3Com 3C16671 - SuperStack II Hub 10 Podręcznik użytkownika - Strona 3

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1. User Guide

NTRODUCTION

The SuperStack™ II Hub 10 24 Port TP (3C16671A) has 24 dedicated

twisted pair ports on the front panel and an AUI port on the rear panel.

The rear panel also has a slot for a 3Com Transceiver Module or Bridge

MicroModule; if fitted the Module will operate in addition to the AUI

port. A range of different media Transceiver Modules is available from

3Com (see

" Products and Bulletin Boards "

The Hub 10 24 Port TP can be stand-alone or linked with other Hub 10,

LinkBuilder FMS II, FMS, 10BT or 10BTi units to form a stack of units of

different media. Each stack is the equivalent to a single IEEE 802.3

repeater, so stacking units gives you the benefit of a higher port count.

The Hub 10 24 Port TP is suited for office use where it can be

wall-mounted, rack-mounted, or free standing. Alternatively, the unit can

be rack-mounted in a wiring closet or equipment room. A mounting kit

is supplied.

The Hub 10 24 Port TP can be powered either from the AC mains supply,

or through an optional 3Com Redundant Power System (3C565047) to

provide a more reliable supply. Contact your supplier for details.

Repeater Functions

The Hub 10 24 Port TP has been designed to conform to the IEEE 802.3

standard for Local Area Networks, and provides all the standard

functions of an 802.3 repeater, including:

Signal retiming

Preamble regeneration

Fragment extension

Automatic partition/reconnection

Management

A SuperStack II Hub 10 Management Module (3C16630A) or Advanced

RMON Module (3C16632) can be fitted to the Hub 10 24 Port TP to

provide f ull SNMP management , including statistics, resilient links and

security features . Only one Management Module or Advanced RMON

Module is required for each stack. Refer to the guides accompanying the

module for details on how to manage an Hub 10 unit or stack.

Resilience and Security

H ub 10 Management Module (3C16630A) and Hub 10 Advanced RMON

Module (3C16632) offer resilience and security f eatures.

U p to 16 resilient link pairs can be configured via management software.

To avoid the creation of loops during power-up, Hub 10 units provide a

Disable On Boot switch. If this switch is set to disable, all TP ports on the

unit will be disabled during power-up until they are correctly configured

and enabled by management software. This is only necessary on units

OW TO

Numbered elements in this diagram refer to numbered sections in the text.

These numbers, in bold, are used as references.

SE THE

which have ports assigned as standby. Standby ports in resilient link

pairs can only be configured on SuperStack II Hub 10 or LinkBuilder

FMS II units.

Security features are described in the manual which comes with your

Hub 10 Management Module.

B y disabling ports on boot up and enabling them with management

software, you provide extra security for the unit.

During the power up sequence, the main ports (on the front

panel) are disabled BUT the AUI port and Transceiver Module

port will be enabled for periods of up to 1 second. During this

brief moment, the AUI and Transceiver Module ports are NOT

secure.

Network Connections

You can connect the Hub 10 24 Port TP to any Data Terminal Equipment

(DTE) fitted with a 10Base-T network adapter or a 10Base-T transceiver.

Connect one end of the twisted pair cable to the RJ45 port on the unit

and the other end to the RJ45 port on your network adapter or

transceiver. You can attach up to 24 twisted pair segments to the front

of the unit.

The Hub 10 24 Port TP can use both shielded 150ohm, and unshielded

or shielded 100ohm twisted pair cables. To remain within 802.3 10Base-T

rules the maximum length of cable between the unit and any DTE

should not be greater than 100m (110 yards). Consult your supplier's

technical support department if you need to use twisted pair cables

over greater distances.

You can connect any 802.3 transceiver to the unit using an AUI cable

connected to the AUI port on the rear panel. Also, you can fit one of the

3Com Transceiver Modules or a Bridge MicroModule into the slot on the

rear panel (see

" Products and Bulletin Boards "

You can connect the Hub 10 24 Port TP to any other 10Base-T repeater

using port 24, to form an inter-repeater link. You must switch port 24 to

MDI to bypass the internal cross-over normally implemented by

10Base-T unit ports: see

Important

To manage this hub, you may n eed a new v ersion of the agent

software installed on y our Management Module. See

Management "

for details.

" MDI Switch "

" Stack