Sirona Cerec User manual

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CEREC Radio Device
Operating Manual
This document contains a functional and operational manual for the CEREC Radio Device
which implements a wireless network to be used for the communication between
acquisition units and milling units in the CEREC system.

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Table of contents
1. Introduction
1.1 Important User Information
1.2 FCC and IC Declarations
2. Product Description
2.1 Operational Elements
2.2 LED Indications
3. Specification
4. System description
4.1 CEREC system
4.2 System components
4.3 Main function
4.4 Network unit
5. Networking
5.1 CEREC Radio Device network overview
5.2 Creating a network
5.2.1 Creation
5.2.2 Isolated network unit
5.2.3 Persistent network
5.2.4 Installation
5.2.5 Maximum size
5.3 Network creation failures
5.3.1 Isolated network unit
5.3.2 Multiple networks created
5.4 Extending the network
5.4.1 Add new network unit
5.4.2 Reduce network
5.5 Increasing network coverage
5.5.1 LAN cable extension
5.5.2 Connecting to Ethernet infrastructure
5.6 Reset to factory defaults
5.7 Network unit states
5.7.1 States definitions
5.7.2 State transitions
5.7.3 LED indications
5.8 Radio characteristics
5.8.1 Frequency spectrum
5.8.2 Channel control
5.8.3 Channel switching
6. Use cases
6.1 Moving around
6.1.1 Moving within network
6.1.2 Temporarily disconnected
6.1.3 Disconnected
6.2 Transmit data wirelessly
6.2.1 Stationary data transmission
6.2.2 Network routing

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6.2.3 Multiple streams
6.3 Transmit data using LAN
6.3.1 LAN routing
6.3.2 Handover
6.3.3 Simultaneous access
6.4 Interrupted transmission

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1. Introduction
Thank you for choosing Sirona CEREC Radio Device.
CEREC Radio Device (part no. 6543891 D3492) is a powerful 100 Base-T Ethernet
wireless transmission system that allows peripheral devices to build up a wireless
network or to access a wired network. The CEREC Radio Device operates in the 2.4 GHz
ISM band and complies with FCC, IC and EC regulations.
CEREC Radio Device is easy to install and does not require specific drivers. It can be
used with most computers and operating systems.
This manual includes the device’s technical data and operating instructions.
In case of problems during the installation or during the operation that cannot be solved
with the information given in this manual, please contact the service department of your
local dealer or contact:
In the USA:
Sirona Dental Systems GmbH Sirona Dental Systems LLC
Fabrikstrasse 31 4835 Sirona Drive, Suite 100
D-64625 Bensheim Charlotte, NC 28273
Germany USA
www.sirona.com
1.1 Important User Information
CEREC Radio Device (part no. 6543891 D3492) does not require maintenance work or
special attendance except for the following instructions outlined below.
CAUTION:
Do not operate the device within the range of strong electromagnetic fields.
Comply with the temperature range for operation mentioned in chapter
Technical Data. Avoid overheating.
Protect device against humidity and dust.
Clean device only with a soft cloth and mild cleaning agent. Do not apply water
or wet cleaner.
Do not insert any objects into device openings unless specifically mentioned
otherwise in this document. This may damage the device.

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Do not open the CEREC Radio Device.
The CEREC Radio Device does not contain parts which could be maintained,
exchanged or repaired by the customer or non-authorized maintenance
personnel.
Opening the device can damage the electric components. A correctly
functioning device is no longer guaranteed!
1.2 FCC and IC Declarations
Compliance statement
This device complies with part 15 of the FCC Rules and to Industry Canada’s license-exempt
RSSs.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause
undesired operation.
Warning
Changes or modifications not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment.
This in particular is applicable for the antenna which has been delivered with the CEREC Radio
Device.
RF Exposure
To comply with FCC RF exposure requirements for mobile transmitting devices, this
transmitter should only be used or installed at locations where there is at least 20cm
separation distance between the antenna and all persons.
Information to the User
Note: This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates,
uses and can radiate radio frequency energy and, if not installed and used in accordance with
the instructions, may cause harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interference by
one or more of the following measures:
--Reorient or relocate the receiving antenna.
--Increase the separation between the equipment and receiver.
--Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
--Consult the dealer or an experienced radio/TV technician for help.
This device complies with Industry Canada ICES-003: CAN ICES-3 (B)/NMB-3(B).

