3Com 3C16592B, 3C16593B manual How To Use The Baseline Dual Speed Hub, Front Panel, MDI Switch

HOW TO USE THE BASELINE DUAL SPEED HUB

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								Status								Segment			Baseline Dual Speed Hub
12x				yellow = 10Mbps link OK								off = no link					off = no traffic
		MDI			green = 100Mbps, link OK						flashing = partition					green = partition
																yellow = collisions
		MDIX	1		2	3	4	5	6	7	8	9	10	11 12		100Mbps
24			13		14	15	16	17	18	19	20	21 22		23	24	10Mbps		Power	3C16593B SuperStack® 3

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Numbered elements in this diagram refer to numbered sections in the text. These numbers, in bold, are used as references.

series, ensure that there are no more than four 10 Mbps hubs between any two devices on your network, as shown below.

Front Panel

1 12 or 24 RJ-45 10/100 Ports

You can use these ports to connect 10BASE-T or 100BASE-TX devices (workstations and other equipment) to the Baseline Dual Speed Hub. As the ports are autosensing, the speed of the ports is determined automatically when you connect your equipment.

WARNING: RJ-45 Ports. These are shielded RJ-45 data 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 tele- phony 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: Points d’accès 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 con- nection de l’unité à un réseau téléphonique central privé ou pub- lic. 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- nées.

WARNHINWEIS: RJ-45-Porte. Diese Porte sind geschützte Dat- ensteckdosen. Sie dürfen weder wie normale traditionelle Tele- fonsteckdosen 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.

Connect one end of the TP (twisted pair) cable to the RJ-45 port on the Baseline Dual Speed Hub and the other end to the appropriate RJ-45 port on the device. Use either shielded or unshielded data cables (with shielded or unshielded jacks) to connect to the devices.

The equipment that is connected to the Baseline Dual Speed Hub must not be set to operate in full duplex mode. It must be set to operate in autonegotiate or half duplex mode.

10BASE-T

To connect 10BASE-T equipment, use 10BASE-T Category 3 or Category 5 unshielded or shielded (screened) 100 Ohm TP cable.

Category 5 cable should be used with this product in structured wiring environments. This will ensure correct operation of all ports at 10 Mbps or 100 Mbps.

Ethernet Network Configuration Rules

To remain within IEEE 802.3 10 Mbps Ethernet rules, the maximum length of cable between the Baseline Dual Speed Hub and an attached device must not exceed 100 m (328 ft). If you are connecting multiple hubs in

100BASE-TX

To connect 100BASE-TX equipment, use 100BASE-TX Category 5 unshielded or shielded (screened) 100 Ohm TP cable.

Fast Ethernet Network Configuration Rules

To remain within IEEE 802.3 100 Mbps Fast Ethernet rules, the maximum length of cable between the Baseline Dual Speed Hub and an attached device must not exceed 100 m (328 ft). Ensure that there are no more than two 100 Mbps hubs between any two devices on your network, and that the total cable distance (A+B+C) between the two devices does not exceed 205 m (672.4 ft), as shown below.

If you connect two Baseline Dual Speed Hubs together, the link between them operates at 100 Mbps.

2 MDI Switch

This switch affects port 12 (3C16592B) or port 24 (3C16593B). Ports 1–11 (3C16592B) or 1–23 (3C16593B) are fixed as MDIX ports. Each can be connected to a device with an MDI port (such as most workstations) using a normal “straight through” TP cable. Port 12 or 24 is “switch selectable” using the MDI switch:

Out	In this position, port 12 or 24 is an MDIX port. It can be
	connected to a device with an MDI port (such as most
MDIX	workstations) using a normal “straight through” TP cable.
In	In this position, port 12 or 24 is an MDI port.
MDI	It can be connected to an MDIX port on a device (such as
	another hub) using a normal “straight through” TP cable.
	Set switch to
Unit 1	MDI (in)

Unit 2

Switch set to MDIX (out)

if port 24 used

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