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14th Reading > Chp 4 Backbone Distribution Systems > Flashcards

Chp 4 Backbone Distribution Systems Flashcards

1
Q

MC is

A

Main Cross Connect. Campus Distribution

The cross-connect normally located in the (main) equipment room for
cross-connection and interconnection of entrance cables, first level
backbone cables, and equipment cables. Campus distributor is the
international equivalent term for main cross-connect

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2
Q

HC is

A

Horizontal cross connect. Floor distribution (for floor)

A group of connectors (e.g., patch panel, punch-down block) that
allow equipment and backbone cabling to be cross-connected or
interconnected with patch cords or jumpers to horizontal cabling.
Floor distributor is the international equivalent term for horizontal
cross-connect.

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3
Q

TR

A

Telecom room. TE is located here and is where HC is located

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4
Q

Backbone distribution components

A

Cabling pathways
ERs with (HCs, ICs, and/or MCs)
TRs with HCs
TEs with HCs
An EF
Transmission media
Misc. support facilities

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5
Q

IC is

A

Intermediate Cross connect. Building distribution.

The connection point between a backbone cable that extends from
the MC (CD [first level backbone]) and the backbone cable from the
HC (FD [second level backbone]). Building distributor is the
international equivalent term for intermediate cross-connect.

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6
Q

Conduit pathways

A

Shafts, conduits, raceways, tray, floor penetrations (e.g., sleeves or
slots), maintenance holes, hand holes, conduit banks (and other
outside plant pathways) that provide routing space for cables.

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7
Q

Equipment room

A

An environmentally controlled centralized space for
telecommunications equipment that usually houses a main or
intermediate cross-connect. (TIA)

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8
Q

Telecommunications room

A

An enclosed architectural space for housing telecommunications
equipment, cable terminations, and cross-connect cabling. (TIA)

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9
Q

TE

A

A case or housing that may contain telecommunications equipment,
cable terminations, or horizontal cross-connect cabling. (TIA)

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10
Q

Entrance Facility

A

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

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11
Q

Backbone distribution system provides:

A

A backbone distribution system typically provides:
* Building connections between floors in multi-story buildings.
* Campus connections in multi-building environments.

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12
Q

Backbone distribution system is

A

the part of the property distribution system that connects various telecom spaces

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13
Q

Transmission media

A

The actual medium carrying the backbone signal:
Fiber Optics
Balanced Pair Cabling
Coax
Wireless

And termination hardware/connectors:
Cross Connects
Patch Panels
Patch Cords
Interconnections
Connector blocks

Note: backbone media may also be made of wireless connections

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14
Q

Miscellaneous Support

A

Materials needed for the proper termination and facilities installation
of the backbone cables.
These include:
* Cable support hardware.
* Firestop (see Chapter 7: Firestop Systems).
* Bonding hardware (see Chapter 8: Bonding and Grounding
[Earthing]).
* Protection and security.

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15
Q

Fundamental Cabling Topologies

A

Star
Bus
Ring

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16
Q

Hybrid Topologies

A

Hierarchial Star
Star-wired ring
Clustered Star
Tree and branch
Mesh

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17
Q

Redundancy Types

A

Active redundancy equipment utilizing redundancy pairs

Physical diverse cable routing

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18
Q

network equipment Redundancy uses

A

Redundancy pairs

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19
Q

Disconnect events:

A

cable breakage
significant loss on primary and redundant pairs
Patch cable/block removal
Disconnection of adaptors on cabling system side

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20
Q

Redunant pairs doesnt protect against

A

disconnect events

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20
Q

Redunant pairs doesnt protect against

A

disconnect events

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21
Q

Ring Topology general requirement

A

RECCOMMENDED a direct connection to the MC

22
Q

Ring topology may be used when

A

-Existing pathways support it.
-Primary system purpose is fiber optic distributed data interface, SONET, or reverse ethernet
-There is a redunant path

23
Q

Physical ring/logical star + Physical Ring network topology requires

A

knowledge of present and future telecom requirements to design this type.
see figure 4.5

