Eaton 9479-ETG-CSL User manual

9479-ET(G)-CSL
CSL Intrinsically Safe Gigabit
Ethernet WLAN AP / Bridge
March 2021
INM 9479-ET(G)-CSL Rev 1
Instruction manual
MTL Industrial Network Solutions

ii INM 9479-ET(G)-CSL Rev 1
DECLARATION OF CONFORMITY
A printed version of the Declaration of Conformity has been provided separately within the original shipment of goods.
However, you can find a copy of the latest version at -
http://www.mtl-inst.com/certificates

iii INM 9479-ET(G)-CSL Rev 1
CONTENTS
1 FEATURE ..........................................................................1
2 DESCRIPTION ......................................................................2
3 CONNECTIONS.....................................................................3
3.1 DATA & POWER TERMINALS ...............................................................3
3.2 LAN (RJ45) 10/100/1000 BASE-T Ethernet ......................................................3
3.3 LED indicators ...........................................................................3
4 ORDERING INFORMATION ...........................................................4
5 DIMENSIONS ......................................................................4
6 ENVIRONMENTAL ..................................................................4
7 WASTE REMOVAL INFORMATION .....................................................4
8 INSTALLATION .....................................................................5
9 ATEX & IECEx CERTIFICATION INFORMATION ......................................6
10 SPECIFICATION.....................................................................8
11 APPROVALS .......................................................................9
12 NETWORK SETUP .................................................................10
12.1 Network Configuration ....................................................................10
13 WI_FI SETUP......................................................................12
14 DHCP SERVER ....................................................................16
15 SYSTEM STATUS ..................................................................18
15.1 Device Information .......................................................................18
15.2 Network Interfaces.......................................................................18
16 ROUTES .........................................................................20
17 HTTP/HTTPS ......................................................................21
18 FIRMWARE .......................................................................22
19 PASSWORD.......................................................................22
20 SYSTEM..........................................................................23
21 SYSTEM LOG .....................................................................24
22 NETWORK UTILITIES ...............................................................26
23 SAVE CONFIG / RESET .............................................................26

iv INM 9479-ET(G)-CSL Rev 1
GENERAL SAFETY INFORMATION
Safety instructions for installation and operating personnel
The operating instructions provided here contain essential safety instructions for installation personnel
and those engaged in the operation, maintenance and servicing of the equipment.
WARNING !
A ‘WARNING’ marked in this way is provided for operator and plant safety and MUST be followed.
CAUTION !
A Caution is provided to prevent damage to the instrument.
NOTE
These are used to guide the user in the operation of the instrument.
Before commencing installation or commissioning:
• Read and understand the contents of this manual
• Ensure installation and operating personnel have received adequate training for this task
• Ensure that any operating instructions are fully understood by the personnel responsible.
• Observe national and local installation and mounting regulations (e.g. IEC 60079-14).
WARNING !
These assemblies may not be used in explosion-hazard area applications if they have been used
previously in general electrical installations.
WARNING !
The responsibility for planning, installation, commissioning, operation and maintenance, particularly
with respect to applications in explosion-hazard areas, lies with the plant operator.
During operation:
• Make the relevant instructions available at all times to the operating personnel.
• Observe safety instructions.
• Observe national safety and accident prevention regulations.
• Operate the equipment within its published specification.
• Servicing, maintenance work or repairs not described in this manual must not be performed without
prior agreement with the manufacturer.
• Any damage to this equipment may render its explosion protection null and void.
• No changes to any of the components that might impair their explosion protection are permitted.
If any information provided here is not clear:
Contact Eaton’s MTL product line or an authorised distributor or sales office.
NOTE
Improper installation and operation of the enclosure can result in the invalidation of the guarantee.

