Section 9, ATT-TP-76400 DETAIL ENGINEERING REQUIREMENTS
AT&T January, 2012
3.3.9 Horizontal levels shall be identified by letter designations starting with the letter A at the
bottom, omitting letters I and O. Individual blocks/terminal strips on the horizontal level shall
be identified by the associated vertical number. Designation instructions shall be provided to
the installer via the engineering spec.
3.3.10 Designations shall be provided at various points to identify the vertical number on both sides
of the conventional frame. See Section L of ATT-TP-76300 for details. Designation
instructions shall be provided to the installer via the engineering spec.
4. FRAME BLOCKS
4.1. General
4.1.1 Frame blocks fall into two general categories – Connector or Connecting Blocks and
Protector Blocks. The connector block provides no electrical protection functions. Protector
blocks provide electrical protection for OSP cable facilities that are terminated on the MDF.
4.1.2 Frame assignments shall be provided by the authorized AT&T Engineer, commonly the
Frame Planner/CSSP (Common Systems Space Planner), however, local policy shall dictate
the appropriate authorized engineer.
4.1.3 The authorized individual (generally the CSSP/Frame Planner), will be specified by the AT&T
Equipment Engineer in the TEO.
4.1.4 All blocks on the frames shall have wire wrap terminations, unless the embedded base of
existing blocks on the frame is made up of Quick-Clip/punch down, type blocks. In that case
the quick clip blocks will be allowed.
4.1.5 Bifurcated (read dual) pins are required for connecting blocks used for line equipment and
CLEC CFA terminations. This facilitates half taps for cutovers, cable throws and “from/to”
service orders.
4.1.6 Only AT&T approved frame blocks shall be used per drawing ATT-E-00087-E Note 11.
4.1.7 No variances from 4.1.6 shall be allowed.
4.2. Connector/Connecting Blocks
4.2.1 The standard connecting block for conventional frames is the non-connectorized 89-type
block.
4.2.2 The standard connecting blocks for modular distributing frames are:
• COSMIC I and IA - 78 or 112 type connecting block are the common units.
• COSMIC II, IIA and II mini - 112 type connecting block is the common unit
• Existing Reltec or Porta Frames may continue to use their respective
proprietary blocks for frame continuity and consistency. (Shall require OTA.)
4.2.3 The 78 and 112 type connector block shall not be mixed on the same COSMIC DF.
4.3. Protected Connectors
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