A powered telecommunications system (100; 200; 500; 700; 800), comprising: a first powered device (102; 202; 502; 702; 802) including: a first powered device port unit (142; 242; 541, 543; 741; 841) configured to negotiate receipt of power from power sourcing equipment (102; 202; 502; 702; 802) on a first pair of taps (136; 536; 736; 836); a base power load (146; 246; 546; 746; 846) coupled with the first powered device port unit (142; 242; 541, 543; 741; 841) and configured to receive power therefrom; a second pair of taps (138; 538; 738; 838) coupled for receipt of power from the power sourcing equipment (102; 202; 502; 702; 802), the second pair of taps (138; 538; 738; 838) connected with a pass-through port (164; 564; 764; 864) of the first powered device (102; 202; 502; 702; 802); a second powered device (106; 206; 506; 706; 806) including: a second powered device port unit (182; 282; 582; 782; 882) configured to negotiate receipt of power from power sourcing equipment (102; 202; 502; 702; 802) via the pass-through port (164; 564; 764; 864) of the first powered device (102; 202; 502; 702; 802); an optional power load (186; 286; 586; 786; 886) coupled with the second powered device port unit (182; 282; 582; 782; 882) and configured to receive power therefrom; and, a powered cable pair (172; 572; 772; 872) coupled with the pass through-port for connecting the second pair of taps (138; 538; 738; 838) and the power sourcing equipment (102; 202; 502; 702; 802) with the second powered device port unit (182; 282; 582; 782; 882) to deliver power to the optional power load (186; 286; 586; 786; 886). a first powered device (102; 202; 502; 702; 802) including: a first powered device port unit (142; 242; 541, 543; 741; 841) configured to negotiate receipt of power from power sourcing equipment (102; 202; 502; 702; 802) on a first pair of taps (136; 536; 736; 836); a base power load (146; 246; 546; 746; 846) coupled with the first powered device port unit (142; 242; 541, 543; 741; 841) and configured to receive power therefrom; a second pair of taps (138; 538; 738; 838) coupled for receipt of power from the power sourcing equipment (102; 202; 502; 702; 802), the second pair of taps (138; 538; 738; 838) connected with a pass-through port (164; 564; 764; 864) of the first powered device (102; 202; 502; 702; 802); a first powered device port unit (142; 242; 541, 543; 741; 841) configured to negotiate receipt of power from power sourcing equipment (102; 202; 502; 702; 802) on a first pair of taps (136; 536; 736; 836); a base power load (146; 246; 546; 746; 846) coupled with the first powered device port unit (142; 242; 541, 543; 741; 841) and configured to receive power therefrom; a second pair of taps (138; 538; 738; 838) coupled for receipt of power from the power sourcing equipment (102; 202; 502; 702; 802), the second pair of taps (138; 538; 738; 838) connected with a pass-through port (164; 564; 764; 864) of the first powered device (102; 202; 502; 702; 802); a second powered device (106; 206; 506; 706; 806) including: a second powered device port unit (182; 282; 582; 782; 882) configured to negotiate receipt of power from power sourcing equipment (102; 202; 502; 702; 802) via the pass-through port (164; 564; 764; 864) of the first powered device (102; 202; 502; 702; 802); an optional power load (186; 286; 586; 786; 886) coupled with the second powered device port unit (182; 282; 582; 782; 882) and configured to receive power therefrom; and, a powered cable pair (172; 572; 772; 872) coupled with the pass through-port for connecting the second pair of taps (138; 538; 738; 838) and the power sourcing equipment (102; 202; 502; 702; 802) with the second powered device port unit (182; 282; 582; 782; 882) to deliver power to the optional power load (186; 286; 586; 786; 886). a second powered device port unit (182; 282; 582; 782; 882) configured to negotiate receipt of power from power sourcing equipment (102; 202; 502; 702; 802) via the pass-through port (164; 564; 764; 864) of the first powered device (102; 202; 502; 702; 802); an optional power load (186; 286; 586; 786; 886) coupled with the second powered device port unit (182; 282; 582; 782; 882) and configured to receive power therefrom; and, a powered cable pair (172; 572; 772; 872) coupled with the pass through-port for connecting the second pair of taps (138; 538; 738; 838) and the power sourcing equipment (102; 202; 502; 702; 802) with the second powered device port unit (182; 282; 582; 782; 882) to deliver power to the optional power load (186; 286; 586; 786; 886).