of structured Cabling
Over time, developers of wiring
systems and standards recognised the need for computer communications
in addition to the telephone systems, the original driving
force. The EIA/TIA 568 series of standards and ISO 11801
are generally recognised as the controlling documents for
building structured wiring systems. We have come full circle.
A structured wiring system offers something
never possible when Ethernet was first developed:
a stable wiring infrastructure capable of supporting high-speed
LAN communication, with:
- Controlled electrical characteristics
of the cables and wiring system.
- A star-wired topology, with dedicated
media for each device.
- Every cable terminating in a wiring
closet, in which LAN hub and cable interconnection equipment
can be placed. Telephone systems have used star wired
topologies for more than one hundred years, with good
reason. while formal specifications for structured wiring
that is compatible with both high-speed LANís and digital
telephone systems have emerged only recently, the advantages
of a star-wiring topology are clear. - Ease of executing
moves, adds, and changes to the configuration. This is
unquestionably the primary advantage of a structured wiring
system. In most organisations,there is a constant need
to add users, shift users from one location to another.
With a bus or daisy-chain topology (as used in coaxial
Ethernet systems), any change to the configuration would
require rewiring (including climbing into ceiling voids
or removing permanent walls to access the cables) and
network disruption (while devices are added). With a structured
wiring system, every work location is prewired, thus eliminating
the need for new wiring when users are added. More importantly,
the configuration of the network is done at a patch panel
in the wiring closet and does not require access either
the userís end of the connection or the horizontal cable
itself. In this manner, reconfiguration, even asextensive
as a wholesale move of an entire work group, can be executed
quickly, in one location, without disrupting other users
of the network.
1) ATM - B6 & 100 base T
2) 10 Base T - B8
3) Token Ring - B9
4) Unshielded Twisted pair,
UTP is a media of choice where the Environment does not
contain a high level of ambient noise such as factrory and
electro magnetic interface (EMI) sensitive environments
such as labs.
CAT 5 cable with 4 individually twisted pairs is recommended
for horizontal section of SCS. This comprises of cable to
the wall plates or surface blocks near the work stations.
CAT 5 UTP has proven itself as the universal medium
that will carry all of our current communications applied
such as Voice, RS 232, Token Ring, 10 BaseT, 100 & 1000
Essentially Structured Cabling
System is a simple physical link between active components,
and is comprised of unshielded twisted pair (UTP) cable
or Optical Fiber Cable or is a combination of both the cables.
However to facilitate the day to day operations of a normal
office environment, the link must enable the user to make
Moves, Adds and Changes, whenever and wherever possible
without disturbing the network. This is possible with Structured
Cabling System. Further more Structured Cabling System is
also universal in its ability to carry a wide variety of
applications from voice and low speed data to image and
high speed LAN applications.
Horizontal cabling is
a cable run that extends from a wall outlet in an office
to a termination point in a wiring closet.
Backbone, or vertical,
cabling is the cabling that runs between the Main Distribution
Frame (MDF) and outlying Intermediate Distribution Frames
(IDFs). Most often this cable runs vertically between
floors of a multi-storeyed building, but it may also
run horizontally if the floor area is too large for
service by the MDF.
Components extend from
the telecommunications closet/connector end of the horizontal
cabling to the station equipment. Required adaptors
such as baluns, splitters, media filters, etc. Must
be external to the telecommunications outlet/connector.
Closet ( Tc)
is to be designed and provided as per the standards.
It is the primary function for horizontal distribution
and may connect intermediate or main cross connects.
This provides a controlled environment to house telecommunications
Equipment rooms Considered
distinct from TCs due to the nature or complexity of
equipment they contain. Equipment rooms can provide
any or all of the functions of the TC. This is to be
designed and provisioned as per ANSI/TIA/EIA-569. Provides
a controlled environment to house telecommunications
equipment, connecting hardware and splice enclosures,
grounding and bonding facilities and protection apparatus
where applicable. May contain either the main cross
connect or intermediate cross connect and horizontal
cross connect for portions of the building. Often contains
network trunk / auxiliary terminations.