AWG stands for American Wire Gauge. This is something interesting that I learned today (at least what the abbreviation means).
In terms of networking it represents the wire diameter of an Ethernet cable or probably any cable. Contrary to expectations, the higher the number the thinner the wire is. There are also a bunch of characteristics related to it that I don't understand.
It has a total of 44 possible values (1-40, plus 0, 00, 000 & 0000) and according the TIA 568-C.2 standard Ethernet patch cables should consist of four balanced twisted-pairs of 22 AWG to 26 AWG (0.64516mm to 0.40386mm) solid or stranded conductors.
I'm wondering if smaller or bigger values are better. Is the signal better, or the tension higher, and what's the importance of characteristics such as:
+-----+------------------+-------+-----------------------+-------------+-------------+
| | Diameter | Area | Resistance | Max Current | Max Freq. |
| AWG |------------------+-------+-----------------------+-------------| for 100% |
| | [in.] | [mm] | [mm²] | [Ω/1000ft] | [Ω/km] | [Amperes] | skin depth |
+-----+--------+---------+-------+------------+----------+-------------+-------------+
| 21 | 0.0285 | 0.7239 | 0.41 | 12.8 | 41.984 | 1.2 | 33 kHz |
| 22 | 0.0254 | 0.64516 | 0.326 | 16.14 | 52.9392 | 0.92 | 42 kHz |
| 23 | 0.0226 | 0.57404 | 0.258 | 20.36 | 66.7808 | 0.729 | 53 kHz |
| 24 | 0.0201 | 0.51054 | 0.205 | 25.67 | 84.1976 | 0.577 | 68 kHz |
| 25 | 0.0179 | 0.45466 | 0.162 | 32.37 | 106.1736 | 0.457 | 85 kHz |
| 26 | 0.0159 | 0.40386 | 0.129 | 40.81 | 133.8568 | 0.361 | 107 kHz |
| 27 | 0.0142 | 0.36068 | 0.102 | 51.47 | 168.8216 | 0.288 | 130 kHz |
+-----+--------+---------+-------+------------+----------+-------------+-------------+
Where I live, I only see cables rated AWG23, AWG24, AWG26, AWG26/7. Not sure what to pick because I have no idea what the differences are.
Is there a right diameter for a specific situation?
Conduit, signal resistance, ohmic resistance (DC), impedance (AC), Power over Ethernet - how are these things related and how do they influence the network and the devices I am using.
Basically, how do I know which AWG is the best?