Before You Begin; Surveying The Installation Site; Interference Limitation - Digi PortServer II User Manual

Before you Begin

Before you can install PortServer II, you must do the following:
• Select a location.
• Determine cabling requirements and obtain proper cables.
• Have available a terminal (or PC with terminal emulation software) to configure
PortServer II.

Surveying the Installation Site

1. Identify the best location to place PortServer II. You may want to review the Site
Environment requirements and the information given on Interference Limitation
below.
2. Locate the relevant connection points to the Ethernet and each PC, terminal,
modem, and printer to which you will connect PortServer II. Measure the distance
from the PortServer II location to each connection point.
3. Decide the length and type of cable required to make each connection. Remember
that each cable should be longer than the distance you measured to allow for tidy
routing.
4. Check that the cable lengths are within the maximum distance limitations for that
type of cable, using the information in Recommended Maximum Distance Limita-
tions below. If any of the maximum distances are exceeded, you may have to relo-
cate PortServer II.
5. If the cable lengths do not exceed the maximum specified distance, obtain the
required cables.

Interference limitation

Reliable operation of PortServer II can be compromised by electromagnetic interfer-
ence generated in the connecting cables. Typically, this interference may be derived
from three sources:
• Plant and equipment containing electric motors, such as air conditioners or heat-
ing pumps, or their connecting cables
• High power radio transmitters
• Lightning strikes
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