number.
Listen for ring tone.
Replace handset.

This action causes the dialled extension number, to ring for up to two minutes after your handset has been replaced. IF the dialled extension answers within two minutes the outside call will be automatically transferred.

After two minutes the remote transfer call will “clear down”. If, within two minutes, you lift your extension before the remote transfer call has been answered, the exchange call will be reconnected to your extension again arid the remote extension will stop ringing.

TO SET UP A CONFERENCE CALL
You are connected to an exchange call and you wish to include one other extension in the call by setting up the conference facility.

Key an dial 6.
Key or dial the required extension number.

When the extension is answered.
Key or dial 2.

The three party conference call is now set up.

TO CANCEL A CONFERENCE CALL
As originator of the conference call you have control of the conference,

You may:
Key or dial 6.

You have now disconnected the third party and can continue with the outside call.  The third party will not hear the internal dial tone.

You may now use another facility;
or
Either internal extension can terminate the conference call by replacing their handset. The remaining extension will remain connected to the exchange line and will retain full control of the hold, transfer and conferencing facilities;
or
If both internal extensions in a conference call cleared down by replacing their handsets, the outside line will also be cleared down.

TO SET UP REDIAL LAST NUMBER
If your extension was the last to make an outside call, you may redial that last number:
Key or dial 8.

If you hear the number obtainable tone this means that an a outside call has been made from another  extension and your number has been overwritten.
Key or dial number in full.

EXTERNAL LINE FAILURE
In the unlikely event of being unable to obtain an external line, the following procedure must be carried out: Switch off the mains supply to the MX5 for at least 10 seconds. Switch on the mains  supply to see if the fault 1ias cleared, if not take the following action:

  1. Switch off the mains supply to the MX5.
  2. Using Extension 1, access the exchange line, if exchange line is still unobtainable, test with nay other extension telephone plugged into extension 1.
  3. If exchange line is obtained (external dial tone) your first telephone is presumed faulty. (the procedure may be tested with all extension telephones,)
  4. If no external line is obtainable then contact British Telecom.
  5. If the exchange line is obtainable contact your distributor.

CLEANING INSTRUCTION
Do not spray aerosol polish into the vents.
Do not use abrasive cleaners.
Do use a damp doth, if necessary

RINGER EQUIVALENCE NUMBER (REN)
The number of telephones and other telecommunications apparatus which may be connected in parallel to a British Telecom DEL is limited by the total REN  number of the equipment concerned.  The REN value for a BT line is 4 which signifies that a maximum four telephones with a REN of 1  could be connected to the same exchange line and still ring correctly.

Since the REN of the MX5 is 3 this permits only one attachment of REN 1 in parallel with the DEL connected to the MX5. This, for example, could be an approved tone caller or a telephone.

WARNING
If a telephone of REN 1 is connected in parallel with the MX5 Del, note the following:

During dialling, this apparatus may tinkle the bells in other telephones sharing the same line. This is not a fault and we advise you do not call the Fault Repair Service.

However, should a telephone be connected it will by-pass all the facilities provided by the MX5 and is therefore not recommended.

RESTRICTIONS IN USING THE MX5
WARNING
This apparatus is not suitable us an extension to a Payphone.

The extension ports within the MX5 control box are marked with the following:

“WARNING: CONNECT ONLY APPARATUS COMPLYING WITH BS6301 TO THESE PORTS”

Interconnection directly or by way of other apparatus not so marked may produce hazardous conditions on the BT network and advice should be obtained from a competent engineer before such a connection is made.

Note: Apparatus displaying the Green approval label complies with the above requirements.


Last revised: July 02, 2005