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DSP-100/2000
Users Manual
2-24
Selecting a Test Standard and Cable Type
The test standard and cable type you select determine which standards are used
and which tests are run during cable testing. The test tool is equipped with
information for all the common test standards and cable types.
Several of the test standards for twisted pair cable are defined for both a channel
and a basic link configuration. The test limits for a channel are looser than those
for a basic link because the channel limits allow for the effects of two connections
at a horizontal cross-connect and a transition connector near the
telecommunications outlet in the work area. Figure 2-2 shows the connections
involved in a channel; Figure 3-1 shows the connections involved in a basic link.
To select a test standard and cable type, proceed as follows:
1. Turn the rotary switch to SETUP.
2. Press ! Choice.
3. Use D U to highlight the test standard you want.
4. Press E to accept the highlighted test standard. The test tool displays a
menu of the cable types that are valid for the selected test standard.
5. Use D U to select the cable type you want; then press E.
If you select a shielded cable type, you can enable or disable the shield continuity
test on page 6 of the SETUP screens.
You can test cables for NEXT, attenuation, and ACR up to 100 MHz or 155 MHz.
Because no industry standards specify cable performance beyond 100 MHz, there
are no test limits for these measurements.
The maximum frequency selection is on page 6 of the SETUP screens.
Selecting an Average Cable Temperature
Some test standards require you to select an average temperature for the cable you
are testing. The selected temperature appears on the display when you turn the
rotary switch to AUTOTEST. If the test standard has no temperature-dependent
limits, N/A is displayed.
If you select a test standard that has temperature-dependent limits, the test tool
uses a default value of below 21°C (69°F) for the average cable temperature.