1INM 9479-ET(G)-CSL Rev 1
1 FEATURE
• Intrinsically Safe ATEX / IECEx Certification
• Dual Band 2.4GHz / 5GHz WLAN Support
• Dual Antenna 802.11n MIMO 2T2R
• Access Point (AP) Mode or Client/Bridge Mode
• Dual Port Switch 10/100/1000MB LAN (daisy-chain capability)
• Versions: 2x Gigabit LAN Ports (-ETG), or 2x 10/100 LAN/PoEx* Ports (-ET)
• CPU Management Feature via Web Pages
• Compact dimensions (W: 42 x H: 160 x D: 140 mm)
• Ex ia IIB T4 Ga, Ex ia [ia Da] IIIC T135ºC Db (non-mining),
Ex ia I Ma (M1 mining)- ETG version
• Ex ia IIC T4 Ga, Ex ia [ia Da] IIIC T135ºC Db (non-mining),
Ex ia I Ma (M1 mining)- ET version
• Ta -40ºC to 70ºC
• Zone 1 / Zone 21 mounting
• (Zone 0 / Zone 20 with a suitable Ex ia Power Supply)
*Note – PoEx is a simple adaptation of the IEEE 802.3af Power over Ethernet
(PoE) standard to bring the benefits to the 9400 Range of Hazardous Area devices.
This allows two spare pairs in the existing Cat5e cable to distribute the power
supply from a 9476 Ethernet Switch (Power Sourcing Equipment – PSE) to each
of the devices connected to its five ports (PD – Powered Device). This adaptation
is necessary due to restrictions for Hazardous Area use. It is not implied that the
device conforms to the 802.3af (PoE) standard.

2INM 9479-ET(G)-CSL Rev 1
2 DESCRIPTION
The 9479-ET(G)-CSL is an Intrinsically Safe (IS) WLAN AP/Bridge Module suitable for
Zone 1 / Zone 21 mounting, (Zone 0 / Zone 20 with a suitable Ex ia Power Supply).
It may be configured as either an AP or Client/Bridge. Also supporting either 2.4GHz or
5GHz operation further extends its range of applications.
There are 2x RJ45 (LAN) ports that support 10/100/1000 IS Ethernet connections –
these can allow ‘daisy-chaining’ of units together.
Power (12V DC) is supplied to the module either locally or using Power over Ethernet
(PoEx) from the LAN port - This requires the PoEx output to be wired to the Supply
Input terminals by the user (-ET version only).
The compact and cost effective design makes it the ideal choice for many applications:
Petrochem
Process Monitoring & Control...
Mining
Underground Communication Links, PLC and Machine Monitoring…
Electrical connections are via cage-clamp and/or screw type plug/socket terminals
along with RJ45 type connectors for the Ethernet LAN ports.

3INM 9479-ET(G)-CSL Rev 1
3 CONNECTIONS
3.1 DATA & POWER TERMINALS
Power + External IP Rated LEDs (CON1)
Pin Function Pin Function
1Power In +12V# 2Power In 0V#
3LAN1 PoEx +12V# 4LAN1 PoEx 0V#
5LAN2 PoEx +12V# 6LAN2 PoEx 0V#
7 8
910
11 0V 12 0V
13 LAN1 LED 14 LAN2 LED
15 WLAN LED 16
17 18
#Connect LAN1 OR LAN2 PoEx terminals to Power In terminals to use this function
External IP66 rated LEDs wire down to 0V
Power Ui = 15.4V
3.2 LAN (RJ45) 10/100/1000 BASE-T Ethernet
Pin 10/100 Function Gigabit Function
1Tx + BI_DA+
2Tx- BI_DA-
3Rx + BI_DB+
4PoEx +12V* BI_DC+
5PoEx +12V* BI_DC-
6Rx- BI_DB-
7PoEx 0V* BI_DD+
8PoEx 0V* BI_DD-
*Note - PoEx only on LAN1-2 ports when 10/100 (-ET version only)
PoEx not available on Gigabit ports
3.3 LED indicators
OFF FLASH ON
PWR (green) Power Fail N/A Power OK
WDG (green) Fault Green- Healthy
(10Hz)
Fault
STAT (green) Initialising or
Fault
N/A Healthy
RJ45 ACT (yellow) Ethernet link
disconnected
Ethernet link
activity
Ethernet link connected
RJ45 1000 (green) 10/100Mbps N/A 1000Mbps
WLAN ACT (blue) No Link Data Linked
LAN1 – LAN2 EXT
LED
Ethernet link
disconnected
Ethernet link
activity
Ethernet link connected
WLAN EXT LED No Link Data Linked

