PBX & Voice Mail
Project Planning - Telecommunications
Facilities Guidelines -MDF - TR- IDF
To successfully design and
implement the types of systems that business will need in this millennium, companies
must possess skills analogous to those required to put together a very big, complicated,
jigsaw-puzzle. Each system will require that each system element fit or work in
harmony with the other pieces to the puzzle while integrating multiple IT-based
technologies. Figuring out how to build such systems is a daunting, complex task,
and the client must accomplish that task while trying to keep his/her day-to-day
business operation running smoothly. The key to a successful technology design is
to provide a platform to deliver the communications services. The heart of
this is the Network and Telecommunications and Cabling Infrastructure is the communications
rooms and cabling pathways throughout the facility. Our consultants have a
unique understanding of the and expertise in designing and implementing these core
Infrastructures. When you want your facilities design team to provide a uniform
platform to deliver communications services, let us work with your team on the design
and Implementation Management of these critical resources.
A. The main equipment
The main equipment room is where inside
and outside cables and conduit terminate. It is usually referred to as the MDF (Main
Distribution Frame). It is also the usual location for most of the electronic hardware
associated with the building's telecommunications facilities, including data equipment.
They could even house PBX switching equipment if necessary. Ancillary equipment
rooms are usually referred to as IDF's (Intermediate Distribution Frames). The changing
technology along with user's data requirements has caused a corresponding increase
in the electronics required in the equipment room, thus and increase in space, power
and HVAC requirements.
B. Design specifications
to consider for the MDF:
The MDF is generally located in the
basement or bottom floor of a building. IDF's located on the floors above are
generally "stacked" above the MDF to allow for ease of cable distribution and
limit cable distances. Cable distance is an important factor for data users. Most
data communications systems are limited to 300' maximum, to allow for 100Mbps
over 24 AWG twisted pair telephone cable. Because of these factors it is extremely
important to know the user's requirements for data as early in the design phase
MDF's should not be co-located with
electrical equipment due to the EMI-mechanical noise transmitted from the electrical
equipment. This noise interferes with most voice and data equipment, thus the
reason for segregation.
Room size: 8'W x 8'H x 8'L minimum
usable floor space. (The size may vary depending on the amount of communications
Usable backboard size: 8' x 8' x 3/4"
brightly painted, plywood backboard for cable termination's and electronic equipment,
with a minimum 4' clearance in front. It is mandatory that this room lock securely.
If a double door is used there should be no center posts or sills.
Two four-plex 110V AC electrical outlets
are required. When necessary the electrical outlets should be connected to UPS
or the buildings emergency generator power. These should be placed 6" from the
floor to center of the outlet box. No outlets should be switched.
Its is recommended that four 4" entrance
conduits terminate here. If necessary, Paradise Communications will provide Design
& Construction with an outside conduit design, identifying a route to the Point
of connection (LIM site). Pull rope must be installed in each of the 4" conduit.
A minimum of three 4" riser conduits/sleeves
with pull ropes between each IDF on every floor.
Static free flooring should be installed.
Lighting should be at 50 foot-candles
measured at 3' from the floor. The lighting fixtures should be hung at 8'6" from
the floor. No ceiling tiles should be installed in a telecommunications closet.
HVAC should be provided 365 days a
year. Expectable temperature range is 64-75 degrees, with a humidity range from
30 to 55% relative.
A grounding bus bar should be installed
in the MDF. This will part of the grounding backbone. All of the terminals that
feed from this MDF should have a common grounding system. Because of the electronic
equipment that is manufactured today a good grounding system is necessary.
C. Ancillary Equipment
IDFs (Intermediate Distribution Frames)
serve as local distribution points for the telecommunications cable which terminates
at the users workstation. Northern Telecom BIX equipment is use the terminal room
Usable backboard size: 4' x 8' x 3/4"
plywood backboard with 4' clearance in front. These rooms may be a closet-type
room if at least 3' of clearance is provided between the backboard and door when
closed. These IDFs must lock securely.
Two duplex 110V AC electrical outlets
connected to UPS or emergency power supply if available. These should be placed
6" from the floor to center of the outlet box. No outlets should be switched.
A minimum of two 4" riser conduits/sleeves
will extend to the IDF's located on the floors above.
Sleeve's, cable trays, floor distribution
conduit may terminate here to pick up cabling for horizontal distribution on each
Maximum distance from the furthest
jack to the terminal room on the floor should be 300'. Another terminal room may
be considered if the distance is exceeded.
CABLE TRAYS AND OTHER HORIZONTAL
Cable trays are installed in open areas
between the false ceiling and the floor above. They serve to accept the bulk and
weight of the telecommunications cabling routed through the ceiling. These trays
are accessed frequently for installation and repair activities by Paradise Communications.
Paradise Communications prefers cable
trays, generally, for their accessibility. However if another method is preferred,
Paradise Communications will provide information on guidelines which should be
Cable trays should be placed to minimize
the length and bending of the conduits. 4" x 12" cable trays along hallways, if
possible, in user areas. Note the locations of the lights in the hallways so there
is easy access to the tray for adds moves and changes. Not to be shared by electrical.
4" x 12" cable trays should be used
between other horizontal IDFs located on the same floor, or two 3" conduits.