24
Q

Physical star/logical ring

A

Pathways are star topology, but the signaling will be routed in a logical ring

25
Q

Physical star/logical ring applications

A

-a segment of the cabling will utilize existing cable
-the designer determines it is not possible to form a physical ring

26
Q

Clustered star

A

Either physical star/logical ring or star topology from MC to nodes, and nodes with star topolgy.
Allows for fault tolerant routing at nodes

27
Q

Bus topology

A

Linear connection. Only ideal if pathway is secure, traffic is not critical, and redundancy not required

28
Q

Factors in Fiber Optic/Telephony/Data topology selected

A

Budget
Survivability plans
Redundancy requirements
Network traffic importance (critical or not)
Pathway infrastructure
Equipment functionality
Existing components to be reused

29
Q

Tree and branch application

A

CATV, balanced pair, and Fiber Optic

Used to describe the MC node having cabling systems extending from them with multiple branches, along which splice points enable a single branch to serve multiple sub-nodes

30
Q

CATV feeder/trunk cable

A

Coaxial cable from head end to branch

31
Q

Factors in CATV topology selected

A

Signal loss characteristics of coax cable
Geographical area being served

32
Q

Telephony/Data network
feeder/trunk

A

the MC cable

33
Q

Fully Connected Mesh

A

all nodes connected directly to all other nodes w/ PTP link

34
Q

Mesh benefit

A

high redundancy

35
Q

Mesh setback

A

high cost

36
Q

Mesh applications

A

Enterprise networks and Service providers routers

37
Q

Partial Connected

A

some nodes are connected to more than 1 node with a PTP link.

Advantage: use redundancy similar to full connected with the major expenses

38
Q

Partial Connected Mesh networks require equipment to have some sort of __________ to determine the routing path to use

A

logical routing protocol

39
Q

PON

A

fiber - point to multi-point

used to be more cost effect than PTP by having unpowered splitters allowing a single fiber to server 32-128 premesis

can be FTTH, FTTB, FTTC

40
Q

FTTC

A

fiber to the curb

41
Q

FTTB

A

fiber to the building

42
Q

FTTH

A

fiber to the home

43
Q

1000BASE-X extended temperature range

A

-4.4 C to 85 C
-40F to 185F

44
Q

Cost factors of fiber deployment

A

Singlemode/multimode
strand count

45
Q

ONT

A

optical network termination

46
Q

OLT

A

Optical line termination

47
Q

Single mode fiber ITU-T reccommendation

A

Series G used for subscriber access in support of SDH and SONET

48
Q

Balanced Twisted Pair PTP rates/names/term

A

10Mb/s and 2Mb/s, 10PASS-T and 2PASS-t, EoDSL

49
Q

Balanced Twisted Pair PTP applications

A

MDU premesis, neighborhoods, and business parks

50
Q

Ethernet over PTP balanced twisted-pair cable is probably the best fit for established
neighborhoods, business parks, and MDUs because it can reuse the ______________.

A

First mile of existing voice-grade balanced twisted pair cable

51
Q

Hierarchical Star

A

The MC (CD) should be close to (if not located in) the main ER (e.g., data center or computer
room).
Ideally, the MC (CD) would:
* Be at the center of the buildings being served.
* Have adequate space for the cross-connect hardware and equipment.
* Have suitable pathways linking it to the other buildings.
NOTE: See the latest edition of BICSI’s OSPDRM for OSP pathway information.
Some of the advantages of using a first level hierarchical star for the campus backbone are
that it:
* Provides a single point of control for system administration.
* Allows testing and reconfiguration of the system’s topology and applications from the
MC (CD).
* Allows easy maintenance and security against unauthorized access.
* Provides increased flexibility.
* Allows the easy addition of future campus backbones

52
Q

Cross connects

A

Must not pass thru more than 3 between HCs.
Max of 2 levels from MC to HC

53
Q

Cross connects should be avoided between _________, although alternate redundant pathways can be designed like this.

A

HCs

14th Reading (13 decks)

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