4INM 9479-ET(G)-CSL Rev 1
4 ORDERING INFORMATION
Part Number Description Comments
9479-ETG-CSL Gigabit WLAN AP / Bridge Standard
9479-ET-CSL WLAN AP / Bridge (10/100 PoEx) Special Order
(Subject to MOQ)
Note: 2x Antenna required (not included) these need to be ordered separately
Accessories
Part Number Description
ANTSMA94 Antenna SMA Plug, length 150mm Gain, 3dBi
ANT94 Antenna TNC Plug, length 150mm Gain, 3dBi
ANT94RA Stubby Antenna TNC 90° Plug, length 80mm, Gain 2dBi
CSL-RG316-SMA-1000 SMA Bulkhead Socket ⇔SMA Plug, length 1000mm RG316
Cable Assembly
CSL-RG316-TNC-SMA-1000 TNC Bulkhead Socket ⇔SMA Plug, length 1000mm RG316
Cable Assembly
5 DIMENSIONS
Width 42mm
Height 160mm
Depth 140mm
Weight 1500g
Mounting Din Rail
6 ENVIRONMENTAL
Operating Temperature
-40°C…+70°C
Storage Temperature
-40°C…+70°C
Humidity
0…95% RH, non-condensing
Ingress Protection
Select enclosure to suit application, see certificates for information
7 WASTE REMOVAL INFORMATION
The electronic equipment within must not be treated as general waste. By
ensuring that this product is disposed of correctly you will be helping to
prevent potentially negative consequences for the environment and human
health, which could otherwise be caused by incorrect waste handling of this
product. For more detailed information about the take-back and recycling
contact Controlled Systems Ltd

5INM 9479-ET(G)-CSL Rev 1
8 INSTALLATION
WARNING !
See Special Conditions of Safe Use in the folllowing section regarding
ATEX & IECEx Certification Information before installation
The 12V supply to the module connects via screw terminals 1 + 2 as shown above.
If the unit is being powered using Power over Ethernet (PoEx), it is required that you
connect the relevant PoEx power terminals (Con1) to the main power supply pins
(Con1), see connections section.
As the 9479 supports Auto MDI/MDI-X, a straight connected RJ45 Cat5e cable is used
to connect to any device.
It is recommended that Cat5e cables for Hazardous Area Zone 1 use are ‘Blue’ in
colour and are of good quality (see accessories section), the Safe Area cables being a
colour other than blue to aid identification.
The operating parameters must not exceed those as detailed on the certificate.
This apparatus must only be installed or replaced by a competent person who must
ensure that existing IS segregation is maintained.

6INM 9479-ET(G)-CSL Rev 1
9 ATEX & IECEx CERTIFICATION INFORMATION
The following information is in accordance with the Essential Health and Safety
Requirements (Annex II) of the EU Directive 2014/34/EU [the ATEX Directive- safety of
apparatus] and is provided for those locations where the ATEX Directive is applicable.
General
a) This equipment must only be installed, operated and maintained by competent
personnel. Such personnel shall have undergone training, which included instruction
on the various types of protection and installation practices, the relevant rules
and regulations, and on the general principles of area classification. Appropriate
refresher training shall be given on a regular basis. [See clause 4.2 of EN 60079-17].
b) This equipment has been designed to provide protection against all the relevant
additional hazards referred to in Annex II of the directive, such as those in clause
1.2.7. This equipment has been designed to meet the requirements of intrinsically
safe electrical apparatus in accordance with EN 60079-0, EN 60079-11 and EN
60079-26.
Installation
a) Reference to the IEC code of practice IEC 60079-14. In addition particular
industries or end users may have specific requirements relating to the safety of
their installations and these requirements should also be met. For the majority of
installations the Directive 1999/92/EC [the ATEX Directive- safety of installations]
is also applicable.
b) Unless already protected by design this equipment must be protected by a suitable
enclosure against
i) mechanical and thermal stresses in excess of those noted in the
certification documentation and the product specification.
ii) aggressive substances excessive dust moisture and other contaminants
c) This apparatus is intrinsically safe electrical apparatus and is normally mounted in
a hazardous area.
Inspection and maintenance
a) Inspection and maintenance should be carried out in accordance with European,
national and local regulations which may refer to the IEC standard IEC 60079-17.
In addition specific industries or end users may have specific requirements which
should also be met.
b) Access to the internal circuitry must not be made during operation.
Repair
This product cannot be repaired by the user and must be replaced with an equivalent
certified product.

