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Cabling
Standards: Service
Entrance and Termination Room (MDF)
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Service Entrance
and Termination Room (MDF)
This type of telecommunications room is the required service entrance
for telecommunications services (voice and data). The number and size
of inter-building conduits to this room will be determined by the number
and type of telecommunications terminations that will be brought into
the building.
In general, MDF entrance doors should open out to minimize the loss
of useable space within the MDF.
The minimum size and number of conduits to a building
is two 4” conduits.
The location shall be within 50' of the point where the electrical facilities
enter the building. Where possible, this room will be dedicated
for use by ITS for network support and services.
The basic requirements for a Service Entrance and Termination Room are
as follows.
- Required Area:
- Minimum area is 6' X 6' for a MDF with less than 100 voice and/or
data connections.
- Minimum area is 6' X 8' for a MDF with 100 – 200
voice and/or data connections.
- Minimum area is 8' X 10' for a MDF with 200 to 300 voice and/or data
connections.
- Minimum area is 10’ X 12’ for a MDF with > 300
voice and/or data connections.
- Height: Minimum ceiling height
is 9' 6", with
the bottom of the exposed structure considered the ceiling.
- Conduits/Sleeves: Location,
number, and size of conduits and sleeves between the Service Entrance
and Termination Room, Equipment Rooms, and Telecommunications Rooms
will be provided during the design phase of the project. Conduits
and sleeves shall extend 4" above floor level or through the wall. For most buildings this
will be two 4” conduits between the Service Entrance and Termination
Room, Equipment Rooms, and Telecommunications Rooms.
- Door: Rooms shall have a fully-opening,
lockable door which is at least 36" wide and 80" in height.
- Interior Finishes: To minimize dust, floors shall
be vinyl composition tile and all exposed concrete, brick and gypsum
board walls shall be painted or sealed.
- HVAC: Rooms shall have HVAC to control temperature
and humidity, unless the facility can maintain the temperature in the
room at a range of 65 to 85 degrees with all installed equipment powered
on and operating. The specific BTU's of heating and cooling to be provided
will be specific to each building. Humidity shall be controlled at
50% +/- 15%.
- Plumbing: Service Entrance and Termination rooms
should not have any water pipes within the room's interior space, routing
horizontally on the floor directly above the room, or within the floor
slab below the room.
- Grounding: Provide a building ground wire, with
bus bar, to the room. Locate the bus bar at the lower left corner of
the plywood backboard. ITS will indicate on which backboard to place
the bus bar. Refer to Grounding section of these standards.
- Lighting: Provide minimum lighting to be equivalent
of 540 lux (50 footcandles) measured 3 feet AFF.
- Plywood Backboard Panels: Each
wall that has an equipment rack or cable ladder attached to it, shall
have 3/4" X
4' X 8' sheets of A-C Grade, Fire-Retardant-treated plywood installed
on them for anchoring termination strips and other devices.
- The plywood shall reach from corner to corner.
Install the plywood vertically at 6" AFF and anchor securely
to wall substrate with a minimum of five (5) equally spaced fasteners
along each vertical edge and down the centerline of each sheet of
plywood.
- Fasteners shall be of the appropriate type for each substrate. Provide
blocking or additional studs in framed walls to receive plywood backup
panel fasteners.
- Paint the plywood with two coats of fire retardant low-gloss, light-colored
paint.
- Electrical: On each wall, except the wall containing
the door, install two A/C 20-amp electrical four-plex outlets, evenly
spaced. Refer to Power section of these standards.
- Floor Loads: Floors shall be designed to support
100 lbs per square foot at a minimum.
- Telecommunication Rack(s): Install
an 8’ tall
and 19” wide telecommunications rack, without panels, to support
fiber and cable termination devices and network electronics. Locate
the rack in the room so that there is sufficient space to work behind
it for installation and maintenance. Fasten the rack to the floor
and bond the rack to the ground bus. Location and manufacturer of the
rack will be identified by ITS during the design phase of the project. Install
an electrical four-plex outlet in the rack to support a UPS which will
be located on the floor within the rack. The size of the UPS and type
of the receptacle will be determined during the design phase.
Download Example of MDF and Rack Layouts http://www.smccd.net/accounts/itwirespecs/img/RackLayouts.pdf
Download Example of MDF and IDF floor palns
http://www.smccd.net/accounts/itwirespecs/img/mdf_idf_floorplans.pdf
Download Example MDF Rack Layouts
http://www.smccd.net/accounts/itwirespecs/img/MDF_Rack_layouts.pdf
Cable Tray: Install cable tray from the cabinet
to the plywood backboard. Bond the cable tray to the ground bus. Location
and manufacturer of the cable tray will be identified by ITS during
the design phase of the project.
Room Size Verification: When the Service Entrance
and Termination Room is also used as an Equipment Room and/or Telecommunications
Room, the size of the room shall be sufficient to accommodate the type
and number of the services being supplied to the building. ITS will
provide the size of the room, based on the type and amount of services
required to support the building. ITS will also take into consideration
the intended use of the building when determining the size of the Service
Entrance and Termination Room.
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