DETAIL ENGINEERING REQUIREMENTS Section 9, ATT-TP-76400
AT&T January, 2012
forms: conventional distributing frames and Universal Modular distributing frames. More
detailed descriptions of frame types can be found in section 3 of this document.
2.1.4 In most instances the DF equipment to be installed will be purchased new from an approved
manufacturer. However, in some cases the equipment may be supplied to the Installation
Vendor through the AT&T reuse program or by way of a direct transfer from one Carrier
Communications Space to another. When used equipment is supplied by the Installation
Vendor from another source, it shall be accompanied by a 10 year warranty provided by the
Installation Vendor. This written warranty shall provide coverage for both cosmetic and
structural defects. The Installation Vendor will be held responsible for all costs associated
with the repair or replacement of the equipment during the 10 year warranty period.
Additionally, used equipment furnished by an Installation Vendor shall have the word
“Salvaged” and the warranty expiration date, (10 years from the installation date) added to
the standard labeling.
2.2. Zoning and Spread Complete
2.2.1 All MDF’s shall be zoned. Zoning refers to the practice of logically dividing the frame, where
practical, into multiple vertical sections, or zones. The vertical and horizontal sides of an
MDF are zoned independently of each other. Zoning is utilized to exploit the short jumper
concept, in which an assignment algorithm is used to ensure the shortest possible jumper
lengths.
2.2.2 Spreading is defined as the placement of related equipment in several locations on the frame,
e.g. rather than placing all OE in a concentrated location on the DF, it is spread across the
frame. This is done in conjunction with the corresponding spread of OSP terminations on the
vertical side of the frame. This keeps the jumper wires that are run on the frame shorter, the
frame less congested, and prevents premature exhaustion of the frame hardwire.
2.3. Distributing Frame Functions
2.3.1 Main and Intermediate Distributing Frames. The primary copper facility frame is known as
the Main Distributing Frame (MDF). The MDF is the frame that has the standard terminations
of the local indigenous switch OE/LEN facilities, cable pairs to the customers and tie pairs to
other frames and equipment.
2.3.2 In multiple conventional frame central offices, it is recommended that transport and CLEC
terminations be placed on the IDF unless the MDF has sufficient space to support these
terminations and still allow for ILEC growth. Transport and CLEC terminations shall not be
placed on a COSMIC MDF.
2.3.3 Transport, CLEC and other miscellaneous terminations, located on the Intermediate
Distributing Frame (IDF) shall be connected via Inter-Frame Tie cables to the MDF.
2.3.4 Existing MDF’s may be either conventional or modular. If the MDF is modular, a conventional
IDF is required and shall be placed to support it.
2.3.5 The primary functions of distributing frames are:
• Termination of Facilities/Equipment.
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