DETAIL ENGINEERING REQUIREMENTS Section 9, ATT-TP-76400
AT&T January, 2012
3.2.3 The modular distributing frames are a sheet metal structure designed for single-sided cross-
connect operation. This means that all terminations from both subscriber facilities and from
office equipment are accessible for cross connection from one side. Outside plant cable
pairs (CP) and line equipment (LE) pairs are normally terminated in alternating modules. The
modular framework groups consist of vertical jumper troughs between modules and express
wiring troughs at the top and bottom of each module. With the proper spread of cables and
equipment, the jumpers need be no longer than from one module to the next module. They
can be engineered with or without separate protector frames for most applications.
3.2.4 Modular distributing frames use the preferential assignment concept. Computerized frame
administration systems are used to spread the outside plant cables and equipment cables
over the length of the frame. Facilities and equipment are selected based on physical
proximity on the DF. The resulting short jumpers reduce congestion and improve network
operations efficiency. AT&T uses FrameMate as a mechanized DF administration system for
this purpose.
3.3. Conventional Distributing Frames
3.3.1 Conventional distributing frames are characterized by open ironwork construction with vertical
apparatus mounting frame members on one side and horizontal members on the opposite
side. Most conventional frames are designed for double-sided cross-connection operations;
however, some single-sided versions are available. Adapters used to mount different types
of apparatus on frames are identified on manufacturer’s frame hardware drawings. Virtually
all conventional frames can be arranged for application with or without separate protector
frames.
3.3.2 Conventional distributing frames, unlike protector frames, have cross-connecting features
including shelves and “D” rings to route jumper wire and connecting apparatus specifically
designed for frequent jumper connections and disconnects.
3.3.3 There are many variations in conventional frame heights, widths, and hardware-mounting
dimensions to accommodate specific applications and Carrier Communications Space
building sizes. The standard for new installations shall be the 8’ 10” high double-sided DF
system.
3.3.4 Copper cable pairs and derived pair gain terminations on conventional frames are mounted
on vertical uprights. Transport/Switch and other miscellaneous termination units are mounted
on horizontal levels.
3.3.5 Verticals shall be spaced on 8-inch centers unless otherwise specified by the AT&T
Equipment Engineer. Some special application frames have 6 1/2-inch vertical spacing.
3.3.6 Horizontals shall be spaced on 8-inch centers. Older frames may have 10-inch spacing.
Current standards call for 8 inch centers for both verticals and horizontals.
3.3.7 Verticals shall be numbered consecutively (usually from the non-growth end to the growth
end) starting with number 1. The first vertical is ordinarily not furnished with jumper rings and
is not used for terminating facility cable pairs.
3.3.8 The first vertical of a frame is usually reserved for plug-up and test line protectors.
9-5
(652 Seiten)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Kommentare zu diesen Handbüchern