Section 9, ATT-TP-76400 DETAIL ENGINEERING REQUIREMENTS
AT&T January, 2012
6.4. The FDF
6.4.1 Physically, A 7-ft Bay can house up to (9), 7" High, Fiber Chassis. These chassis can be
Fiber Terminations, Optical Splitters or Wave Division Multiplexers. These (3) chassis types
may be placed into any of the (9) available bay positions. All chassis growth within the bay
shall start with position (1) at the bottom and grow up ending with position (9).
6.4.2 All passive devices shall conform to the AT&T Company’s standard for the vertical
Miscellaneous Panel (12-slots modules) only. The Miscellaneous panel shall be the only
version permitted on the Generation II and future Generation III FDF.
6.4.3 The FDF shall be limited to a seven-foot environment.
6.4.4 The FDF shall be ordered to include storage of excess jumper slack between bays.
6.4.5 The Generation II FDF uses a high-density trough system that permits the routing of fiber
optic cross-connect jumpers of varied lengths to fit into the system without the need to
custom fit or splice connectors.
6.4.6 In small AT&T locations the first FDF bay can be used in a combination mode with the FOT
panels on the bottom and the OSP panels on the top. Any growth beyond the first bay shall
require the existing pattern be carried out through out the lineup. If in doubt as to the growth
of the office, then care should be used to place the frames in the normal arrangement of
OSP-FOT-OSP-FOT….
6.4.7 The Generation III FDF shall have a different physical placement requirement of the lineup.
The lineup shall be placed to accommodate both front and rear access providing for full 36-
inches between parallel lineups on both front and rear. If a new lineup is started using the
Generation III bays after an embedded Generation II (standard bay) arrangement is already
in service, strive to place the new lineup adjacent to the Generation II lineup, or within the
closest proximity. A transition bay from the NGF to the NG3 will be required to migrate from
these two Generation III systems.
6.4.8 A Fiber Optic Jumper is defined as a cross-connection within the FDF to connect the OSP
termination shelf to the FOT shelf. A Fiber Optic Patch cord is defined as a connection
between the FOT shelf in the FDF and the Network Element.
6.4.9 Fiber optic jumpers and patch cords shall be ordered in the near correct lengths in order to
interconnect between FDF panels or FDF panels and network elements.
6.4.10 Fiber optic jumpers shall not be less than 6 feet in length.
6.4.11 On AT&T FDF systems, the fiber jumpers shall be provided in 5-foot increments, but shall not
be less than 6-feet for any one-jumper cross-connect.
6.4.12 Fiber Optic jumpers and patch cords shall be ordered from an approved AT&T supplier.
6.4.13 In locations where there is an existing lineup of the old style LGX bays and that lineup still
has room to grow it is permitted to continue the lineup with the same style bay until that
lineup is maxed out without the need for a waiver.
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(652 paginas)
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