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2. Product Description
2.1 Operational Elements
Ethernet
RJ45 connector for Ethernet 100 Base-T with red and green LED
DC Input
Micro B USB connector for 5V DC power supply
Reset
Opening to press reset button. Use small object to press.
LED Indications
Ethernet
Micro B USB
Reset

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Two LEDs are used to indicate the device’s state. Each LED can have the following
states:
1. Off
2. Slow blinking
3. Fast blinking
4. On
The following table shows potential states for the device:
State
Orange
Green
Comment
Booting
Off
Off
Both LEDs are not yet functional.
Networking
Slow
Slow
Typically only seen when setting up a new
network.
Connecting
Off
Slow
Disconnected
On
Slow
Should preferably not occur since the network
unit should be connected.
Connected
Off
On
Device is functioning properly.
Transmitting
Off
Fast
Fast blinking for data transfer.
Error
Fast
Fast
Failure in data communication.

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3. Specifications
Dimensions: Approx. 104 x 75 x 24 mm³
Weight: Approx. 100 g
Operating Temperature: 0...40 °C
Storage Temperature: -25..80 °C
Power Supply: 5.0 V DC (1.4 W max.)
Data Interface: 100 Base-T Ethernet
Radio Band: 2402 .. 2480 MHz
Transmit Power: Max. 10 mW (+10dBm)
Standards: EN60950-1:2006+A12:2011
EN301489-1/-3
EN300440-02 V 1.4.1
AS/NZS4268:2008
FCC: 47 CFR part 15
RSS-210
Conformity: R&TTE, FCC and IC
Modulation: GFSK
Multiplexing: None
Air Data Rate: 1.0 Mbit/s
Payload Data Rate: Up to 300 Kbit/s
Antennas: 2 x omni-directional, integrated reverse SMA (Male),
vertical polarization, ¼ dipole, 2.0 dB gain.
At each time one antenna is used for transmitting (Tx) and
the other one for receiving (Rx).
Range: Line-of-sight; up to 60 m inside buildings, up to 300 m in
open field.
Operating Elements: Push Button on backside
Two LEDs
Housing: Plastic housing
Installation: Desktop or wall mount installation
Accessory: AC/DC adapter Type FW7662/05
Input 100-240VAC / 50-60Hz / 150mA
Output 5V DC / 1.1 A

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4. System Description
This chapter describes the context of the CEREC Radio Device by describing the main
function and identifying the system components.
4.1 CEREC System
Mobile acquisition unit and a stationary milling unit.
The acquisition unit generates the restoration data which is to be transmitted to the
milling unit.
The acquisition unit completes this by setting up a TCP/IP connection to the milling unit.
An Ethernet infrastructure is required to facilitate this.
This can be implemented by a standard wired LAN infrastructure, Wi-Fi or the CEREC
Radio Device system as described in this document.
4.2 System Components
The identifiable components and their role in the CEREC system are listed below:
Actor
Description
Role
Icon
Acquisition
unit
The PC platform that is used to
acquire the dental data.
Data source. Initiates the
transmission to a milling
unit.
Network
unit
A wireless transceiver that has an
Ethernet connector. The Ethernet
socket also has LEDs to indicate
the status.
Wireless node in the
network.
Mobile
network
unit
A network unit which is installed
inside an acquisition unit.
The network unit for the
acquisition unit.
Stationary
network
unit
A network unit is either attached to
the milling unit directly or
connected to a LAN.
Wireless end-point for the
data communication to
the milling unit.
Milling unit
Receives the data and processes it
to mill a restoration.
Data receiver.
Operator
Person possessing technical
knowledge (either by experience,
instruction or education) about the
operational details of the network.
Performs all
infrastructural changes to
the network using
technical knowledge.
Dentist
User who does not possess any
technical knowledge about the
working of the network.
Uses the network to
transmit data.