7INM 9479-ET(G)-CSL Rev 1
Specific Conditions of Use (Special Conditions)
The following conditions relate to safe installation and/or use of the equipment.
8.1 For Group I, the modules shall each be mounted within an enclosure providing a
degree of protection of at least IP54.
This shall be in accordance with EN 60529, and the modules installed in a manner
that does not impair the existing creepage and clearance distances. The enclosure
shall also comply with the appropriate requirements of Clauses 7.4.2 and 7.5, or 8.2
of EN 60079-0.
8.2 For Group II, the RJ45 connectors shall be fitted with either a plug or blanking
plug.Alternatively, the module shall be mounted in an enclosure providing a degree
of protection of at least IP20.
This shall be in accordance with EN 60529, and the modules installed in a manner
that does not impair the existing creepage and clearance distances. The enclosure
shall also comply with the appropriate requirements of Clauses 7.4.2 and 7.5, or 8.3
of EN 60079-0.
8.3 For Group III, the module shall be mounted inside a suitably certified enclosure
which provides a minimum degree of protection of at least IP54. The module shall
be installed in a manner that does not impair the existing creepage and clearance
distances.
8.4 The supply to the modules must be derived from a suitably certified, intrinsically
safe supply.
8.5 The values of Co and Lo shall apply when one of the two conditions below is
given:
- The total Li of the external circuit (excluding the cable) is < 1% of the Lo value, or
- The total Ci of the external circuit (excluding the cable) is < 1% of the Co value.
The above parameters are reduced to 50% when both of the two conditions below
are given:
- The total Li of the external circuit (excluding the cable) > 1% of the Lo, and
- The total Ci of the external circuit (excluding the cable) > 1% of the Co.
Note: the reduced capacitance of the external circuit (including cable) shall not be
greater than 1µF for Group I and IIB/III and 600 nF for IIC.
8.6 The equipment shall be mounted on an earthed metal bracket or housing.
Marking
Each device is marked in accordance with the Directive and CE marked with the
Notified Body Identification Number.
9479-ETG-CSL Product Label

8INM 9479-ET(G)-CSL Rev 1
10 Specification
Power supplies
12VDC IS Power Supply Input
PoExTM (Power over IS Ethernet)
Typically 12V @ 300mA (Inrush < 400mA)
Ui =15.4V
9492-PS-PLUS recommended
Ethernet
Intrinsically Safe 10/100/1000Base-T
Connector
RJ45 (x2)
Cable Length
Up to 100m Cat5e
WLAN
TX Output – 802.11n
2.4GHz: 18 to 20.5 dBm
5GHz: 15 to 18 dBm
(per antenna output in 2T/2R mode)
RX Sensitivity – 802.11n
2.4GHz:-92 to-73 dBm
5GHz:-96 to-72 dBm
Data Rates
802.11n : up to 300Mbps (2T/2R)
802.11a/h : 6 to 54Mbps
802.11b : 1 to 11Mbps
802.11g : 1 to 54Mbps
Security – AP Mode
WEP, WPA-PSK, WPA2-PSK, WPA/WPA2,
SSID visibility status
Security – Client/Bridge Mode
WEP, WPA-PSK, WPA2-PSK, WPA/WPA2,
AES/TKIP/WEP by hardware encryption
ANTENNA CONNECTIONS
Connector (Top Port MAIN, Bottom Port AUX)
SMA (MAIN)
SMA (AUX)

9INM 9479-ET(G)-CSL Rev 1
11 APPROVALS
Location of Unit
Zone 1, IIBT4 hazardous area (9479-ETG)
Zone 1, IICT4 hazardous area (9479-ET)
Certification Code
Ex ia IIBT4 Ga (9479-ETG)
Ex ia IICT4 Ga (9479-ET)
Ex ia [ia Da] IIIC T135°C Db (non-mining)
Ex ia I Ma (M1 mining)
Ta = -40ºC to +70ºC
Certificate numbers
ATEX (CML 19ATEX2414X)
IECEx (IECEx CML 19.0150X)
QLD (IECEx ExTC 20.0019X)
See certificates for further information

10 INM 9479-ET(G)-CSL Rev 1
12 Network Setup
To begin configuring the unit, the Default IP Address is 192.168.1.253
This page displays the current network configuration.
Click the ADD NETWORK button to create a new IP network.
Click the REMOVE button under the ‘action’ heading to remove the selected network.
Click the EDIT button under the ‘action’ heading to open the network configuration
page.
12.1 Network Configuration
Once you have clicked the EDIT button, you will see the network configuration page,
here you can set all the information about your network.

