This document forms the user manual for the WZRDnet Handset Model
WHD-310(V)2. As such it presents a detailed equipment description
including the physical characteristics and operational instructions for the
Handset.
2. Features
WZRDnet is a low-power wireless ad-hoc mesh network that provides
secure voice and data communications without the need for infrastructure
(i.e., no cell towers or satellites required). In WZRDnet each handset is a
router, relaying calls from originator to destination. Unlike other mesh
networks, this architecture does not employ central routing tables thus
avoiding single points of failure. WZRDnet is a low-power network that
allows its light-weight handsets to provide service for 38 hours between
battery recharges. WZRDnet is a true end-to-end packet switched network
which facilitates straight-forward interoperability with Wide Area Networks
(WANs) supporting peer-to-peer communications and direct dialing. This is
accomplished via the WZRDnet Gateway which provides connectivity with
any available IP network (e.g., Wi-Fi, VOIP, etc.), or analog network (i.e.,
PSTN).
The WHD-310(V)2 Handset design was focused on SWAP (size, weight and
power). It provides four times the battery life as compared to commercial
two-way radios at one quarter of the weight. Handset operation is
accomplished via a color LCD display and menu-driven control buttons. This
reduces training time and facilitates simple inclusion of specific customer
features at minimal cost. WZRDnet Handsets include embedded GPS
receivers for friendly force tracking and situational awareness.
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SECTION 2: EQUIPMENT DESCRIPTION
1. Handset Characteristics
Physical Characteristics
• Dimensions:
o Handset: 1.3 x 2.8 x 5.4 inches
o Antenna length: 2 inches
• Weight: 0.6 lbs including battery pack
Internal Components
• 1.5 inch Color LCD Screen
• 2.4 GHz Radio Transceiver
• GPS Receiver
• Real-Time Clock
• Integrated Speakerphone
• Microphone
• 5-Button Navigation Tool
• Illuminated Keypad
• Mini-USB Port
• 2.5mm Audio Output Jack
External Components
• Mini-USB to USB Cable
• Headset with Push-to-Talk button and microphone
• Shoulder Microphone with Push-to-Talk button and speaker
• Replaceable/ Rechargeable 3500mAhr Lithium Ion Battery Pack
• 110VAC Wall Adapter.
Additional Software
• USB to Serial Driver
• WZRDnet Command Center
WHD-310(V)2 User Manual
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WHD-310(V)2 User Manual
Figure 2.1.1 WHD-310(V)2 Handset
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WHD-310(V)2 User Manual
SECTION 3: HANDSET POWER
1. Handset Power
Main power to the WHD-310(V)2 is provided by either a rechargeable
3500mAhr Lithium Ion battery pack or by an external power source
connected to the Handset’s USB port. The battery pack is constantly
monitored and protected by an embedded battery gauge circuit. It is
recharged whenever an external power source is connected to the USB
port. An internal charger circuit determines whether the power is being
supplied by battery pack or through an external power source.
The Handset’s on-board voltage regulator provides three separate outputs
of 3.3VDC each. One output powers the microcontroller, and the other two
power the peripherals and the DC-DC converter for the Liquid Crystal
Display (LCD) backlight.
1.1 Battery Charging
The battery pack is recharged via the USB port. This can be done by
connecting to a PC via a mini-USB to USB cable or to a 5VDC 500mA to
1A wall charger. The Handset will automatically determine which
charging method is being used and configure itself accordingly.
1.2 Battery Gauge
The current state of the Handset’s battery pack is displayed with a
battery icon on the LCD screen. The user can monitor the voltage and
be alerted when the battery is low. When the battery voltage drops
below a predetermined level, the handset will shut down automatically to
save power.
Number of Bars Minimum Voltage Maximum Voltage
3 4v 4v and up
2 3.8v 4v
1 3.5v 3.8v
Flashing bars 3.3v 3.5v
Automatic
shutdown
0 3.3v
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WHD-310(V)2 User Manual
SECTION 4: MODES OF OPERATION
1. Start-up Mode
The Handset enters Start-up Mode when the battery pack is charged and
the center button of the keypad is pressed. It can also enter Start-up Mode
automatically through a Real-Time Clock alarm. In the absence of a charged
battery pack, the Handset enters Start-up Mode when an external power
source, i.e., a PC or a wall charger is connected to the USB port.
When Start-up Mode is entered, the microcontroller checks the condition of
the battery supply to determine if it should proceed to Power-on Mode.