Other horizontal distribution systems,
usually more costly than cable trays but having certain benefits to users in similar
applications, include under floor distributions systems and conduit run through
the wall and stubbed above the ceiling. In some cases the conduit will be run
from the faceplate to the IDF. This is referred to as a "home-run".
RELOCATION OF EXISTING
Construction of new buildings sometimes
requires the relocation of existing telecommunications facilities. Paradise Communications
will consult with Design & Construction and the architect when necessary to minimize
If necessary, Paradise Communications
will provide Design & Construction with the design and cost estimate for new outside
Conduits are used to accommodate the
larger feeder communications cable between the MDF of each building and the telephone
equipment rooms or Nodes.
Entrance conduit: Four 4" conduits
to the outside utility tunnel, pull box or manhole.
Between MDF and each IDF: Two to four
Between IDFs vertically: Two to four
Between IDFs horizontally (on the same
floor) : Two 3" conduits. (Note: Cable trays are preferred. Please see item II.)
Limit conduit runs in C, D, and E to
two 90 degree bends or equivalent, with none less than a 3' radius.
Limit the use of flex conduit.
STATION WIRING CONDUIT
One 1" conduit "home run" with pull
strings for each telephone outlet back to the nearest IDF/MDF, or
1" conduits with pull strings stubbed
up into the ceiling near the cable tray, or
For items 1 or 2, a 4" x 4" outlet
box should be covered with a standard SINGLE GANG ring to which our ModTap faceplate
and jack will attach at the station end.
"Mud rings" (metal rings placed in
the wall to receive telephone jack faceplate) with pull strings installed in the
4" Channel is becoming an economical
and functional alternative to conduits. Care is to be taken to the location of
these channels around modular furniture.
For looping conduits once the conduit
must be increased one trade size for each additional location, starting with a
NOTE: For future flexibility and cost
savings, Paradise Communications recommends that all rooms in the building be "prewired"
with some form of station conduit. This will save the users a great deal of time,
money and aggravation as the use of space changes in the future.
RELOCATION OF EXISTING
Whenever relocating outside telecommunications
facilities is necessary, Paradise Communications will work in conjunction with Design
& Construction and the architect in resolving the issue.
BUDGETING FOR TELECOMMUNICATIONS
Construction budgets for new buildings
and major renovations shall include the following budget considerations for funding
the installation of interior and exterior telecommunications cabling, and the
necessary hardware needed to activate the data communication outlets.
Allow approximately 4 weeks from the
time Paradise Communications receives final 100% construction drawings for the
design and budgetary cost estimates for electronic communications.
Exterior Cabling: Budget $50.00 per
lineal foot between point of connection (LIM site) and the MDF located inside
Because of system design limitations
with the communications equipment, Paradise Communications shall be consulted
to determine the Point of connection (LIM site) for each new building project.
Interior Building "prewire": Using
an average distance of 150' (300' maximum) from IDF's to each communications outlet,
the following unit prices would apply for placement of horizontal cabling only.
Unit prices include labor and materials.
It is very helpful when ceiling tiles
can be scheduled for installation after the inside wiring is complete. This will
keep the cost down for installing the inside wiring.
(2) 4 pair, Cat. 5 plenum: Unit Price
(2) 4 pair, Cat 5 & one (2)strand 62.5
fiber optic cable: Unit Price $ 340.00
The total cost for communications,
which includes: 1) cabling cost, 2) data equipment, 3) activation, 4) relocation
of existing voice and data services from old location, and 5) Electronic Communication
Services and Facilities Management project management fees, comes to $ 1,000 (outlet)
Changes made to communications wiring
or equipment after the building budget is submitted to Design & Construction,
will be at an additional cost to the project or to the individual department,
The Project Manager, designated by
Design & Construction, will approve these changes and determine whether the project
or the department will pay the additional fees.
Departments moving into the new facilities,
requesting additional communication services will submit a Service Request form
to Paradise Communications. The department's requesting new service will be charged
appropriately. Cost estimates will be provided by Paradise Communications upon
Departments should allow a minimum
of one month lead time from receipt of the telephone service request to install
telephones and data communications service.
Because of the length of time it takes
to acquire a contractor, Paradise Communications will need to be notified at least
3-4 months in advance of when the building cabling can begin.
Typical contractor acquisition timeline:
Prepare Bid Documents with Facilities
Management: 4-6 weeks
Design & Construction to prepare documents
for bid process: 1-2 weeks
Design & Construction to:
Written authorization to proceed:
60-90 working days to complete entire
Allow approximately 30-90 working days,
after cable trays, conduits, sleeves and drywall are installed for inside wiring
to be completed depending on the size of the installation.
Elevator telephone wiring and phones
are usually provided by the elevator supplier in the contract. Paradise Communications
will install wiring from the IDF to the elevator room at the request of the project
manager. A proper telephone service request is required.
Pay phones will be installed by Pacific
Coin / MCI. The service requests forms should be coordinated by Paradise Communications.
Original cabling completed by the contractor for the cabling.
Data communications can require a great
deal of specialized design and additional cost (above the standard cost estimate).
The requirements should be brought to our attention as early in the design process
as possible. For this reason, Paradise Communications meets with representatives
from the individual departments, approximately six months prior to occupancy.
The additional cost are usually covered by the building project.
Temporary telephone service to the
job site will be the contractor's responsibility.