Wifi

Connected Devices

• See “Network Map”
• See “DHCP Client List”

Router Modes

• Router
• Access Point (AP)
  • Extends network from wired connection
• Repeater (RE)
  • Extends network wirelessly

Router mode	Access Point mode
Each router has different subnet	Uses single subnet
need to login to each router to change settings	manageability is easy, one router settings need to be changed
Has Firewall	No Firewall
Has DHCP Service running	No DHCP service

Setup NAT

• Can be used to expose local server to internet
• See “Forwarding” option

Wifi Signal

dBm

• decibel-milliwatts
• Logarithmic unit of Power level
• Relative to 1 milliwatt (mW)
  • dBm > 0 indicates power greater than 1 mW
  • dBm < 0 indicates power less than 1 mW
• dB (decibels) and dBm (decibels-milliwatts) is a dimensionless unit
• For Power $P$ in mW the following expression calculates it in dBm

$$10\ast {\log }_{10}(P/1\text{mW})$$

Received signal strength indication

• aka RSSI
• Range: -100 dBm to 0 dBm
• Signal is good when close to 0 dBm
• Indication
  • Poor: RSSI < -90 dBm
  • Fairly Strong: -90 dBm < RSSI < -67 dBm
  • Very Strong: -67 dBm < RSSI < -30 dBm
  • Maximum: -30 < RSSI

Noise

• Range: -120 dBm to 0 dBm
• Low Interference, Signal is good when close to -120 dBm

Signal to Noise Ratio

• aka SNR
• SNR = RSSI - Noise
• Units: dB
• Indication
  • Good: 20 dB < SNR
  • Moderate: 10 dB < SNR < 20 dB
  • Poor: SNR < 10 dB

	RSSI	Noise	SNR	Indication
Airtel_5G	-81	-92	11	Moderate
Airtel	-69	-93	24	Good
TP-Link_5G	-59	-90	31	Good
TP-Link	-61	-93	32	Good