2. Power-on Mode
The Handset is in Power-on Mode when the user is interacting with the
Handset and it is running at maximum clock frequency with all the
peripherals fully functional. Because this mode consumes the most power,
the handset will enter Idle Mode or Power-off Mode as soon as conditions
permit.
3. Idle Mode
The Handset enters Idle Mode when the user is inactive for a predetermined
amount of time and the USB port is not connected to an external power
source, i.e., a PC or a wall charger. In Idle Mode the LCD screen is
disabled and the microprocessor runs at minimal clock frequency of 500Hz
in order to preserve power.
The handset will not go into idle mode if the handset is in the following state
of operation:
• Engaged in a PTT call segment
• Engaged in a Talk Group communication
• Engaged in an external call through the Gateway
• Performing a GPS function
• Performing a registration with the Gateway
In Idle Mode, the RF transceiver remains active as a repeater in order to
interchange messages inside the mesh network. If the transceiver receives
a message for the Handset, then the Handset transitions to Power-on Mode
and the microprocessor resumes running at the higher clock frequency.
4. Power-off Mode
The Handset enters Power off Mode by a controlled power-off sequence or
by an uncontrolled power off sequence. Both sequences will cause the
main regulator to be disabled as the voltage supply disappears, thus the
Handset will remain off.
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WHD-310(V)2 User Manual
4.1 Controlled Power off
The WHD-310(V)2 can be powered off by pressing the center button of
the keypad for 1 second.
4.2 Uncontrolled Power-off
The Handset is powered off automatically if the battery voltage falls
below a predetermined threshold or if the battery is removed from the
Handset. The Handset is also powered off when the battery gauge
disconnects the battery due to over temperature, over voltage, or under
voltage.
Return to the Power-on Mode occurs when an external power source,
i.e., a PC or a wall charger is connected to the USB port or a charged
battery is inserted.
5. No Supply Mode
The Handset enters this mode if the battery pack is completely depleted and
the voltage level falls below the undervoltage threshold.
Return to the Power-on Mode occurs when an external power source, i.e., a
PC or a wall charger is connected to the USB port or a charged battery is
inserted.
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WHD-310(V)2 User Manual
SECTION 5: NETWORK COMMUNICATIONS
1. Overview
The networking technology employed by WZRDnet is based on the IEEE
802.15.4 protocol. Each Wireless Mesh Network (WMN) is defined with a
unique WMN Identifier (WMN ID).
2. Mesh Networking
WZRDnet supports mesh routing, allowing data packets to traverse multiple
nodes in order to reach the destination node. This allows nodes to be
spread out over a large region while still supporting communications among
all nodes in the network.
3. Router
A Router must associate with a WMN before it can transmit, receive, or
route data. In order to associate with a network the node must be provided
the following network information:
• Operating channel
• WMN ID
• Network Key (for encryption only).
A Router assists in routing data and therefore its RF section must remain
fully-powered when in idle. Handsets, Repeaters and Gateways are all
considered Routers in the Mesh Network.
4. Ad-Hoc Network
WZRDnet is an ad-hoc network that is a comprised of self-configuring
handsets. These handsets either form a new network or associate with the
nearest available network. This encourages large-scale networks with
minimal infrastructure support required.
4.1 Network Formation
A network is formed by selecting an operating channel and WMN ID.
Encrypted networks require assigning a network key for nodes to
decipher data.
4.1.1 Operating Channel
A WMN can operate on twelve channels from 1 to 12. The channel
can be changed directly from the handset in cases of noise or
excessive traffic.
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4.1.2 WMN ID
The WMN ID is used to uniquely identify a WMN on a specific
channel. Multiple WMNs can operate independently on the same
channel as long as each is assigned a unique WMN ID.
4.1.3 Network Key
The network key is used to encrypt and decrypt packets on a
secure network. The handset must have the correct key in order to
decipher packets.
4.2 Associating with a WMN
WZRDnet Handsets include a factory preset WMN ID and operating
channel. The operating channel can be changed from the handset and
the WMN ID can be changed with the WZRDnet Command Center
software. For instructions on changing the Node WMN ID see the
WZRDnet Command Center User Manual.
WHD-310(V)2 User Manual
5. Network Addressing
The 802.15.4 protocol specifies a 64-bit MAC address. A Node Identifier
String can also be specified as a simple way to route packets to the
underlying address.
5.1 64-bit MAC Address
Each node contains a unique IEEE defined 64-bit MAC address. The 64bit address uniquely identifies a node and is static.
5.2 Node Identifier String (NI)
A node can be assigned a character based Node ID. The Node ID can
be used to route messages to a specific node. The Node ID will then be
linked to the underlying MAC address for packet transmission. For
instructions on changing the NI String see the WZRDnet Command
Center User Manual.