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4.3 Main Function
The objective of the CEREC Radio Device is to obtain a reliable wireless data connection
between a stationary milling unit and a mobile acquisition unit. The wireless network
that is created can then be used to transmit time constraint data.
For the acquisition units and milling units there is no difference between the CEREC
Radio Device and a wired LAN; the connection is completely transparent.
4.4 Network Unit
The CEREC Radio Device comprises a number of wireless network units that together
create a wireless network. These network units implement a proprietary Sirona protocol
specially developed to comply with time constraint transmission requirements that
followed from the CEREC Radio Device use cases.
The basic functionality of a network unit is to convert incoming Ethernet data into a
number of wireless packages and forward these to one or more selected neighboring
network units and vice versa. This functionality is comparable to an Ethernet network
switch. As such, this network can be used as a wireless LAN and is completely
transparent for any Ethernet communication.
Using this functionality, a link between two network units can support the data
communication of an acquisition unit and milling unit.
A network unit can appear in four roles:
●Directly connected to a milling unit using a LAN cable and powered by the supplied
wall adapter.
●Built into an acquisition unit where it is directly connected to the internal PC via a
LAN cable and powered via the USB 3.0 connection of the PC.
●Connected to another network unit via a LAN cable and powered by the wall adapter.
●Connected to a LAN infrastructure, i.e. to a hub or switch and powered by the wall
adapter.
The schematic representation of a network unit is shown below.

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As illustrated, the network unit has four connectors:
●Antenna
The network unit has two antennas that are screwed on during production. Do not
remove these antennas or use different antennas.
●Micro B USB
For power the network unit has a standard micro B USB connector. A standard
supplied 5V power adapter can be plugged into this connection. However, any
standard USB 3.0 connection can be used to power the network unit. The network
unit integrated in the CEREC mobile acquisition unit is powered in this way.
●RJ-45
A network unit has a RJ45 socket to which a standard LAN cable (CAT5) can be
connected. As such the network unit can be connected to any other Ethernet
communication device or to a Ethernet interconnecting device such as a hub or
switch, i.e. connected to the LAN infrastructure. This is explained further in
“Connecting to LAN infrastructure”.

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5. Networking
This section describes the networking functionality of the CEREC Radio Device. The
following lists the chapters:
●CEREC Radio Device network overview
●Creating a network
●Network creation failures
●Extending the network
●Increasing network coverage
●Reset to factory defaults
●Network unit states
●Radio characteristics

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5.1 CEREC Radio Device Network Overview
The network units in the CEREC Radio Device network create a so called peer-to-peer
mesh network. This means that there is not a master or slave as with Bluetooth or a
central controlling access point as with Wi-Fi.
As such there is no distinction between a network unit connected to a milling unit, one
that is built into an acquisition unit or one that is connected to a LAN infrastructure: any
network unit belonging to the same network (see “Create a network”) can communicate
which each other as soon as they are in each other’s range. This is also applicable when
they are out of range of all other network units making the network connections very
flexible.
This wireless network operates in the 2.4GHz band which is available worldwide for
license-free operation. It therefore needs to be able to operate in coexistence with other
wireless networks such as Wi-Fi or Bluetooth. The network accomplishes this by avoiding
congested channels when possible. However, the network is not immune to interferences
caused by these other wireless technologies. The result of these interferences can be a
reduced range or lower performance. The network technology therefore offers several
easy mechanisms by which a network can be extended to achieve better coverage (see
“Extending the network”).
The network can also easily be extended and the coverage increased, using LAN cables
or even an existing LAN infrastructure (see “Increasing network coverage”).

