Section DTW-A52-814-201 030-101657 Rev. A R
40801I1RA
3. Separate the mounting backplate from the shelf assembly.
Next, remove the backplate from the shelf assembly by loos-
ening the thumbscrew at the top center of the assembly’s
PCB backplane.
4. Determine the mounted location on wall. Ensure the as-
sembly will be mounted in a location with unobstructed
access to it and which has adequate room to allow the
mounting’s front door to be opened, and that adequate hor-
izontal and vertical space be left between multiple
installations to allow for proper cable access and ventila-
tion.
5. Mark the mounting hole locations to be drilled. Using the
removed backplate as a template, lift the backplate to the
exact installation location on and against the approved wall,
per company practice, and then mark the exact mounting
hole locations to be drilled for the mounting hardware.
6. Drill holes. Set aside the backplate and drill appropriately-
sized holes to accommodate the mounting hardware, per
the wall type and per company practice. The size of the
holes and the fastening hardware varies according to the
wall type. Do not make the holes too large.
7. Secure backplate to wall. Lift the backplate, place it against
the wall so the four recessed mounting hole indentations con-
tact the wall, and install mounting screws or bolts through each
predrilled hole in the backplate and into the predrilled holes in
the wall. Verify the backplate is firm and snug up against the
wall.
8. Attach assembly to backplate on wall. Lift and align the as-
sembly’s four, angled, mounting clips at the back of the
assembly (see Figure 3) with the four angled tabs on the
backplate, then carefully hang the assembly on the tabs.
Tighten the captive shelf thumbscrew.
9. Continue with installer connections. Re-install the cover
and close up the assembly as stated in Paragraph 2.10 after
all installer connections are made, modules are inserted,
and testing is complete.
2.5 Facility/Network Interface Connections
Facility connections are made to the assembly by connecting
two, 25-pair, female, connector cables to the two, 25-pair,
male connectors designated P1 (RCV) and P2 (XMT), lo-
cated on the front of the printed circuit board backplane. See
Table 1 for wiring information. An alternate method for mak-
ing facility connections to the shelf may be provided via
wirewrap pins located at the top right and bottom right of the
PCB backplane. Wirewrap pin connections are made by wire-
wrapping the appropriate leads from the facility to the pins
designated XMT and RCV for each circuit. Use shielded,
twisted pair cable of a length and gauge consistent with local
installation practices. Refer toTable 1 and the PCB silkscreen
for 56-pin card-edge pin assignments, lead designations, and
circuit position identification.
2.6 Customer Interface Connections
Customer Interface connections are made to the CIM located
on the side of the mounting, via either separate XMT and
RCV telco connectors or via the RJ48C/S modular jacks. See
Table 1 for 25-pair connector and for RJ48C/S jack wiring in-
formation. Set each circuit’s jack switch to the proper jack
switch type position, per company practice and the proper ap-
plication.
- GROUNDING NOTE -
Always follow the National Electrical Code (NEC) rules, local safety pre-
cautions, and standard operating procedures for grounding the equipment
when installing, upgrading, repairing or maintaining equipment. Any in-
structions or information contained herein is subordinate to local codes,
operating procedures or practices.
2.7 Chassis/Frame Ground Connections
An externally-approved, separate and direct, earth ground
connection (#6 to #14 gauge wire) must be connected to the
FGND (Frame Ground) screw terminal of TB1 or the single bar-
rel offset copper ground lug, located on the lower left-hand side
of the mounting. This must be done in order to properly ground
the assembly’s framework as well as all Network Interface Device
front panels. The offset ground lug will accept a #6 to #14 gauge
ground wire.
2.8 Power Connections
A 6-position terminal strip, TB1, is provided for making the local,
external, 48-volt and ground connections. The first two screw ter-
minals on TB1 are labelled -48VA" and GND A," while the next
two are labelled GND B" and -48VB." Either set of screw ter-
minals can be used for main power (A) while the second set of
screw terminals (B) can be used for the back-up or redundant
power source. The last two screw positions are labelled
FGND" and ALARM". A customer-provided, plug-in, pow-
er supply module can be installed in the right-most slot of the
mounting, if desired.
- CAUTION -
Never apply power until all installer connections are made.
2.9 Module Installation
The DTWA528-14 holds up to fourteen 200 MECHANICSr
type or seven 400-Type DS1, HDSL, DDS or Analog Data/
Voice-type modules. Set all module switch options and install
all modules per manufacturer instructions and company prac-
tice.
- CAUTION -
Use care when installing and removing modules - do not force
a module into place. If a module resists insertion, remove it
and check for obstructions in or near the module’s or shelf’s
connectors and mounting slots. The module may then be
carefully aligned and gently re-inserted.
