Bay Networks BayRS Manual de usuario descargar pdf (Pagina 3)

In addition, 8, 16, or 32 megabytes

(MB) of DRAM can be installed and

configured to support customized

partitioning between local and global

memory. Router software resides in

local memory while global memory is

dedicated to packet buffers. Through

these reserved buffers, the ARN pre-

vents traffic overflow and resulting net-

work delays caused by large bursts of

traffic, such as file transfer operations.

Base module LAN interfaces

The ARN can be configured to

support 10Base-T Ethernet, autosense

10/100Base-TX (Fast Ethernet),

100Base-FX (Fast Ethernet), and

Token Ring to meet a wide variety

of connectivity requirements.

10Base-T Ethernet/802.3

The 10Base-T Ethernet/802.3 inter-

face supports IEEE 802.3 and Version

1.0/2.0 Ethernet formats. Both an

AUI (DB-15) and RJ-45 connector are

provided for a choice of connectivity.

10/100Base-TX

The ARN 100Base-T interfaces

support the copper and fiber optic

100Base-T cabling standards—

100Base-TX and 100Base-FX—for

flexible connectivity. The 10/100Base-

TX autosensing interface automatically

senses the line speed (either 10 Mbps

or 100 Mbps), providing a high-speed

LAN connection to branch offices as

they migrate to Fast Ethernet technolo-

gies. An RJ-45 connector is provided

for cable connection. The 100Base-FX

interface provides an ST connector to

allow the use of fiber optic (100Base-

FX) cable.

Token Ring

The Token Ring interface can operate

at either 4 or 16 Mbps ring speeds

(software configurable), providing the

flexibility to migrate to higher speeds

as performance requirements dictate.

A 9-pin D subminiature (DB-9)

connector for Shielded Twisted Pair

(STP) and an RJ-45 connector for

Unshielded Twisted Pair (UTP)

are provided for Token Ring cable

attachment.

Base module expansion options

Personal Computer Memory

Card International Association

(PCMCIA) Flash Memory Card

The 8 or 16 MB of externally accessi-

ble PCMCIA Flash memory of the

ARN allows for nonvolatile storage of

router software and configuration files.

Software image and configuration files

can be downloaded remotely to the

flash memory card, simplifying router

upgrades and fault recovery proce-

dures. To facilitate remote configura-

tion and management, the PCMCIA

flash memory card can even be pro-

grammed at the network center, mailed

to a remote site, and easily installed by

untrained personnel.

To provide redundancy, the PCMCIA

flash memory card can be logically

divided into two partitions of equal

size. Each partition is a uniquely

addressable and fully functional flash

file system volume where copies of

boot images and configuration files

can be stored.

V.34 Console Modem Module

In addition to the standard console

and external modem interfaces of the

ARN, a V.34 console modem option

can be installed to simplify remote

router deployment. The module also

supports out-of-band troubleshooting

should remote network access become

unavailable.

Redundant Power Supply Unit

For mission-critical deployments, an

optional Nortel Networks Redundant

Power Supply Unit (RPSU) can be

connected to the ARN router, provid-

ing a secondary power source in case

its primary power supply fails.

Ethernet RMON Probe

An optional DCM can be attached

directly to the Ethernet base module

of the ARN, providing comprehensive

monitoring capability to the router.

The probe contains a 25 MHz

Motorola MC68040 microprocessor.

It supports all nine groups of the

Ethernet RMON MIB (RFC 1757),

including Layer 3 traffic monitoring.

Through continuous monitoring of the

ARN router’s Ethernet LAN segment,

the DCM collects, correlates, and sum-

marizes long-term network activity

data. The resulting historical informa-

tion can then be used to detect trends

in network performance, faults, and

traffic flows, as well as to determine

the optimum configuration to

maximize network performance.

LED matrix display

A comprehensive matrix of LEDs

presents clear, at-a-glance status read-

outs of key ARN system components.

This includes the base module, WAN

adapters, expansion and data collection

modules, PCMCIA memory, RPSU

status, fans, and router software loading.

Along with providing quick insights

into the router’s status, the LED matrix

can also be used to supply networking

administrators with a remote view

of the router’s status via SNMP.

Integral WAN connectivity

The ARN router’s slide-in

WAN adapter modules offer the

functionality of WAN transmission

devices, supplying an integrated

solution that is easily managed as

a single platform. The WAN flexible

interfaces of the ARN enable users

to choose among today’s alternative

wide area networking links, including

Point-to-Point Protocol (PPP)

(synchronous or asynchronous),

Frame Relay, X.25, ISDN,

Switched Multi-megabit Data

Service (SMDS), or Asynchronous

Transfer Mode (ATM).

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