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5.2 Creating a Network
Network units that come out of the box have never been part of a network. To allow for
several networks of different owners to operate side-by-side or in the same area, new
network units must first create a network. This is described in the following section.
5.2.1 Creation
To create a new network with a number of new network units the following steps must
be completed:
1. Bring all network units together in one room.
2. Power-up all network units within 1 minute of each other.
3. Wait approximately one minute after the last network unit was powered-up.
4. Check that all the network units are connected, indicated by the green LED (see
“LED indications”).
When completed, all network units will belong to a single network and can operate as an
independent network as well as communicate with each other. The created network is
unique worldwide.
See “Network creation failures” should a problem arise.
5.2.2 Isolated Network Unit
A unique network is only created when two or more network units are present. In case of
an isolated network unit, no network is created until another network unit is within
range.
5.2.3 Persistent Network
When a network unit has been added to a network, the network ID is stored
permanently. When network units are power cycled, they will rejoin the network.
5.2.4 Installation
After the network is created, the network units can be switched-off and placed at their
designated locations e.g. connected to milling units.
Since the network creation is permanent, when powered cycled the network units will
remain part of the network. This applies even if they are placed outside of range of other
network units, for example in case of an isolated milling unit in a separate room.
5.2.5 Maximum Size
There can be a maximum of 10 network units in one network. Larger networks are not
possible.

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5.3 Network Creation Failures
The following chapter describes potential issues which could arise when creating a new
network and offers solutions for each scenario.
5.3.1 Isolated Network Unit
When a single network unit is powered-up too late it may not be part of the network.
This can be identified if the LED does not turn green.
This situation is the same as when a new network unit is added to an existing network.
This is described in “Extending the network”.
5.3.2 Multiple Networks Created
When more than one network unit is powered-up too late, these network units could
form their own network.
Initially this will not be clear because all network units will indicate that they have
connections to other network units showing a green LED (see “LED indications”).
Networking
Slow
Slow
In most cases only seen by the operator when
setting up a new network.
Connecting
Off
Slow
Disconnected
On
Slow
Should preferably not happen since you want the
network unit to be connected.
Connected
Off
On
All’s fine. Should be the normal situation.
One way of checking this is to connect a PC with fixed IP address to each network unit
and try to ping the PCs from another PC. Another way is to switch-off all but one
network unit. Then complete the following steps for each additional network unit:
1. Turn-on a network unit.
2. Wait until the orange LED turns off.
3. LED turns green, the network unit belongs to the network.
4. Go to the next network unit.
When a network unit is not connected, the orange LED is continuously on. When this
occurs the network unit must be reset to factory defaults (see “Reset to factory
defaults”) and then added to the network by power-cycling one of the other network
units (see “Extending the network”).

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5.4 Extending the Network
Additional new network units can be added to an existing network. This section explains
how this is done.
5.4.1 Add New Network Unit
New network units can be added to an existing network. However, to prevent any
network unit from becoming part of the network, the user must complete four simple but
specific steps:
1. Place the new network units next to a network unit belonging to the network.
2. Switch-on the new network units.
3. Within one minute, power-cycle the existing network unit.
4. After one minute the new network units will become part of the network.
5.4.2 Reduce Network
In some cases it may be necessary to remove one or more network units from an
existing network.
Sequence:
1. Network unit C is switched-off.
2. After approximately 5 seconds both network units A and B detect the lost
connection to network unit C.
Notes:
●There is not a difference if the network unit C would be moved out of the range of
the network other than having a transition period.
●It does not matter whether the connection between the network units is wireless
or via LAN.
The network units by themselves cannot distinguish the difference between a network
unit that is switched off and is to be removed from the network and a situation in which
the network unit is moved out of range. The removed network unit will still occupy an
entry in the network information administration. Normally this does not affect the
performance of the network at all.
However, since the number of network units in the network information administration is
limited, this can be a problem if a network unit is removed a number of times.
To clear the list of detected network units the network units can be power-cycled.

