DCI Testing and Certification 5

Question 1

A Category 6 permanent link fails the NEXT test at high frequencies. Which corrective action is MOST likely to resolve this?

Accepted Answer

Re-terminate the connectors to reduce untwisting at the termination point

Answer

Excessive untwisting at connector terminations is the most common cause of NEXT failures; reducing untwisted length to the minimum required per manufacturer spec typically resolves the issue.

Question 2

What is the purpose of 'reference cords' when performing an OLTS fiber test using the one-cord reference method?

Accepted Answer

To establish a baseline loss measurement that zeroes out the test cord losses

Answer

Reference cords are used to zero the power meter so that only the losses of the link under test (connectors and cable) are measured, not the losses of the test equipment cords.

Question 3

Which BICSI credential is specifically designed for professionals who install and test structured cabling systems?

Accepted Answer

TECH (Technician)

Answer

The BICSI TECH credential is targeted at technicians who install and maintain telecommunications distribution systems, including cabling installation and testing.

Question 4

An OTDR dead zone prevents detection of events close to the launch end. What is the standard method to work around this limitation?

Accepted Answer

Use a launch cable (mandrel or launch lead) to move the dead zone away from the link under test

Answer

A launch cable (also called a mandrel or launch lead) of known length is connected before the link under test, pushing the dead zone onto the launch cable rather than the link being certified.

Question 5

What is the maximum allowable DC loop resistance for a 24 AWG Category 6 horizontal cable run of 90 meters?

Accepted Answer

9.38 Ω

Answer

Per TIA-568, the maximum DC resistance for 24 AWG solid copper conductors at 90 meters (permanent link) is approximately 9.38 Ω, which is verified during certification testing.

(DCI) Data Cabling Installer Practice Test

(DCI) Data Cabling Installer Practice Test

DCI Testing and Certification 5