3Com 3C16470, 3C16471 operation manual

SuperStack® 3 Baseline 10/100 Switch 16-Port (3C16470) and 24-Port (3C16471) User Guide

DUA1647-0AAA01

INTRODUCTION

The SuperStack® 3 Baseline 10/100 Switch is a versatile, easy-to-use unmanaged switch. It is ideal for users who want the high-speed performance of 10/100 switching but do not need sophisticated management capabilities. The Baseline 10/100 Switch is shipped ready for use. No configuration is necessary.

The Baseline 10/100 Switch has 16 or 24 shielded RJ-45, 10/100 Mbps auto-negotiating ports on the front panel. Each port automatically determines the speed and duplex mode of the connected equipment and provides a suitable switched connection. Each port also supports automatic MDI/MDI-X detection.

The Baseline 10/100 Switch is suited for office use where it can be free standing, or rack mounted (in a wiring closet or equipment room).

The Baseline 10/100 Switch comes with:

 One power cord for use with the Baseline 10/100 Switch  Four self-adhesive rubber pads  One mounting kit

The Switch is powered from the AC mains supply.

The diagram below shows an sample configuration:

Endstations on shared

Baseline Hub

Baseline Dual Speed Hub

100Mbps connection to backbone

Baseline 10/100 Switch

10Mbps connections

Endstations on shared 100Mbps connections

Endstations on switched 10Mbps connections

100Mbps link10Mbps link

The Baseline 10/100 Switch provides high performance switched connections to 10 Mbps and 100 Mbps hubs, servers and workstations that require a dedicated switched link.

HOW TO USE THE BASELINE 10/100 SWITCH

21 24

Numbered elements in this diagram refer to numbered sections in the text. A 24-port unit is shown.

Front Panel

1 24 RJ-45 10/100 Ports

WARNING

sockets. They cannot be used as standard traditional telephone sockets, or to connect the unit to a traditional PBX or public telephone network. Only connect RJ-45 data connectors, network telephony systems, or network telephones to these sockets. Either shielded or unshielded data cables with shielded or unshielded jacks can be connected to these data sockets. AVERTISSEMENT: Les ports RJ-45. Ceux-ci sont protégés par des prises de données. Ils ne peuvent pas être utilisés comme prises de téléphone conventionnelles standard, ni pour la connection de l’unité à un réseau téléphonique central privé ou public. Raccorder seulement connecteurs de données RJ-45, systèmes de réseaux de téléphonie ou téléphones de réseaux à ces prises. Il est possible de raccorder des câbles protégés ou non protégés avec des jacks protégés ou non protégés à ces prises de don. WARNUNG: RJ-45-Porte. Diese Porte sind geschützte Datensteckdosen. Sie dürfen weder wie normale traditionelle Telefonsteckdosen noch für die Verbindung der Einheit mit einem traditionellem privatem oder öffentlichem Telefonnetzwerk gebraucht werden. Nur RJ-45-Datenanscluße, Telefonnetzsysteme or Netztelefone an diese Steckdosen anschließen. Entweder geschützte oder ungeschützte Buchsen dürfen an diese Datensteckdosen angeschlossen werden.

10BASE-T/100BASE-TX Ports

The Baseline 10/100 Switch has 16 (3C16470) or 24 (3C16471) 10/100 Mbps auto-negotiating ports.

To connect a device to the Baseline 10/100 Switch, use Category 5 unshielded or shielded (screened) 100 Ohm TP cable (or Category 3 cable for a 10 Mbps connection). The maximum length of cable for each connection is 100m (328ft). Connect one end of the cable to an RJ-45 port on the Baseline 10/100 Switch, and the other end to the appropriate RJ-45 port on the connecting device.

Each port on the Baseline 10/100 Switch is auto-negotiating: its speed and duplex mode (half duplex or full duplex) are automatically determined by the capabilities of the connected device.

: RJ-45 ports. These are shielded RJ-45 data

Each port supports automatic MDI/MDI-X detection and can be connected to either a 10BASE-T or a 100BASE-TX device.

The Switch offers priority queuing, which means all packets that are received are examined to see if they have been priority encoded. If a packet has been then the Switch will read the priority level and determine whether the packet should be directed through the normal or high priority channel. This feature can be useful for example during excessive loads when one type of traffic may require priority over another. The Switch is configured to comply with 802.1p, VLAN tagged frames.

