22
SERVSWITCH™ PROFESSOR
Take these steps:
1. After you verify that the Professor is turned off and unplugged, plug the DB25
male connector of the CPU’s CPU Cable into the DB25 female COMPUTER
port on the Professor’s front panel.
2. Plug the CPU Cable’s video-, keyboard-, and mouse-port connectors into the
corresponding ports on the CPU. The CPU should be OFF when you do this;
the Switch will automatically adjust to the CPU’s keyboard mode when you
power up the CPU. Avoid plugging CPUs into the ServSwitch if they are
already ON; if you accidentally do so, see
Section 4.3.19
to make sure the
Professor is set for the proper keyboard mode.
CAUTION!
Do
not
attach docking stations for older models of the ThinkPad
®
or
other portable computers to the ServSwitch Professor. The Professor
currently supports only “stream mode” (continuous) mouse data, but
older ThinkPad models have to see “prompt mode” (burst-on-request)
mouse data. Some newer docking stations and some newer ThinkPad
models might work with the Professor, but determining whether a
particular unit will do so will probably require trial and error.
3.3.5 C
ONNECTING THE
B
US
To interconnect ServSwitch Professors, you’ll use high-quality coaxial bus cables
with robust 13W3 male connectors. One such cable, 5 ft. (1.5 m) long, is included
with each Student Module Kit; if you ever need a replacement cable, or a longer
one, our product code is EHN275—specify your desired length. Also see
Appendix B
.
You’ll also need two terminators, one for each of the unoccupied BUS ports that
mark the start and end of the bus. These terminators are included with your System
Control Module Kit; if you ever need a replacement, the product code is SW991.
How you hook up the bus to a given station depends on where along the bus the
station is:
• To connect the bus to the
first
station—most often the instructor’s System
Control Module, although that doesn’t have to be the case—attach a bus cable
to the first station’s BUS OUT port and run it to the second station’s BUS IN
port, then attach a bus terminator to the first station’s BUS IN port.
• To connect the bus to one of the
middle
stations, take the bus cable running
from the previous station’s BUS OUT port and attach it to this station’s BUS
IN port. Then run a cable from
this
station’s BUS OUT port to the
next
station’s BUS IN port.
