Black Box FALLBACK RS-232 Manual do Utilizador descarregar pdf

Make your system

more reliable by

switching to a backup

modem when your

primary link fails.

Minimize downtime

and inconvenience.

Flexible—can perform

either manual or

automatic changeover

switching.

Front-panel LEDs

show you system

status at a glance.

Supports rates as high

as your RS-232 line

can carry.

230-volt version

available.

reakdowns in your data

communication are always

inconvenient—and often

expensive. Our RS-232 Fallback

Switch gives you another way to

get your vital data through with

the least amount of downtime.

By diverting the traffic from

a primary modem to a backup

modem when the preferred

communications pathway fails,

the RS-232 Fallback Switch keeps

your data flowing. And because

the switchover is fast, efficient,

and highly reliable, you’re given

that extra bit of assurance that

your essential information will

be there when it needs to be.

Ideal for switching your data

from a dedicated leased-line

modem to a dialup modem when

the leased line goes down, the

device switches all 12 leads that

are normally required for sync or

async operation. What’s more, it

can support data rates as high as

your RS-232 cable can carry.

PRIMARY ALTERNATIVE

RS-232 FALLBACK SWITCH

PRI

AUTO ALT

End transmission downtime with

automatic modem switching.

Key Features

RS-232 FALLBACK SWITCH

Automatic or manual modes

The RS-232 Fallback Switch

also gives you several switching

options, providing flexibility as

your system requirements

change. You can operate the

switch manually (physically

switching between modems as

needed), but it also has two

automatic modes of operation:

normal fallback (FB) mode and

autoswitching (AS) mode, which

you can customize by setting

jumpers inside the unit.

Preset to operate in FB mode,

the switch normally

communicates with the modem

attached to its PRIMARY

connector. But, during automatic

operation, the RS-232 Fallback

Switch also checks constantly for

the presence of a “trigger signal”

on its ALTERNATE connector. And

if one is sensed—whether it’s

DSR (Data Set Ready, Pin 6), CTS

(Clear To Send), or Carrier Detect

(CD), depending on which of

these you select—it’ll switch to

the modem attached to that

connector. (This switch occurs

even if the primary modem is still

operating.) When the switch no

longer senses the trigger signal,

it “falls back” to the primary

modem.

In contrast, if you set the

switch’s jumper to AS mode,

the RS-232 Fallback Switch

doesn’t give either the primary or

alternate channel higher priority

than the other; it switches to

whichever modem raises the

trigger signal first, and won’t

switch back to the other modem

until the currently connected one

drops the trigger signal.

Simple to set up and operate

Once the switch is configured,

simply install it in a cool, dry place

close to the devices you want to

attach to it and connect the

necessary cables. This simple

Black Box Corporation • 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Support: 724-746-5500 • www.blackbox.com • e-mail: [email protected]

Black Box Corporation.

12/18/2003 #11110

1 2

Resumo do Conteúdo

Página 1 - RS-232 FALLBACK SWITCH

1Make your systemmore reliable byswitching to a backupmodem when yourprimary link fails.Minimize downtimeand inconvenience.Flexible—can performeither

Página 2 - Typical Application

2Compliance: FCC Part 15, Class A;DOC Class/MDC classe A; CECompatibility: Compatible withdialup modems using ITU-TSSV.34, V.32 bis, V.32, and mostoth

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Black Box FALLBACK RS-232 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Conversores de séries/repetidores/isoladores Black Box FALLBACK RS-232. Black Box FALLBACK RS-232 User's Manual Manual do Utilizador

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