11 INM 9479-ET(G)-CSL Rev 1
General Setup:
Enable Interface: Tick this box to enable the selected network interface.
Network Description: This entry is to provide an identification to your network
Protocol: Choose DHCP if you have a DHCP server in the network and you want to
assign an IP address to the AP. Choose Static if you do not have a DHCP server in the
network or if you need a fixed address to the interface.
*Note – You cannot choose DHCP if you have enabled the DHCP server option on the
DHCP page; the AP cannot be both a DHCP client and a DHCP server.
IPv4 Address: Only available in static mode. The IP address of the AP on the local
network. Assign any unused IP address in the range of IP addresses available for the
LAN
IPv4 Netmask: The subnet mask of the LAN
Default IPv4 gateway: The IP address of the router on the local area network.
DNS Server(s): The IP addresses of the DNS server(s) you want to use.
If you selected the DHCP protocol, you can choose to use the value defined in the
menu TOOLS/System, or you can define a new HOSTNAME, specific to this network.
Interfaces Setting:
Bridge Interfaces: If checked, all interfaces in this network are linking with the
software equivalent of an Ethernet switch.
Enable STP/RSTP: If checked the STP/RSTP will be activated on this bridge. If you
choose to not use STP/RSTP, you have to set up your devices to avoid network loops,
by yourself.
Enable LLDP Forwarding: Check this box if the internal bridge must forward the
LLDP multicast frame.
Bridge VLAN: Enable VLAN management in the bridge.
Interface: This is the list of available network interfaces. Disabled (greyed) interfaces
are already used in another network. For Bridge networks, select all the interfaces you
want to bridge together in to the LAN being configured. For simple networks, select
the one interface to configure.
Advanced Settings:

12 INM 9479-ET(G)-CSL Rev 1
Network Persistence: When this option is enabled, the IP setting (routes, gateway,
virtual interfaces) remains persistent when the physical interface loses its connection.
Default value is enabled for static IP, and disabled for DHCP.
13 Wi-Fi Setup
This page allows the user to configure the wireless
network settings, by default the radio will be disabled
and you will need to turn in on.
Country: The regulation rules of the selected country will determine the channels and
transmission powers you can use. Additionally, in the client role, the product will use
the country provided by the AP in its beacons.
Under the ‘actions’ heading, you can click the buttons ‘EDIT’ and ‘REMOVE’.
Click REMOVE to remove the selected SSID.
Click EDIT to open the radio windows and edit this SSID’s Properties.

13 INM 9479-ET(G)-CSL Rev 1
Device Configuration:
General Setup:
This selection gathers all the settings that are common to each SSID you may create
on this radio.
Enable Device: If this box is checked, the radio card is enabled and is able to
communicate. Uncheck it to disable the radio.
802.11 Mode:
The 802.11g+n mode operates in the 2.4GHz band and is compatible with 802.11g and
802.11n devices.
The 802.11a+n mode operates in the 5GHz band and is compatible with 802.11a/h and
802.11n devices.
The 802.11ac+n mode operates in the 5GHz band and is compatible with 802.11ac,
802.11a/h and 802.11n devices.
*Note – A unit configured in 802.11ac+n/802.11a+n cannot communicate with another
one configured in 802.11g+n mode because they are using different frequency ranges.
HT (high throughput) mode: In HT mode, you can aggregate adjacent channels (2
in 802.11n, 2 or 4 in 802.11ac) in order to increase bandwidth. One of the channels is
the one selected in the channel section (see below). The second one may be the one
directly below or directly above. If you choose 20MHz, only one channel will be used
at a time.
Automatic channel select (ACS): Depending on the unit role, the channel can be
selected automatically;
AP Role: At start up, the AP will select the channel among all the ones allowed in your
country. In order to limit the choice to specific channels, do not check ACS, but use the
channels multi-selection box instead.
Client Role:The client will scan all channels allowed in your country. In order to limit the
channel scan list, do not check ACS, but use the channels multi-selection box instead.
If the client is set in roaming mode, this channel list is superseded by the one in the
roaming tab.

