Please refer to the Solutions below if you are experiencing an Abnormal Data Error:


  1. Reset the Devices, Main Terminal and Mobile Terminals.
  2. Activate the Guided Access Setting within the Device.


Should the Error persist, the cause may be one of the following below:


Possible Causes
Description
Solutions
Outdated Hardware
  • Attempting to run Apps that require Power and Processing Capacities greater than the Hardware can provide.
  • Upgrade Hardware.
  • TroubleShoot Hardware.
Outdated Software
  • Utilising Outdated ARMS F&B Main Terminal / Mobile Terminal App Versions.
  • Upgrade the App.
High Utilization / Speed Mismatch
  • Excessive amount of active Wireless Network Users.
  • Excessive amount of Users accessing the same Router simultaneously.
  • Create separate Networks for both Customer and App usage.
  • Utilise an external Router for App usage.
Poor Cable Quality / Network Design
  • Network Cable is unable to handle high Network speeds.
  • Poor Network design causing poor performance.
  • Substandard Wired Equipment (Devices & Cabling).
  • Bad / Failed Access Points.
  • Inspect for faulty Cable / Devices.
  • Inspect applicable Access Points for broken antennas, status lights indicating faulty conditions and insufficient electrical power. 
  • Reboot Access Points.
  • Update Device Firmware.
Coverage Hole / Wireless Signal Interference
  • Setup was conducted without a RF Site Survey, resulting in substandard coverage.
  • Additional Changes within the Setup Location have altered RF Signal Propagation.
  • Indications of Low Signal Level (less than -75dBm) and High Retry Rates (greater than 10 percent), regardless of noise levels.
  • Low Signals cause the Radio Card Receiver to experience difficulties in recovering data, triggering retransmissions, excessive overhead, and low throughput.
  • Replacing existing Antennas with Higher Gain Antennas.
  • Move Access Points to a higher / unobstructed location. 
  • Perform a periodic RF Site Survey to detect unexpected coverage holes, preferably every few months.
  • Test WiFi Signal strength (e.g Use app -> Dr. Wifi: Speed & Signal Test). Refer to the WiFi Signal Strength Chart below.


Wifi Signal Strength Chart

Note: The values in the chart below are suggestions. Depending on the requirements of a real-life network the desired WiFi signal strength will vary.


Signal Strength
Status
Description
> -50 dBm
Excellent
Signal strength of this range are considered as outstanding.
-50 dBm to -60 dBm
Good
Signal strength of this range are sufficient for tasks of any level.
-60 dBm to -70 dBm
Fair
Minimum Signal strength range for any service dependant on a steady connection and signal strength (e.g. voice over Wi-Fi or non-HD video streaming).
< -70 dBm
Weak
Signal strength is considered unreliable and will not suffice for most services.