Black Box ServManager SW995A-R2, Руководство пользователя

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33
CHAPTER 4: Operation
4.1.3 M
ONITOR
NOTE
No keyboard/video switch can provide perfect video. You will see at least
a little fuzziness on your monitor no matter how close to ideal your
ServManager system is.
If all of your CPUs are of the same type, we recommend that you use the
corresponding type of monitor. If your CPUs are of different types, the
monitor
must
be a multisync model, able to sync to every CPU’s video-output
frequencies, and compatible with all of the CPUs’ video cards. Also, while PC-
type CPUs and VGA monitors normally use two separate leads to send/receive
sync signals, one lead for horizontal sync and one for vertical sync, Mac and
Sun CPUs/monitors normally send/receive a composite sync signal on a
single lead. This means that either your monitor
must be capable of accepting
both H/V and composite-sync input, or you will have to use a sync converter
and special cables to convert H/V to composite sync or vice versa (call Black
Box Technical Support for a special quote).
For maximum compatibility, we recommend a 17" or larger, high-quality
multisync monitor capable of (a) displaying a maximum resolution of not less
than 1280 x 1024 at a maximum refresh rate of not less than 75 Hz, and (b)
accepting both relevant types of sync input (H/V and composite). The NEC
Multisync 5SG is one such monitor, and others are available from NEC, Sony
® ,
CTX ® , etc. (However, since these monitors usually have a DE15 [also called
“DB15HD” or “HD15”] video-input connector, you will need a special
M/K/M Adapter Cable to use them with Mac or Sun keyboards and mice—
call Black Box Technical Support for a special quote.) The higher the
resolution you use, the less distance you can run; see
Tables 4-2 and 4-3 on the following pages.
Other concerns specific to IBM PC systems:
• The ServManager is designed to support standard VGA video, including
VGA monochrome (“page white”). It does not support PCs that use
proprietary versions of VGA that depart from the original specifications.
Consult your PC’s manual, and if that doesn’t tell you whether or not the
PC uses standard VGA, consult with the PC’s or the video card’s
manufacturer.
• The ServManager is also designed to support SVGA, although it doesn’t
handle higher resolutions or longer distances very well without coaxial
cabling (see the next two pages). With coaxial cables, it will also support
XGA.