2.1 PSTN/GSM/UMTS/VoIP Central Unit

Description


Central Unit


Indication Elements
Signal strength




greenstrong signal
yellowmedium signal
redweak signal
no lightin case of IP/PSTN
According to mobile network (valid for modules with LTE/VoIP):
2Glight on
3Gfast flashing
4Gslow flashing

The signal can flicker between the individual bands (strong – medium, medium – weak).


Valid for modules without LTE:
External linegreenline is all right and ready
green flashing call in progress
yellowline is all right but registered in ROAMING
yellow flashing (quickly)data transmission
yellow flashing (long 3 s)SMS in progress data – sending/receiving
yellow – greencall and data at the same time (only GSM/UMTS version)
red flashing (slowly)SIM not inserted
red flashing (quickly)incorrect PIN, last attempt
red permanently illuminated
  • SIM inserted but not registered
  • fault in PSTN
  • VoIP not registered

Valid for modules with LTE:

Internal bus




Relax state:
Green, light on4G + VoLTE available (IMS active)
Yellow, light onVoLTE unavailable and VoIP also inactive
Yellow – green (1 s – 1 s)active VoIP, i.e. SIP and 4G registration active at the same time
Call:
Green, flashing (1 s – 1 s)VoLTE
Yellow, flashing (1 s – 1 s)2G/3G voice channel
Green – yellow – no light (0.5 s – 0.5 s – 1 s)VoIP
Call:
Green, flashing (1 s – 1 s)VoLTE
Yellow, flashing (1 s – 1 s)2G/3G voice channel
Green - yellow - no light  (0.5 s – 0.5 s – 1 s)VoIP
Error states:
Red, slow flashing (1 s – 1 s)SIM not inserted
Red, fast flashing (0.5 s – 0.5 s – 0.5 s – 0.5 s )Wrong PIN
Red, light onCall cannot be set up / device does not work as configured (e.g. unregistered module, SIP, etc.)
Power/batterygreenpower OK, battery is charged
green flashingbattery charging
yellowpower failure, battery in operation
yellow flashingless than 1 hour battery operation
redbattery disconnected
red flashingbattery defected – replace
Systemgreencore OK
green flashingsystem is launching (other LEDs start to flash)
yellowbootloader launching
yellow flashingupgrade underway
red
  • HW activation (immediately after switching on)
  • error in core (logs can be downloaded)
red flashingHW must go for servicing (it is impossible to download logs and the bootloader has a fault)
green – red
  • checking call error
  • invalid configuration
  • system file missing


 

Central Unit Connectors


There are a USB connector and reset button to the right of the CU (see the figure below).


USB Connector and Reset Button



Reset Button Function

  • Reset equipment – press the button quickly.
  • Restore factory values – press and hold the button until all the LEDs turn red. Then release the button and wait until the SYSTEM LED flashes yellow. Now press the button quickly to delete all the user settings.
  • Zero backup rechargeable battery life counter – press and hold the button until all the LEDs turn red. Then release the button and wait until the POWER/BATTERY LED flashes yellow. Now press the button quickly. Perform this function after replacing the backup rechargeable batteries with new ones only!
  • Check system completeness – press and hold the button until all the LEDs turn red. Then release the button and wait until the INTERNAL BUS LED flashes yellow. Now press the button quickly to make the system supervise all the installed equipment (splitters, Audio Units etc.) for proper connection and function. Refer to S. 4.8.
  • Delete central unit software completely – press and hold the button until all the LEDs turn red. Then release the button and wait until the SYSTEM LED flashes red. Now press the button quickly. CAUTION: after performing this function you can only restore the normal function of the device using a PC!

Warning

  • After the CU SW is deleted, value 13 (equivalent to 13A h) is set in parameter 600 Capacity of accumulator regardless of the type of batteries. Adjust this value manually according to the battery type to make the charging procedure correct. 


USB Port Connection

Recommendation

  • Do not keep your PC connected for a long time unless necessary to reduce the computer damage due voltage surge from the telephone line during storms, for example. 

Before You Start

CU Installation Conditions

  • The Central Unit (hereinafter referred to as CU) is not intended for outdoor use.
  • Do not install the CU onto vibration-producing machines.
  • Install the CU vertically to allow air flow for cooling purposes (never cover the CU with any cloth or install it in another closed box).
  • You may install the CU into the lift switchboard unless the temperature exceeds the acceptable limit. Remember that a higher ambient temperature reduces the life of backup rechargeable batteries in the CU.
  • It is recommended that the CU should be operated in the upright position with the cable openings at the bottom. Such mounting position ensures the lowest temperatures and thus the longest life of the rechargeable batteries. Horizontal mounting is also possible. The upright position with the cable openings at the top (upside down) is forbidden!
  • After mounting the CU check that the equipment is firmly fixed in place and cannot come loose and drop down into the shaft.

