Section 9, ATT-TP-76400 DETAIL ENGINEERING REQUIREMENTS
AT&T January, 2012
5.1.2 By contrast, the DCS is an electronic and/or optical cross-connect method for the same
services. Examples of services and applications which may terminate on the DCS are ones
such as: Potential rearrangement customers, Transport traffic, DS3-STS1-DS1-DS0-OC
Multiplexing functionality, Software conversions from DS3-STS1 and back, Regeneration of
signals, and Network reconfiguration services.
5.1.3 The following fundamental functions performed at a DSX frame are: Termination, Cross-
Connecting, Testing, Patching and Rolling.
5.2 DSX-1 Considerations
5.2.1 Planning of the DSX1 lineup will dictate careful consideration of the Carrier Communications
Space layout. It is important to place the DSX1 lineups (if multiple) in a parallel arrangement
with appropriate troughs for adequate jumper placements.
5.2.2 The length of the continuous lineup may be up to 80 feet with the correct provisions.
5.2.3 DSX-1 Rear Cross Connect bays/line-ups shall require rear aisle lighting to meet with the
minimum foot candle requirement for Equipment Frame Area Maintenance Aisle standards as
described in Table 6-3 of Section 6 in ATT-TP-76400.
5.3 Interbay Patch Panels
5.3.1 Interbay patch, or Beltline, panels, give local personnel the ability to patch/restore circuits
without using excessively long cords (short cords to the panels on either end with engineered
cable between the panels).
5.3.2 New DSX1 and DSX3 lineups shall have one inter-bay patch panel appearance every five
bays.
5.3.3 Unless specifically stated in the TEO for any existing four bay interbay panel configurations,
continue to use those same bays for additional interbay panels from new lineups and
extensions of existing bays using the five bay formats. When the next new interbay is
identified, place it five bays away from the last four bay interbay panels on the end cap.
Continue on the existing lineups using the five interbay formats. Connect these to the
existing four bay interbay panels interspersed throughout the frame. Any existing pattern
other than the one per five arrangements shall be capped.
5.4 Cross-Aisle Tie Pair Panels & Bridges
5.4.1 Cross-aisle tie pair panels are used in DSX1/DSX3 lineups to provide the ability to cross-
connect two DS-1 or DS-1C/DS-3 or STS-1 circuits terminated on different DSX1/DSX3
lineups.
5.4.2 The DSX1 cross-aisle tie circuits consist of five wires terminated at each end on the rear of a
cross-aisle tie pair panel. Some older DSX1 equipment may use six wire cross-connections,
with the sixth wire used to connect the ground leads from the fuse and alarm panels. This
insures a consistent ground reference for tracing lamps.
5.4.3 These tie pair panels shall be strategically placed in the same interbay panel bays in both
DSX1/DSX3 lineups to avoid tie pair cable congestion and long cross-connect jumpers.
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