RCDD/TDMM Chapter 4) Backbone
Distribution Systems 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
Backbone Distribution System - 🧠 ANSWER ✔✔The part of the premises
distribution system that provides connection between telecom spaces.
CO - 🧠 ANSWER ✔✔Central Office. A common carrier switching center
office (also called public exchange) that is conveniently located in areas to
serve subscriber homes and businesses. It provides telephone services
(lines0 that are connected on a local loop. The CO contains switching
equipment that can switch calls locally or to long-distance carrier telephone
offices.
EF - 🧠 ANSWER ✔✔Entrance Facility; an entrance to a building for both
public and private network service cables (including wireless) including the
entrance point of the building and continuing to the entrance room or
space. (TIA)
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
,EFM - 🧠 ANSWER ✔✔Ethernet in the First mile; Term used to describe the
access network from the access point to the subscribers premises. Also
referred to as Ethernet in the Last Mile.
ER - 🧠 ANSWER ✔✔Equipment Room; An environmentally controlled
centralized space for telecom equipment that usually houses a main or
immediate cross connect (TIA)
HC (FD) - 🧠 ANSWER ✔✔Horizontal Cross Connect (Floor Distribution); A
group of connectors that allow equipment and backbone cabling to be
cross-connected or interconnected with patch cords or jumpers to
horizontal cabling
IC (BD) - 🧠 ANSWER ✔✔The connection point between a backbone cable
that extends from the MC (CD) [first level backbone] to the HC (FD)
[second level backbone].
MC (CD) - 🧠 ANSWER ✔✔Main Cross connect; campus distribution; The
cross connect normaly located in the main equipment room for cross
connection and interconnection of entrance cables, first level backbone
cables, and equipment cables.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
, RMC - 🧠 ANSWER ✔✔Rigid Metallic Conduit; A threaded metal raceway of
circular cross section with a coupling
TE - 🧠 ANSWER ✔✔Telecom Enclosure; a case or housing that may
contain telecommunications equipment, cable terminations, or horizontal
cross connect cabling. (TIA)
TR - 🧠 ANSWER ✔✔Telecom Room; an enclosed architectural space for
housing telecom equipment, cable terminations, and cross connect cabling.
(TIA)
Name the 2 function a backbone system provides in a campus. - 🧠
ANSWER ✔✔1) Building connections between floors in multi-story
buildings. 2) Campus connections in multi-building environments
Name 7 components of a backbone distribution system - 🧠 ANSWER ✔✔1)
Cable pathways. 2) ERs that may contain HCs (FDs), ICs (BDs), or MCs
(CDs). 3) TRs that typically contain HCs (FDs). 4) TEs that typically contain
HCs (FDs). 5) Entrance Facility (EF). 6) Transmission Media. 7) Misc
Support Facilities.
Which componenct of the backbone distribution system provides routing
space for cables? - 🧠 ANSWER ✔✔Cable Pathways
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
Distribution Systems 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
Backbone Distribution System - 🧠 ANSWER ✔✔The part of the premises
distribution system that provides connection between telecom spaces.
CO - 🧠 ANSWER ✔✔Central Office. A common carrier switching center
office (also called public exchange) that is conveniently located in areas to
serve subscriber homes and businesses. It provides telephone services
(lines0 that are connected on a local loop. The CO contains switching
equipment that can switch calls locally or to long-distance carrier telephone
offices.
EF - 🧠 ANSWER ✔✔Entrance Facility; an entrance to a building for both
public and private network service cables (including wireless) including the
entrance point of the building and continuing to the entrance room or
space. (TIA)
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
,EFM - 🧠 ANSWER ✔✔Ethernet in the First mile; Term used to describe the
access network from the access point to the subscribers premises. Also
referred to as Ethernet in the Last Mile.
ER - 🧠 ANSWER ✔✔Equipment Room; An environmentally controlled
centralized space for telecom equipment that usually houses a main or
immediate cross connect (TIA)
HC (FD) - 🧠 ANSWER ✔✔Horizontal Cross Connect (Floor Distribution); A
group of connectors that allow equipment and backbone cabling to be
cross-connected or interconnected with patch cords or jumpers to
horizontal cabling
IC (BD) - 🧠 ANSWER ✔✔The connection point between a backbone cable
that extends from the MC (CD) [first level backbone] to the HC (FD)
[second level backbone].
MC (CD) - 🧠 ANSWER ✔✔Main Cross connect; campus distribution; The
cross connect normaly located in the main equipment room for cross
connection and interconnection of entrance cables, first level backbone
cables, and equipment cables.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
, RMC - 🧠 ANSWER ✔✔Rigid Metallic Conduit; A threaded metal raceway of
circular cross section with a coupling
TE - 🧠 ANSWER ✔✔Telecom Enclosure; a case or housing that may
contain telecommunications equipment, cable terminations, or horizontal
cross connect cabling. (TIA)
TR - 🧠 ANSWER ✔✔Telecom Room; an enclosed architectural space for
housing telecom equipment, cable terminations, and cross connect cabling.
(TIA)
Name the 2 function a backbone system provides in a campus. - 🧠
ANSWER ✔✔1) Building connections between floors in multi-story
buildings. 2) Campus connections in multi-building environments
Name 7 components of a backbone distribution system - 🧠 ANSWER ✔✔1)
Cable pathways. 2) ERs that may contain HCs (FDs), ICs (BDs), or MCs
(CDs). 3) TRs that typically contain HCs (FDs). 4) TEs that typically contain
HCs (FDs). 5) Entrance Facility (EF). 6) Transmission Media. 7) Misc
Support Facilities.
Which componenct of the backbone distribution system provides routing
space for cables? - 🧠 ANSWER ✔✔Cable Pathways
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