Product Completeness Check

Check whether the product package is complete before installation:

  • 1 central unit
  • 1 main bus terminal
  • 4 bus connection terminals
  • 4 wall plugs
  • 4 wall plug screws 
  • 8 cable ties
  • 1 battery connecting cables
  • 1 brief manual 
  • 1 warranty sheet
  • drilling template

CU Mounting

It is recommended to install the CU in a room that is secured against unauthorised persons, such as the lift machine room, switching station etc. On an easily accessible place there is a risk of telephone line misuse or SIM card misappropriation.

The CU is mounted on a wall with the included wall plugs and screws.

Caution

  • The CU is designed for multi-shaft building installations and cannot be shared by multiple buildings. 


 

CU Electrical Installation

Putting in Operation

  1. Keep the CU disconnected from the mains.
  2. Loosen the three screws on the upper cover of the CU.
  3. Move the upper cover of the CU in such a way that you can remove it.
  4. When removing the cover, proceed with caution, be careful about the earth wire connecting the cover with the CU bottom part. Do not disconnect the wire unless there is a reason to do so!
  5. Using the slide-on terminals supplied with the device, connect the Audio Units, splitters (if there are 2 and more lift shafts) and other components of the system with the CU. Adhere to polarity!
  6. Install a PSTN, GSM or UMTS module unless installed on the CU. Abide by the instructions given in the Instructions for Use of the given module (refer to Subs. 2.7 or 2.8).
  7. Connect an analogue telephone line to the PSTN module if used (use a telephone connector or the terminal board on the module). Do not forget to connect an antenna to the GSM/UMTS module is used and insert a SIM card!
  8. Take the rechargeable batteries out of the package and place them into the CU as instructed. Fix them into the holder and use an 8 mm spanner for tightening. Interconnect the batteries using the included cables but do not connect them to the CU yet.
  9. Connect the CU power cable to a 230 V socket.
  10. Interconnect the battery cables with the CU motherboard.
  11. Replace the upper cover on the CU and tighten the cover fitting screws. Doing so make sure that the earthing wire is connected to the cover!

  12. Press the Reset button to execute the Zero backup rechargeable battery life counter (refer to the Reset Button Function subsection).

  13. Connect the CU to the mains supply.

Caution

  • If you connect one lift shaft only, it is not necessary to connect the splitters. Use the splitters only if you want to connect 2 or more lift shafts.

 

Warning

  • WARNING! Live parts are exposed after the CU cover is removed!
  • Be very careful and do not touch dangerous live parts!
  • Never work with a switched-on CU with its protective cover off unless you are an authorised person duly trained according to Decree 50/1978 Coll.
  • Never insert damaged batteries. Do not insert the batteries in the CU that might show electric or mechanical damage.
  • Never use 2N® Lift8 without its protective cover to avoid electric accident, malfunction due to wrong interconnection and/or 2N® Lift8 electronics damage or destruction as a result of electric short-circuit or adverse environmental conditions. It is because 2N® Lift8 is not protected against dangerous touch and water – IP00.
  • Make sure before installation that the 2N® Lift8 board is not damaged!
  • Do not connect a power supply other than the allowed one to avoid electric accident or device damage.


Power Supply

  • The CU is powered by 100–240 V mains power.

Warning

  • Never connect an AC source or unstabilised DC source to avoid CU damage.


Rechargeable Battery Connection and State Check

Procedure:

  1. Keep the CU disconnected from the mains.
  2. Loosen the three screws on the upper cover of the CU.
  3. Move the upper cover of the CU in such a way that you can remove it.
  4. Proceed with caution while removing the cover: be careful about the drain wire connecting the cover with the CU bottom part. Do not disconnect the wire unless there is a reason to do so!

  5. Interconnect the rechargeable batteries, but do not connect them to the motherboard.

  6. Plug in the CU supply cable into a 230 V socket.

  7. Now interconnect the batteries with the motherboard using the FASTON cable (see the Fig. below). Maintain polarity.


  8. Replace the upper cover on the CU and tighten the cover fitting screws. Doing so make sure that the earthing wire is connected to the cover!

After plugging the CU into the socket, the LED (Power/battery) should start to flash (charging). The CU charges the rechargeable batteries until fully charged. After some time, the flashing green LED (charging) should change to a permanently illuminated green LED (battery charged). 

Warning

  • Adhere to the polarity of the rechargeable batteries! When the polarity of the batteries is reversed, there is a danger of fire or explosion or damage to the CU electronics.


Rechargeable Batteries 

Caution

  • If backup rechargeable batteries are used for the 2N® Lift8 power supply, the required backup of up to 1 h is guaranteed only if up to 20 audio units are connected in the system.
  • The required 1h backup is not guaranteed if more than 20 audio units are installed.
  • Remember to replace the batteries every two years.

Splitter – CU Bus Connection



Interconnect the CU and splitter using a 6-wire main bus (power + − , audio + − , data + ). Mind the polarity.