6. Broadcast Transmission
Broadcast transmissions are intended to be propagated throughout the
entire network such that all nodes receive the transmission. This is useful
for emergency alerts or network notifications. Each WHD-310(V)2 comes
with the ability to broadcast voice and text messages as a standard feature.
The WZRDnet Command Center application allows broadcast text
messages.
7. Node Discovery
A node discovery mechanism can be used to discover all nodes that are
associated with a network. A node discovery sends a broadcast discovery
transmission throughout the network. All handsets that receive the
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WHD-310(V)2 User Manual
command will send a response that includes the handset’s addressing
information, Node Identifier String, and other relevant information.
8. Node Search
The WHD-310(V)2 provides the ability to search for a specific node based
on the assigned Node Identifier String.
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WHD-310(V)2 User Manual
SECTION 6: WZRDnet COMMUNICATION UTILITIES
1. WZRDtalk™ Voice Communication
WZRDtalk is the voice communication utility of the WHD-310(V)2 which
allows users to send and receive voice quickly and seamlessly. Voice
messages are played over an integrated speaker or through a Push-To-Talk
(PTT) headset for private conversations. Due to speaker volume the WHD310(V)2 should never be held against a user’s head.
1.1 Call Initiation
The call originator selects a destination and initiates a call to that
destination by pressing and holding the PTT button. After a call is
initiated, an invitation is sent to the destination.
1.2 Call Invitation
The call invitation determines the operating status of the destination.
The system then automatically responds whether the user is ready to
accept calls or is busy. The destination hears an audible alert when an
invitation is received and the user is ready to accept calls.
1.3 Call Establishment
The call originator receives an audible alert if a response to the invitation
was received and the destination is ready to accept the call. The
response is received approximately 1-3 second after the call was
initiated depending on the location of the destination and the status of
the routing path. If the user is out of range and no response is received,
a message will be displayed informing the user that the call has failed.
1.4 Call Communication
After a call is established the call originator will continue to hold the PTT
button and begin talking.
1.5 Call Disconnect
A call disconnect is sent automatically when the user is finished
speaking and the PTT button is released.
1.6 Call Reply
The call remains active for 15 seconds after each communication and
displays the originator/ destination on the screen. After 15 seconds the
call status will become inactive. To reconnect the originator and
destination will have to go through the call initiation process.
Alternatively it is possible to connect via the Speed Dial feature
described below.
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WHD-310(V)2 User Manual
Figure 6.1.1 WZRDtalk Process
2. External Network Dialing
WZRDnet allows handsets to communicate with external Wide Area
Networks (WANs) by providing a mechanism to transfer voice or data to the
following external networks and utilities:
Public Switched Telephone Network (PSTN)
• Analog voice communication via landline or mobile telephones.
Session Initiation Protocol (SIP) Phone
• A signaling protocol to control voice communication over Internet
Protocol (IP). A SIP phone is a hardware-based or software-based
SIP user agent, that provides call functions such as dial, answer,
reject, hold/ unhold, and call transfer.
Instant Messaging (IM) Client
• An IM client is a service that is based on either of the following realtime communication protocols developed by the Internet Engineering
Task Force (IETF):
o SIMPLE - Session Initiation Protocol for Instant Messaging and
Presence Leveraging Extensions.
o XMPP - Extensible Messaging and Presence Protocol (XMPP)
The key WZRDnet element which supports the external dialing feature is
the WZRDnet Gateway which consists of a hardware unit and internal
supporting software. The WHD-310(V)2 Handset register automatically
with the Gateway. The Gateway maintains a constant list of all handsets
in the network including their MAC addresses and other identifying
information. The key components of the WZRDnet Gateway are
described in the following:
2.1.1 WZRDnet Access Point
The WZRDnet Access Point (WAP) can be either embedded in the
WZRDnet Gateway or be standalone equipment. It provides a link
between the WZRDnet network and the WAN. The WAP is able to
transfer packets between the WZRDnet and the WAN via Wi-Fi,
Ethernet or Serial transmission. The WAP wraps the WZRDnet
packet in the WAN format but does not do any conversion of the
underlying packet.
A single WAP can process multiple calls simultaneously. In
operation, a WHD-310(V)2 desiring to send a voice segment to a
WAN destination will identify the WAP in closest proximity to it. The
voice segment, defined as the time between pressing and releasing
the PTT button, will be processed through the same WAP. The
WAP can change over the course of a “call” but not within a single
voice segment.
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