4.4 Function Description (for Advanced Users)

Purpose of Section

The purpose of this section is to help technicians solve problems, if any. If the system fails to work properly and a well-trained technician monitoring its operation step by step according to the description included herein gets to a point where the description and reality are in contradiction, he or she describes the contradiction, thus facilitating troubleshooting. This procedure often reveals that the system works properly but the user had a different idea of how to use it.

Outgoing Call

The process starts whenever the ALARM button is pressed on any audio unit. (in the lift cabin audio units, the CANCEL input may delay or block calling, refer to parameter 914). After the ALARM button is pressed, the LN, LN establishes connection with the dispatching office (for details see the Automatic dialling section). The LN replays a message identifying the LN and the calling audio unit, as well as the following instruction for the dispatching centre: "Press 1 for confirmation". The received call has to be confirmed manually or automatically. The call is time-limited (by the "Attention, the call is ending" message), but can be prolonged.

For (DTMF) control during a call see the Dispatching Centre Instructions subsection.

Machine Room Call

You can call any audio unit in one LN system from the machine room (i.e. from the machine room audio unit, item no. 913611, to which a telephone set is connected). Furthermore, you can activate functions and program LN parameters with the machine room audio unit. To activate the machine room audio unit, pick up the attached telephone. Using the TRIPHONY button you can get through to the other audio units of the same lift (however, if the machine room audio unit is shared by multiple lifts, triphony is activated in the first lift only).

Machine room voice menu

Triphony

Triphony provides interconnection of audio units. This mode can be activated by pressing the TRIPHONY button in the machine room (see the preceding subsection), in the lift shaft or on the lift cabin roof (audio units No. 913612E).

This mode features a different setting of the automatic HandsFree mode. The microphones of active audio units are less sensitive than those operating in the ALARM mode.

Triphony terminating options

• Machine room telephone hang-up;
• TRIPHONY button repressing;
• Timeout expiration;
• Giving priority to incoming or alarm calls.

Checking Call

The checking call is an automatically generated outgoing call, typically established every 3 days. The purpose of the checking call is to supervise the system function. Typically, this call is processed automatically in the dispatching office.

Incoming Call

The dispatching office may call back to LN. The CU receives any incoming call automatically, identifies itself and offers a voice menu (DISA). This helps the caller to access the required audio unit. Like outgoing calls, incoming calls are time-limited and easily controlled (prolongation, end).

If the operator calls back and wants to get connected to the audio unit from which the preceding call was made, enter 0 in the voice menu. 

Call Sequencing

If another request arises during communication, the calls are queued. Calls have different priorities – alarm calls have the highest one. Therefore, the alarm call suspends any lower-priority call (the checking call, e.g.). Calls with identical priorities are queued and processed one after another. Having done that, LN recovers the suspended activity if possible.  

Explanatory notes:

na = not applicable

ns= cannot be served

Q= to be queued

S= current activity suspended

Automatic Dialling of Multiple Numbers with Confirmation

Up to 6 telephone numbers including repetitions can be stored for dispatching office calling. LN then tries to call all the numbers stored. To confirm successful calls, LN uses tone dialling (DTMF). Having received a call manually, the dispatching office officer has to press the button on his or her telephone (tone dialling). If the called line is busy, or is unanswered within a timeout, or the call is not confirmed, LN dials the numbers in the sequence until it exhausts all pre-set attempts. The procedure is the same for checking calls or failure reports but a separate group of six numbers can be used.

Evaluation of Situations during Automatic Audible Dialling with Confirmation

Automatic Redialling of Multiple Numbers without Confirmation

This mode is useful where no trained personnel for automatic dialling with confirmation are available. The called party does not have to press any button. The two modes share a set of numbers, have an identical count of cycles, respond to the busy tone in the same way, etc.

The only difference is that the no-confirmation mode waits for the ringing tone and recognises that the called party has answered when the ringing tone terminates before the timeout end and that the connection has been made successfully.

In this mode, LN does not repeat the "Wait please" message (or any user-recorded message) after the dialling end, because it would be impossible to recognise ringing reliably. The message is played back once shortly after the called party answers. The message speaker cannot be controlled using buttons  to . 
 

Evaluation of Situations during Automatic Audible Dialling without Confirmation

Automatic Call Receiving

If equipped with a PC with the 2N^® LiftManager application, the dispatching centre receives calls automatically. It identifies the calling lifts and types of calls (alarm, checking, and automatic failure report). The checking calls are served fully automatically. The alarm calls are transferred to the operator, who uses the above mentioned commands in this case too.

Survey of Messages

Call End (Outgoing / Incoming Calls)

A call is terminated (line hang-up occurs) if any of the following cases happens:

• The busy or continuous tone has been detected*) (call end on PBXs).
• Timeout for call confirmation expired (see parameter 913 setting)
• The pre-programmed maximum call duration has elapsed – the "Attention, the call is ending" message is played back 10 seconds before the call end, the call can be prolonged using .
• The character  or  has been received.
• The timeout expired during programming.
• A higher-priority call request.

*)The communicator is able to detect the continuous, busy and ringing tones even if the tone has two frequency components, which is the case of Great Britain, USA (so-called BTT tone) and Canada. To set the dual tone characteristics, set parameters 946 and 947.

Use of Switches

Every machine room audio unit is equipped with a switch, which enables to block the lift function in case LN fails to call for help in the event of:

• telephone line failure;
• power outage and back-up battery discharge.

The switch is provided with a normally closed (NC) contact and executes the required function automatically.