Power Specifications - Siemens SCALANCE W788-1PRO Operating Instructions Manual

Power Specifications

Specifying Power in dBm
A commonly used reference variable in wireless technology is a power of 1 mW.
Power can then be specified in the decibel milliwatt unit (dBm). The following
formula is used:
P [dBm] = 10 * log (P [mW] / 1 mW)
This results in the following power specifications in dBm:
0.5 mW
1 mW
2 mW
4 mW
10 mW
100 mW
200 mW
1 W
Using power specifications, it is simple to calculate gain and attenuation. To
calculate an entire system, the individual values for gain and attenuation must
simply be added.
Transmit Power dBm
The information in the following tables applies to the following SIMATIC NET
products:
● Access point SCALANCE W788-1PRO, W788-2PRO, W788-1RR, W788-2RR
● Client module SCALANCE W744-1PRO, W746-1PRO, W747-1RR
● IWLAN/PB Link
Transmit Power in IEEE 802.11b Mode (2.4 GHz)
Operating Instructions SCALANCE W78x
C79000-G8976-C184-07
≈ -3 dBm
= 0 dBm
≈ 3 dBm
≈ 6 dBm
≈ 10 dBm
≈ 20 dBm
≈ 23 dBm
≈ 30 dBm
Data rate [Mb/s]
1
2
5.5
11
Appendix
P 0 [dBm]
18
18
18
18
262