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5.5 Increasing Network Coverage
This chapter describes how the network coverage can be increased in case the network
suffers from severe interference or needs to cover long distances.
5.5.1 LAN Cable Extension
Normally, a network unit is either connected to a milling unit or to the PC inside the
acquisition unit. With this configuration the communication always goes from the PC to
the connected network unit, then to the neighboring network unit which is connected to
the milling unit and finally to the connected milling unit: AC PC →network unit →
network unit →milling unit
For a network unit it does not matter where the Ethernet data is coming from. It simply
will forward the data.
Should the network suffer from severe interference or needs to cover distances longer
than the transmission range, additional network units can be added and interconnected
using a LAN cable.
1. In the communication the mobile network unit in the acquisition unit sends the
packet to stationary network unit A.
2. Stationary network unit A forwards the packets onto the LAN.
3. Stationary network unit B receives the packet and forwards it to the wireless
network, i.e. to stationary network unit C.
4. Stationary network unit C forwards this packet to the connected milling unit.
Note that the basic functionality of a network unit is to relay data from the Ethernet
connection onto the wireless network and vice versa. Extending the network is always
done using LAN cables. Simply placing an extra network unit in between two network
units that are out-of-range does not work since this would mean relaying data from
wireless to wireless. This is not implemented in the CEREC Radio Device because this
would quickly lead to unsatisfactory performance in most cases.

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5.5.2 Connecting to Ethernet Infrastructure
The network units can also be connected to an existing LAN infrastructure.
In this way, the flexibility of increasing the coverage is very straightforward.
5.6 Reset to Factory Defaults
A network unit that was previously part of a network can be removed from this network.
This is completed by holding the reset button for five seconds.
This will reset the network unit to factory defaults.

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5.7 Network Unit
The proper behavior of a network unit can be identified by its state. This chapter
describes the states that can be identified for a network unit. To provide feedback on the
proper operation of the network unit to the user, these states are also mapped onto LED
indications.
5.7.1 State Definitions
The following states can be identified for a network unit:
State
Description
Booting
The firmware is starting up the network unit.
Read network info
Network information is read from persistent memory.
Network setup
The network unit was not previously part of a network and is trying to
detect other network units to create a new network.
Network extension
The network is created, but still new network units can be added to
extend the network.
Check connections
Checking whether the network unit is still in range of (has a connection
to) one or more neighboring network units.
Disconnected
Part of a network, but not in range of other network units.
Connected
Connected to one or more network units.
Transmitting
Relaying Ethernet packets from wireless to the LAN and vice versa.
Error
Hardware fault.
5.7.2 State Transitions
The transitions between these states are given in the following figure:

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The transitions are described in the following table:
State
Transition
Description
Initial
Power-up
Boot program starts-up after reboot or power on.
Booting
Ready
The firmware is started.
Read network
info
No network
The network unit was not previously part of a network. A
network setup timer of 1 minute is started.
Read network
info
Networked
The network unit was part of a network before, i.e. the network
unit is power-cycled.
Network setup
Detected
A new network unit was detected and will be added to the
network. The timer is restarted.
Network setup
Timeout
The network is created and stored persistently in the network
unit.
A network extension timer of 1 minute is started.
Network
extension
Detected
A new network unit was detected and will be added to the
network. The timer is restarted.
Network
extension
Timeout
The network set-up finished.
Check
connections
Still
connected
The network unit has connections (i.e. is still in range), to one or
more of its neighboring network units.
Check
connections
No
connection
There are still no connections.
Connected
Disconnect
The network unit lost the connection to its last neighbor and is
effectively isolated.
Connected
Data
The network unit received an Ethernet frame which is to be
forwarded to one of its neighbors.
Transmitting
Ready
Ready transmitting data.
Disconnected
Connect
A connection was established with another network.