3Com 3C510511B Manuale d'uso - Pagina 4

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Internetworking Port

The Internetworking Port is a shielded RJ45 port that allows

switch/bridge connection to the ring. This port may also be used as a

regular lobe port. This is a data communication port and cannot be

used for any other purpose. The Internetworking LED on the front panel

corresponds to this port and indicates the status of this port. See item 3.

Network Management Module Console Port

Each Network Management Module has a standard RS-232 serial port for

communicating with the module's setup console. Refer to the Network

Management Module manual for complete instructions.

Network Management Module Reset

The Network Management Module can be reset at any time by pressing

this button. When pressed, all data that has been collected by the

module will be lost (history ﬁles, alarm thresholds, captured packets etc.).

Resetting this module will NOT affect the operation of the network. Use

the tip of a nonconductive instrument to toggle the switch.

Network Management Module

There are two optional Network Management modules which provide

real-time monitoring and control of the entire stack via the Simple

Network Management Protocol (SNMP). The modules measure network

performance and monitor each individual device within the stack.

Using the Remote Monitoring Management Information Base (RMON

MIB) of SNMP, the modules collect statistics, provide historical data,

trafﬁc patterns, and collect remote packet captures. Automatic port

mapping provides a continuous real-time diagram of all hub-to-hub

interconnections, adapter card locations and adapter card addresses by

hub port.

Each module has an RS-232 DB9 serial port for local console connection

for conﬁguring IP addresses, routing tables, and communication

parameters. This port can also be used as a point-to-point link for

remote communications.

Default communication settings for the RS-232 port are:

9600 Baud, 8 data bits, 1 stop bit, No parity

Access to the Network Management module is provided in-band via the

Transcend Enterprise Manager application which operates on IBM

NetView/6000®, HP OpenView®, SunNet™ Manager, and Windows™

platforms.

The basic RMON Agent (#3C510502) provides History, Ring Security,

Control and Stack Views, MAC-to-MAC Port Mapping and MAC Packet

Capture. In addition, this module uses 1 MB of RAM for storage of

historical data and can be upgraded to 5MB. The Advanced RMON

Agent (#3C10505) provides all of the features of the basic RMON module

and also provides IP and IPX Mapping, Data Layer Capture/Filter Matrices,

Protocol Breakdown, and Station History on a per station basis. In

addition, this module uses 4MB of RAM for storage and can be upgraded

to either 8 or 12 MB. Refer to the SuperStack II Hub TR Network

Management Module manual for instructions on installing the modules

and details on the distinct features of each module.

Cascade Cable Connectors

You can add up to 20 units in a single stack using the Cascade cable

connectors. You need one Cascade cable (12 inch cable #3C510507

[included with each hub] or 4 foot cable #3C510509) for each additional

unit.

Place the units on top of each other, preferably in a rack (see Rack Mount

instructions). If you are not using a rack, ensure that the feet are

installed on the bottom of the units throughout the stack and that the

stack extends no more than eight units high.

Connect units in sequence starting from the Down port on the topmost

unit which connects to the Up connector on the next hub in the stack.

The Down connector of the next unit connects to the Up connector on

the next one and so on (Down-Up-Down-Up) until all units are

connected. The bottommost unit should be connected to the hub

above it via the Up connector and the Down connector should remain

vacant unless using a Redundant Cascade cable (#3C510508).

An optional Redundant Cascade cable provides a redundant path for the

Cascade and connects the bottommost unit directly to the topmost unit.

Note that this cable is not interchangeable with a regular Cascade

cable. The Cascade LEDs on the front panel indicate the status of the

Cascade connection.

SuperStack II Hub TR hubs can be stacked in any combination with

earlier LinkBuilder FMS TR hubs (#3C510500 and #3C510501). Refer to

ﬁgure below for proper cascade cable installation

Ring In/Ring Out Module

The Ring In/Ring Out (RI/RO) Module allows you to expand your Token

Ring beyond the capacity of the local stack to adjacent wiring closets or

any site that is too far away for the cascade cables. This module is

available with either two RJ45 shielded copper connectors (#3C510504),

two pair ST ﬁber optic connectors (#3C510503), or a combination

module with one copper and one pair ST ﬁber optic connectors

(#3C510506).

In addition two other optional Ring In/Ring Out (RI/RO) Modules

(#3C510513 and 3C510514) allow you to connect to any ONcore,

ONLine, or ONsemble Token Ring device.

All the sophisticated network management functions provided using the

Transcend application and the Network Management module are

available via the Ring In/Ring Out connections provided there is a

Network Management Module in the adjoining stack.

Refer to the Ring In/Ring Out Module manual for instructions on

installing the module into the Hub TR unit. If you should remove the

Ring In/Ring Out Module from the Hub TR, you need to replace the ﬁller

plate to avoid accidental exposure to the electronic circuitry and to

prevent the accumulation of dust and debris.

Roving RMON

A single Network Management module (either #3C510502 or

#3C510505) can be used to manage a number of Hub TR hubs that are

stacked together and connected via Cascade cables, but isolated into

separate Token Ring networks. This allows the agent to "rove" into any

connecting hub and perform management tasks.

This feature is especially useful in stacks segmented using Token Ring

switches.

To enable the Roving RMON feature, connect the cascade cables and

isolate the cascade interfaces via software using the RS-232 console of

the Network Management module and/or the Transcend Network

Management applications, or telnet. Refer to the Network Management

Module or Transcend Enterprise Manager manuals for more information.