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On IEEE 802.11n, a mode with a channel width of forty MHz is specified. This just isn't channel bonding, but a single channel with double the older 20 MHz channel width, thus using two adjacent 20 MHz bands. This allows direct doubling of the PHY information fee from a single 20 MHz channel. Most backbone installations install extra cabling or fiber optic pairs than is initially needed. This is finished as a outcome of labor costs are greater than the worth of the cable, and operating extra cable reduces future labor costs if networking needs change. Link agg