Frequently Asked Questions
From Deliberant wiki
Contents |
Getting Started
Default IP Address
The default IP address is 192.168.2.66 with a subnet mask of 255.255.255.0
Default administrator login
The default username is admin and the default password is admin01
General
Resetting to defaults via Ping
Devices that are missing reset to factory defaults settings button (or due to housing button is not accessible without disassembling the housing first) need functionality that allows easily reseting device to default settings.
During startup of a device, when drivers of ethernet interfaces are loaded, the discovery daemon is started. The daemon suspends startup process for 3 seconds and waits for ICMP "echo request" packet of length 369 bytes. If the packet received, the discoveryd resets the device to default configuration.
Steps to reset to default settings (for linux users):
Step 1. Power off the device.
Step 2. Obtain the device MAC address.
Step 3. Connect a PC to the same physical subnet as the device. (Note, it is usually easier to use a switch between the radio and the computer)
Step 4. Execute 'arp -s' command to assign the IP address (IP address should be from the same subnet as PC) to the device MAC address:
arp -s <IP address to assign> <device MAC address>
Step 5. Start pinging the device:
ping <IP address> -s 369
- for windows users:
ping <IP address> -l 369 -t -w 200
Step 6. Power up device and wait about 1 minute or more (depends from device hardware).
Step 7. Stop pinging the device, and let the device boot as usual. Device should come back with defaults settings.
Hardware
Antenna Connector Layouts
Connector diagrams for multiple radio devices:
DLB AP Duo
DLB AP Quad
Wireless
Recommended ACK Timeout Setting
802.11 radios have an ACK Timeout setting (acknowledgement timeout) where if the transmitting radio doesn’t get a response from the receiving radio within a certain timeframe it will assume the packets have been lost and retransmit the packets. If you have long range links, the time to send a message and then get a response back will increase and may exceed the standard ACK timeout settings. On long-range links, increasing this setting will reduce retransmits and improve the quality of the link. However, at the same time, if you have short links and your ACK settings are too high, if a packet gets lost in transit, the sender will wait longer to retransmit than usual which will degrade the link unnecessarily.
 | The formula to determine a baseline ACK setting is: ACK = 23 + (Distance in meters / 150) |
 | This is just a guideline, and adjustments may need to be made depending on environment. |
ACK Timeout Lookup Table
| Miles | Kilometers | ACK Setting |
| 1 | 1.6 | 34 |
| 2 | 3.2 | 44 |
| 3 | 4.8 | 55 |
| 4 | 6.4 | 66 |
| 5 | 8 | 77 |
| 6 | 9.7 | 87 |
| 7 | 11.3 | 98 |
| 8 | 12.9 | 109 |
| 9 | 14.5 | 120 |
| 10 | 16.1 | 130 |
| 11 | 17.7 | 141 |
| 12 | 19.3 | 152 |
| 13 | 20.9 | 162 |
| 14 | 22.5 | 173 |
| 15 | 24.1 | 184 |
| 16 | 25.7 | 195 |
| 17 | 27.4 | 205 |
| 18 | 29.0 | 216 |
| 19 | 30.6 | 227 |
| 20 | 32.2 | 238 |
| 21 | 33.8 | 248 |
| 22 | 35.4 | 259 |
| 23 | 37.0 | 270 |
| 24 | 38.6 | 280 |
| 25 | 40.2 | 291 |
| 26 | 41.8 | 302 |
| 27 | 43.5 | 313 |
| 28 | 45.1 | 323 |
| 29 | 46.7 | 334 |
| 30 | 48.3 | 345 |
RSSI Values Explained
For an explanation on RSSI Values and what to look for, see our WIKI entry:
http://wiki.deliberant.com/index.php/Understanding_RSSI_Values
How to change between the internal and external antennas on the DLB CPE products
The Deliberant CPE products have two antenna options, a built in panel antenna, and an external n-connector. By default the integrated panel antenna is activated. In order to switch between the integrated antenna and the external n-connector, the configuration must be modified in the Wireless section:
http://wiki.deliberant.com/index.php/DLB_CPE_Configuration_Manual#Wireless
In the wireless section, there is a drop down for Antenna which provides two options: internal and external
