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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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14-1. Voice Ports

  • Inline power is provided to a powered device as follows:

    - A phantom-powered device can be detected as a switch port becomes active.

    - A powered device loops the transmit and receive pairs back so that the switch detects its own 340 kHz test tone.

    - Power is applied to the port if the device is present; no power is applied if a normal Ethernet device is connected.

    - Inline power is provided over pairs 2 and 3 (RJ-45 pins 1,2 and 3,6) at 48V DC.

  • Inline power is available on the following switch modules:

    - Catalyst 6000 Inline Power 48-port 10/100 Ethernet Switch Module (WS-X6348-RJ45V)

    - Catalyst 4000 Inline Power 48-port 10/100 Ethernet Switch Module (WS-X4148-RJ45V), with auxiliary DC power shelf and power entry module

    - Catalyst 3524XL ...

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