3Com 3C10220 manual 10/100BASE-TX Data and Power Output Ports, LED Behavior

12CHAPTER 1: 3COM ETHERNET POWER SOURCE OVERVIEW

10/100BASE-TX

Data and Power

Output Ports

The EPS output ports (top row) carry two kinds of transmissions:

■Ethernet data on the standard two wire pairs on an RJ-45 connector (Transmit on pins 1 and 2; Receive on pins 3 and 6)

and

■DC power on the previously unused wire pairs of the RJ-45 connector (-24VDC Return on pins 4 and 5 and -24VDCon pins 7 and 8)

The maximum segment length from the switch or hub to the Network Interface Card (NIC), including the EPS, is 100 m (328 ft.) using Category 5 twisted pair cable.

LEDs lists the lights (LEDs) on the front of the EPS and their states. For information on using the LEDs for problem solving, see “Solving EPS Problems” in Chapter 3.

Table 3 LED Behavior

Per-port Status Indications

Visual Indications (for Each Port) Port Status

Yellow LED	Green LED	Note: Do not automatically assume that a
		yellow LED indicates a problem. For example, if
		the yellow LED for any port is ON, the EPS is
		not supplying power to that port/device, which
		may indicate that the device is not capable of
		accepting power via its Ethernet connection.
Off	On	■ Normal condition. Port power is turned on
		and a device is drawing power from the
		port.
Off	Off	■ Main power supply is off.
		or
		■ Port power is turned off.
		or
		■ Both main power and port power are on,
		but no device cable is plugged into the
		port.
On	Off	■ Either the device that is plugged into the
		port is incapable of accepting power via its
		Ethernet connection, or it has attempted to
		draw too much power from the port. The
		EPS has shut off the port power.
On	On	■ An internal fault has occurred on this port.
		The EPS has shut off the port power.