3Com DUA1647-7AAA01 manual Installing The Switch, Rear Panel Connections, Positioning the Switch

Priority Level	Traffic Type
0	Best Effort
1	Background
2	Standard (spare)
3	Excellent Effort (business critical)
4	Controlled Load (streaming multimedia)
5	Video (Interactive media), less than 100 milliseconds
	latency and jitter.
6	Voice (Interactive voice), less than 10 milliseconds
	latency and jitter.
7	Network Control Reserved traffic

The traffic prioritization feature supported by the Switch is compatible with the relevant sections of the IEEE 802.1D standard (incorporating IEEE 802.1p).

2Activity/Link/Speed Status LEDs

The top row of Status LEDs, labelled “Link/Activity,” show the link and activity status of the related ports:

Status	Meaning
On	The link has been established.
Flashing	Packets are being received or transmitted on the port.
Off	If the link has not been established, either nothing is con-
	nected to the port, or there is a problem:

■Check that the attached device is powered on.

■Check that the cable is the correct type and is not faulty.

If these checks do not identify the cause of the problem, it may be that the unit or the device connected to the port is faulty. Contact your supplier for further advice.

Green	The link is operating at 1000 Mbps.
Yellow	The link is operating at 10 or 100 Mbps.

3Duplex Status LEDs

The second row of Status LEDs, which are colored yellow, show the duplex status of the related ports:

Status	Meaning
On Yellow	The port is operating in full duplex mode.
Off	The port is operating in half duplex mode.

1000BASE-T only operates in full duplex mode. 10BASE-T/100BASE-TX can be in half or full duplex mode.

4Power LED

The Power LED shows the power status of the Switch:

Status	Meaning
On Green	The unit is powered on and ready for use.
Off	■	The unit is not receiving power:
	■	Check that the power cord is connected correctly.
	■	If the unit still does not operate, contact your supplier.

Rear Panel Connections

5Power Supply

The Baseline 8 Port Gigabit Switch automatically adjusts to the supply voltage. Only use the power cord that is supplied with the unit.

INSTALLING THE SWITCH

Positioning the Switch

When deciding where to position the Baseline 8 Port Gigabit Switch ensure:

„It is accessible and cables can be connected easily.

„Cabling is away from sources of electrical noise. These include lift shafts, microwave ovens, and air conditioning units. Electromagnetic fields can interfere with the signals on copper cabling and introduce errors, therefore slowing down your network.

„Water or moisture cannot enter the case of the unit.

„Air flow around the unit and through the vents in the side of the case is not restricted (3Com recommends that you provide a minimum of 25 mm (1 in.) clearance).

„The air is as free from dust as possible.

„Temperature operating limits are not likely to be exceeded. It is recommended that the unit is installed in a clean, air conditioned environment.

It is always good practice to wear an anti-static wrist strap when installing network equipment, connected to a ground point. If one is not available, try to keep in contact with a grounded rack and avoid touching the unit's ports and connectors, if possible. Static discharge can cause reliability problems in your equipment.

Rack Mounting or Free Standing

This unit can be mounted in a 19-inch equipment rack using the Mounting Kit. Refer to “Mounting Kit Instructions” on page 4. It can also be free standing. Do not place objects on top of the unit or stack.

The unit is supplied with four self-adhesive rubber pads. If the unit is to be part of a free standing stack, apply the pads to each marked corner area on the underside of the unit. Place the unit on top of the lower unit, ensuring that the pads locate with the recesses of the lower unit.

Do not apply the pads if you intend to rack mount the unit.

CAUTION: If installing the Baseline 8 Port Gigabit Switch in a free standing stack of different size SuperStack II or SuperStack 3 units, the smaller units must be installed above the larger ones. Do not build a free standing stack of more than six units.

3