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RCDD · Question #151

Assume the following: - An equipment room (ER) consists of 16 racks arranged in 4 equal rows - The first 4 racks are numbered R1-1 though R1-4 - The second 4 racks are numbered R2-1 through R2-4 - A…

The correct answer is A. R2-3-1-8-1 and R2-3-1-8-2. ANSI/TIA-606 defines a hierarchical identifier format of row-rack-shelf-slot-port, so the eighth slot of the first shelf in rack R2-3 yields ports R2-3-1-8-1 and R2-3-1-8-2.

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Question

Assume the following:

  • An equipment room (ER) consists of 16 racks arranged in 4 equal rows
  • The first 4 racks are numbered R1-1 though R1-4
  • The second 4 racks are numbered R2-1 through R2-4
  • A new equipment shelf with 12 slots is to be installed in the bottom

of the third rack in the second row

  • Each slot has 2 ports

What would be the identifier of the two ports on the eighth slot of the new equipment shelf?

Options

  • AR2-3-1-8-1 and R2-3-1-8-2
  • BR3-2-1-8-1 and R3-2-1-8-2
  • CR2-3-1-12-1 and R2-3-1-12-2
  • DR3-2-1-12-1 and R3-2-1-12-2
  • ER2-3-12-8-1 and R2-3-12-8-2

How the community answered

(44 responses)
  • A
    77% (34)
  • B
    2% (1)
  • C
    2% (1)
  • D
    7% (3)
  • E
    11% (5)

Why each option

ANSI/TIA-606 defines a hierarchical identifier format of row-rack-shelf-slot-port, so the eighth slot of the first shelf in rack R2-3 yields ports R2-3-1-8-1 and R2-3-1-8-2.

AR2-3-1-8-1 and R2-3-1-8-2Correct

Following the TIA-606 hierarchical format, the third rack in the second row is R2-3, the new shelf installed is the first shelf on that rack (1), the eighth slot is 8, and the two ports are 1 and 2 - producing identifiers R2-3-1-8-1 and R2-3-1-8-2. Each segment of the identifier represents a level in the physical hierarchy.

BR3-2-1-8-1 and R3-2-1-8-2

R3-2 transposes the row and rack values, incorrectly placing the equipment in row 3, rack 2 instead of the correct row 2, rack 3.

CR2-3-1-12-1 and R2-3-1-12-2

These identifiers use 12 - the total number of slots on the shelf - in the slot position instead of the actual slot number 8, referencing a nonexistent or wrong slot.

DR3-2-1-12-1 and R3-2-1-12-2

These identifiers contain two compounded errors: the row and rack numbers are transposed (R3-2 instead of R2-3), and slot 12 is used instead of slot 8.

ER2-3-12-8-1 and R2-3-12-8-2

These identifiers incorrectly place the total slot count (12) in the shelf position of the hierarchy, substituting it for the shelf number (1) and producing a malformed identifier.

Concept tested: TIA-606 hierarchical identifier format for equipment ports

Source: https://www.tiaonline.org/standard/tia-606-c/

Topics

#equipment room#rack identification#port numbering#TIA-606

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