Traffic prioritization ensures that high priority data is forwarded through the Switch without being delayed by lower priority data. It differentiates traffic into classes and prioritizes those classes automatically. Traffic prioritization uses the multiple traffic queues that are present in the hardware of the Switch to ensure that high priority traffic is forwarded on a different queue from lower priority traffic, and is given preference over that traffic. This ensures that time-sensitive traffic gets the highest level of service. The 802.1D standard specifies eight distinct levels of priority (0 to 7), each of which relates to a particular type of traffic. The priority levels and their traffic types are shown in the following table.

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

6 Voice (Interactive voice), less than 10

7 Network Control Reserved traffic

millisecondsn latency and jitter.

milliseconds latency and jitter.

The traffic prioritization feature supported by the Switch is compatible with the relevant sections of the IEEE

802.1D standard (incorporating IEEE 802.1p).

If you connect two Baseline 10/100 Switch units together,

the link between them operates at 100 Mbps full duplex. You must use Category 5 cable when connecting the units.

CAUTION: The Baseline 10/100 Switch supports full duplex auto-negotiation. If the connected device does not

support auto-negotiation, the Switch will operate in half duplex mode (even if the device is operating in full duplex mode). In such a configuration, you may notice some degradation of network performance. 3Com recommends that you use devices that are capable of auto-negotiation (and that you ensure that auto-negotiation is enabled, if it is a configurable option).

Activity/Link/Speed Status LEDs

The first (top) and third row of LEDs, which are colored yellow or green, show the activity and speed 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

Green The link is operating at 100 Mbps.

Yellow The link is operating at 10 Mbps.

connected 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.

Status Meaning

On Yellow The port is operating in full-duplex mode.

Off The port is operating in half-duplex mode.

Power 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 the power cord is connected correctly.

■ If the unit still does not operate, contact your supplier.

Self-adhesive Pads

The unit is supplied with four self-adhesive rubber pads.

You do not need to apply the pads if you intend to rack mount the unit.

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.

Duplex Status LEDs

The second and fourth (bottom) row of Status LEDs, which are colored yellow, show the duplex status of the related ports:

INSTALLING THE SWITCH

Positioning the Baseline 10/100 Switch

CAUTION: If installing the Baseline 10/100 Switch in a stack of different size SuperStack 3 units, the smaller

units must be installed above the larger ones. Do not have a free-standing stack of more than six units.

When deciding where to position the Baseline 10/100 Switch ensure that:

 It is accessible and cables can be connected easily.  Cabling is away from sources of electrical noise such as

radios, transmitters and broadband amplifiers, and away from power lines and fluorescent lighting fixtures.

 The Switch is situated away from sources of electrically

conductive dust, for example laser printers.

 The AC supply used by the Switch is separate to those used

by units that generate high levels of AC noise, for example air conditioning units and laser printers.

 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).

To prolong the operational life of your units:

 Never stack units more than six high if free-standing, and

ensure that cables are supported so that they do not cause the stack to fall over.

 Do not place objects on top of any unit or stack.  Do not obstruct any vents at the sides of the case.

Rear Panel Connections

6 Power Supply

The Baseline 10/100 Switch automatically adjusts to the supply voltage. Only use the power cord that is supplied with the Baseline 10/100 Switch.

Rack Mounting

The Baseline 10/100 Switch can be mounted in a 19-inch equipment rack using the Mounting Kit. Refer to “Mounting Kit Instructions” on page 5.

Power Up

Use the following sequence to power up the Baseline 10/100 Switch:

1 Check the network connections and cables. 2 Connect the power supply cable to the appropriate power

socket on the rear panel of the unit; refer to 6 Power

Supply

3 Connect the plug to the power supply outlet socket and

switch on the power supply at the socket.

When the switch is powered on, the Power LED should be lit on green. If it is not, refer to 4 Power LED.

Spot Checks

At frequent intervals you should visually check the Baseline 10/100 Switch. Regular checks can give you an early warning of a possible failure; any problems can then be attended to when there will be least effect on users. Check that all external cabling connections are secure and that no cables are pulled taut.

If you experience any problems operating the Baseline 10/100 Switch, refer to “Problem Solving” on page 5.

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