Main bus

1 … Main bus power +

2 … Main bus power −

3 … Main bus audio +

4 … Main bus audio −

5 … Main bus data +

6 … Main bus data −

Caution

  • 6-wire
    • Use unshielded wires of the cross-section of 0.75 mm2.
    • The maximum total cable length is 30 m with the cross-section of 0.75 mm2.
    • For higher lengths, enlarge the supply pair cross-section: PWR (60 m – 1.5 mm2, or 100 m – 2.5 mm2).


Audio Units – Splitter (CU) Bus Connection

(the CU is used if one lift shaft is connected)

Interconnect the Splitter (CU) and Audio Units using a two-wire bus. Mind the polarity.


Audio unit bus

1 … Bus for Audio Units +

2 … Bus for Audio Units −

Caution

  • 2-wire
    • Use unshielded wires of the cross-section of 0.75 mm2.
    • The maximum total length per shaft is 600 m.
    • With multi-strand cables, always use a pair of wires which match each other.
    • With a tow cable, consider the cable length too.
    • With special cables (to the cabin), use the neighbouring wires and make sure that the nearest surrounding wires do not radiate interference (power wire, video signal etc.).

Tip

  • Do not lead the bus close to power cables, especially in long-distance sections.
  • Branch the bus to shorten the total length of sections.

Safety

  • The bus is electrically isolated from the telephone line circuits according to the EN60950 standard requirements and its low voltage cannot cause any electrical accident.

Termination Resistance

Connect the termination resistance connector to the first and last device connected to the bus: CU, splitter or I/O module. 

Caution

  • Find the 2-pin termination resistance connector between the main bus connector and audio unit connectors (see the figure below).
  • By default, the termination resistance is connected (jumper mounted).




Examples of Connection:


CU Connection to Telephone Network

You can connect the CU to any of the following telephone networks:  

  • PSTN
  • PBX
  • GSM
  • UMTS
  • VoIP

PSTN

2N® Lift8 works in a broad band regardless of polarity and line parameters (refer to Technical Parameters). Connect it using the enclosed cable with an RJ–12 terminal. It is the most reliable and simplest connection. The disadvantage is the operating cost (fixed fee).

Caution

  • Only one CU may be connected to one telephone line and no other end telephone equipment may be connected to the line including a product through which the telephone line goes (so-called priority connection – electronic burglar alarm, e.g.).
  • No dual or party lines may be used.
  • No telephone “multiplugs” (adaptors), even the smart ones, may be used.
  • Never connect 2N® Lift8 to an ISDN line.


Telephone line requirements

  • The line must not be a dual or party one.
  • The telephone socket and its wiring are usually the network provider's property and may not be tampered with. 


Other recommendations

  • Notify the telephone network provider of your 2N® Lift8 installation and submit certification upon request.
  • Your follow-up wiring must comply with the relevant safety regulations.
  • You are recommended to secure your cabling against pirate connection (with a telephone lock, e.g.).

Connection via PBX (Private Branch Exchange)

  • This is the least-cost solution where a PBX and an unused PBX line are available.

PBX line requirements

  • The PBX to be used must work reliably even in the case of power outage. Large PBXs are mostly equipped with a back-up power supply, smaller PBXs usually use PSTN line redirection in the event of power failure. Consult the problem with the technician responsible for your PBX. An error during power outage may result in 2N® Lift8 calling an undesired station.
  • Relevant call access rights have to be assigned to the PBX line to be used (use a standard telephone set to check whether the line can make outgoing calls to all the required numbers).
  • While programming, enter the necessary PSTN code (typically a zero), or (preferably) make the PBX not require a prefix (so-called automatic connection to the provider's telephone line).
  • To make the control room – lift calls, you have to know the extension number and how to get through to it (dial-in, DISA, operator).
  • The control room – lift connection may not depend on the operator’s presence; no call forwarding to a fax/answering machine in the night mode is allowed, etc.

Other recommendations

  • Make an agreement with the PBX owner regarding operating costs (2N® Lift8 outgoing calls are billed at the owner‘s expense with the exception of free calls via “green lines”). 

Tip

  • If there is permanent manning in your building (security staff, receptionist), train the personnel how to rescue people and program 2N® Lift8 to call this service.


GSM

This is used in particular where no PSTN line is available.


Recommendation

  • In places with a poor signal quality find an appropriate place or use a special (directional) antenna.
  • Protect the SIM card from theft.
  • If a prepaid SIM card is used, make sure that the credit is monitored and topped up in time.

UMTS

This is used in particular where no PSTN line is available. If 2N® Lift8 is connected via UMTS, the system can be configured remotely using the 2N® Lift8 Service Tool application.


Recommendation

  • In places with a poor signal quality find an appropriate place or use a special (directional) antenna.
  • Protect the SIM card from theft.
  • If a prepaid SIM card is used, make sure that the credit is monitored and topped up in time.

Operation without SIM card or PSTN line

  • 2N® Lift8 can be used as an intercom without an inserted SIM card or connected PSTN line during the lift fitting time. In this case do not enable the lift blocking function until the telephone line is connected.

VoIP

VoIP is the cheapest solution where a reliable Internet connection is available.