The IEEE standard for a broadband LAN, 10Broad36 derives multiple channels through frequency division multiplexing (FDM). The aggregate bandwidth is 550 MHz and the FDM channels are 14 MHz wide, with 4 MHz guardbands. The modulation technique is differential phase shift keying (DPSK).The total span is a maximum of 3600 meters, and can be divided into multiple segments, each with a maximum distance of 1800 meters. 10Broad36 is considered obsolete. See also bandwidth, broadband, channel, DPSK, FDM, guard band, IEEE, LAN, and modulation.