14 INM 9479-ET(G)-CSL Rev 1
Other Roles: The other roles, (mesh portal, ad-hoc) support only one channel, this
parameter is not available and you must select a channel in the dropdown box.
Channel: According the selected 802.11 mode and the regulation rules of the selected
country, a list of channels is available for selection. This is not used for infrastructure
client modes, as they use all the allowed channels for scanning.
In some cases, a single radio card can handle multiple Wi-Fi roles simultaneously. In
this case and ‘client’ function must be set to only scan the common channel.
You can select several channels so that the AP will select the cleanest one and will be
able to switch to another if a radar is detected on the current one. To select multiple
channels, use Ctrl + click.
Advanced Settings
Max Transmit Power: The transmit power is normally set automatically based on the
regulation rules for the given channel and the capabilities of the radio card. This option
sets an upper bound on the transmit power.The transmit power is distributed between
the configured antennas.
Antennas: NOTE: Improved RX signal strength and full TX power is achieved only
buy using two antennas and selecting "All" for this option. Both are also required for
802.11n MIMO mode. For single antenna use select "Only #1" and connect the antenna
to the AUX socket, however performance will be reduced with a single antenna.
Qos Profile: This option allows choosing between the two Qos profiles.
Distance optimization: Use this option if your link covers a long distance, it will
update the internal timeouts.
Beacon interval: This option allows configuring the interval between two beacon
frames.
Fragmentation threshold: This option configures the maximum 802.11 frame size in
802.11a/b/g mode in bytes. Frames that exceed this threshold are fragmented.
RTS/CTS threshold: The Wi-Fi standard uses the RTS/CTS protocol to avoid collision
in the air; this option defines the size of the frames subject to this protection. Use RTS/
CTS when you have interference on your channel or a poor performance on the Wi-Fi.
Retry settings: Unicast data frames are normally acknowledged. If the transmitter
does not receive the acknowledgment, it must resend the frame. In 802.11n mode,
several frames can be aggregated into one big frame called an A-MPDU. Independent
frames are acknowledged by an individual ACK frame, while A-MPDU frames are
acknowledged by a single ‘Block acknowledge’ frame containing one acknowledgment
for each subframe in the A-MPDU. When you check this option, you can set the
number of retries.

15 INM 9479-ET(G)-CSL Rev 1
Short Retry: This is the number of retries for a physical data frame.
Long Retry: This is the number of retries for a physical data frame sent with the RTS/
CTS protocol
Aggregate Retry: This option configures the number of retries for a frame aggregated
into an A-MPDU.
Interface Configuration:
This section is duplicated for each SSID; settings only apply to the selected SSID.
General setup:
Role: The unit has the following supported roles;
- Access Point
- Isolating access point
- Client (connecting at an access point)
- Mesh 802.11s
- Point to multipoint station (ad-hoc)
- SRCC
ESSID: This is the Wireless network name.
Maximum association: Specifies the maximum number of clients allowed to connect
on the Access Point.
Hide ESSID: This option allows you to not broadcast the SSID on the network. This
means that your clients will need to know the SSID beforehand, since scanning will
not real this SSID on the AP.
Network: This option allows selecting the network where the interface is added.
Mesh ID (only in mess mode): This option replaces the ESSID when the Mesh mode
is selected.
General setup client mode:
Multiple ESSIDs: When this is checked, a multi-selection field, (Wireless network
nicknames), replaces the single ESSID field. You can select several SSIDs with their
security parameters and the client will associate to any AP advertising one of the
combination. In case several matching APs are in range, you can prioritize the SSIDs.
When using multiple ESSIDs, the roaming features are not available; the security is
defined together with the corresponding ESSID in a separate menu.
Wireless Security:
This menu allows you to choose the type of wireless security you want to apply on this
SSID. The different security schemes are;
- No Encryption
- WEP Open System
- WEP Shared Key
- WPA-PSK
- WPA2-PSK
- WPA-PSK/WPA2-PSK Mixed Mode
- WPA-EAP
- WPA2-EAP
- WPA-LEAP
- WPA2-LEAP
Depending on which security option you choose, a range of options will appear that
you must configure.

16 INM 9479-ET(G)-CSL Rev 1
14 DHCP Server
General Setup:
Ignore interface: If checked, the DHCP server will be disabled on the selected
interface.
DHCP pool first address (if enabled): First IP Address of the DHCP pool. This is
interpreted as an offset relative to network address.
DHCP pool size (if enabled): Maximum number of leased addresses.
Lease time (if enabled): This represents the time during which a given IP Address
remains valid. After that time, the client needs to renew his lease.