RCDD (RCDD): Case Studies and Concepts 5

Question 1

A case study describes an existing building where horizontal cable runs must pass through a 2-hour fire-rated wall. What is the correct approach per applicable codes?

Accepted Answer

Install all cables in a single conduit and apply a UL-listed firestop system around the conduit

Answer

All penetrations through fire-rated assemblies must be sealed with UL-listed firestop systems; plenum rating does not exempt cables from this requirement.

Question 2

An RCDD is designing a 400 m backbone fiber run between two campus buildings. Multimode fiber is proposed. Per ANSI/TIA-568.3-D, which multimode fiber type supports 10GBASE-SR at this distance?

Accepted Answer

OM4

Answer

OM4 multimode fiber supports 10GBASE-SR at up to 400 m, whereas OM3 is limited to 300 m at 10 Gbps.

Question 3

During a site survey for a new telecommunications room, the RCDD discovers the proposed space has a ceiling height of 2.1 m. Per ANSI/TIA-569-D, what action should be taken?

Accepted Answer

Request that the ceiling height be raised to the minimum 2.4 m

Answer

ANSI/TIA-569-D specifies a minimum ceiling height of 2.4 m (8 ft) for telecommunications rooms, so 2.1 m is non-compliant.

Question 4

A government building requires a telecommunications infrastructure that supports classified and unclassified networks. The RCDD must ensure physical separation between the two networks. What concept governs this requirement?

Accepted Answer

Physical separation (air gap) with separate dedicated cabling systems for each classification level

Answer

Classified government networks typically require a physical air gap with completely separate, dedicated cabling systems per NIST and DISA requirements.

Question 5

An RCDD is reviewing the administration and labeling plan for a 500-outlet installation. Per ANSI/TIA-606-C, which identifier is required on every horizontal link?

Accepted Answer

An identifier that includes the TR designation and a unique link number within that TR

Answer

TIA-606-C requires each horizontal link to have an identifier that includes the serving telecommunications room identifier and a unique link number within that space.

RCDD - Registered Communications Distribution Designer Practice Test

RCDD - Registered Communications Distribution Designer Practice Test

RCDD (RCDD): Case Studies and Concepts 5