Westell DTWA528-14 Series User manual

Equipment Issue A
030-101657 Rev. A, January 2008
Section DTW-A52-814-201
R
ECopyright 2008 EWestell, Inc. All rights reserved.
*CLEI is a trademark of Telcordia Technologies. Westellrand 200 MECHANICSrare registered trademarks of Westell, Inc. Page 1 of 7
0801I1RA
Westell DTWA528-14 Series of
14-Position Digital Terminating Wall Assemblies
CONTENTS PAGE #
1. GENERAL 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. INSTALLATION 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. TESTING & TROUBLESHOOTING 6. . . . . . . . . . . . . .
4. CUSTOMER & TECHNICAL SERVICES 7. . . . . . . . .
5. WARRANTY & REPAIRS 7. . . . . . . . . . . . . . . . . . . . . . .
6. SPECIFICATIONS 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. GENERAL
1.1 Document Purpose
This document describes the Westell DTWA528-14 Series of
14-Position Digital Terminating Wall Assemblies, shown in
Figure 1. See Table 2 for information concerning other mod-
els in the same product family.
- NOTE -
Hereafter, the DTWA528-14 Series of Digital Terminating Wall
Assemblies may be referred to as the DTWA528-14,"
assembly," or mounting." Specific model numbers will be used
where key differences apply.
1.2 Document Status
Whenever this practice is updated, the reason will be stated in
this paragraph. This practice replaces document number
785-000117, deletes the List 1, 2, 3, and 8 models, and provides
a general editorial update.
1.3 Product Purpose and Description
The DTWA528-14 is a 14-position mounting that holds up to
fourteen 200 MECHANICSrDS1 Network Interface Units
plus provides a dedicated slot for a modular power supply.
Facility connections are made to wirewrap pins or to two, sep-
arate, Transmit (XMT) and Receive (RCV), 25-pair, male
connectors. Refer to Table 1 for facility-side wiring connec-
tions.
The DTWA528-14 provides a unique easy-access method for
CPE wiring connections. A convenient Customer Interface
Module (CIM), with 14 individual and switch-selectable
RJ48C/S jacks plus two, separate, male, 25-pair connectors
(one for transmit and one for receive), can mount on either
the left or the right side of the mounting. The switches allow
the installer to select either an RJ48C, RJ48S, or an RJ48H
Figure 1. Front View of DTWA528-14 Digital
Terminating Wall Assembly
interface for each circuit, to satisfy a variety of DS1 Digital
Services, Digital Data Services, or Leased Line Analog Ser-
vices.
1.4 Product Mounting
The DTWA528-14 is typically mounted on an approved wall.
1.5 Product Features
The DTWA528-14 offers the following features.
SCompact and light-weight, holds up to 14 DS1, HDSL,
DDS or Analog Data circuits (200 MECHANICSr)
SPrewired connectorized backplane minimizes wiring errors
and installation time
SFacility connections are made to separate, 25-pair, XMT
and RCV connectors or to wire-wrap pins
SCPE connections made at the unique, removable, CIM
module, which contains two, 25-pair, male connectors (one
for XMT and one for RCV), and 14 switchable RJ48C/
RJ48S modular jacks
SCan be used in backup or redundant power applications

Section DTW-A52-814-201 030-101657 Rev. A R
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Figure 2. Front View of DTWA-528-14, Cover Removed
1410 1312 PWR11
143287
POS13 POS14 POS12 POS11 POS10
POS9 POS8 POS7 POS6 POS4 POS5 POS3 POS2
POS1
CKT8 PWRCKT9 CKT10 CKT11
CPE−− L
CKT12 CKT13 CKT14CKT7CKT6CKT5CKT4CKT3CKT2CKT1
P1
P2
GN D B -48V B ALARM FGND
RCV FROM FACILITY
RCV FROM FACILITY
XMT TO FACILITY XMT TO FACILITY
GN D
R1
T1
GN D
R1
T1
GN D
R
T
GN D
R
T
External power connections
Backplate screw FACILITY −− XMT
wire wrap pins
FACILITY−− RCV
FACILITY−− RCV
Amphenol type connector
FACILITY −− XMT
Amphenol type connector
on left side.
Power supply slot
-48V A GN D A
Gnd Lug
Connector for
mounting CIM
CIM
(shown mounted
on right side)
Thumb screw (1 of 2)
to secure CIM module
to side of DTWA528-14
for optional
customer-provided
power supply
wire wrap pins
56 9
SAvailable with key locking metal cover complete with see-
through, Lexan, front door
SReversible cover allows door opening from the left or right
SWell-suited for confined corner wall-mounting due to the
unique CIM module, which plugs into either the left or right
side of the DTWA528-14, for easy CPE access
2. INSTALLATION
Installation consists of inspecting the equipment for damages,
following proper safety precautions, mounting the assembly on
a wall, and making all installer wiring connections. The following
paragraphs provide instructions for performing these proce-
dures.
- INSPECTION NOTE -
Visually inspect the unit for damages prior to installation. If the
equipment has been damaged in transit, immediately report the
extent of the damage to the transportation company and to West-
ell (see Part 6 for telephone number).
CAUTION - STATIC-SENSITIVE
This product contains static-sensitive components! Proper
electrostatic discharge procedures must be followed to
maintain personal and equipment safety. Do not store units
near magnetic, electromagnetic or electrostatic fields. Always
store or ship units in the original static-protective packaging
from Westell. Use anti-static mats when working on units.
- PRECAUTIONARY STATEMENT -
Never install telephone wiring during a lightning storm.
Never install telephone jacks in wet locations unless the jack
is specifically designed for wet locations.
Never touch uninsulated telephone wires or terminals unless
the telephone line has been disconnected at the network
interface.
Use caution when installing or modifying telephone lines.
2.1 Pre-Mounting Considerations
This assembly is to be installed by authorized, trained person-
nel only, in accordance with local practices for High Capacity
(1.544 Mb/s) Digital Services, Digital Data Services or Leased
Line Analog Services. In accordance with UL1950, this
mounting enclosure is suitable for mounting over concrete or
other non-combustible surfaces only. The assembly should be
located in an area that provides adequate lighting, climate
control and equipment access.
2.2 Important Safety Instructions (Please Save)
When using your telephone/telecommunications equipment,
basic safety instructions should always be followed to reduce
risk of fire, electric shock and injury to person, including the
following:
A. Read and understand all instructions.
B. Follow all warnings and instructions marked on product.
C. Do not place this product on an unstable cart, stand or table: the
product may fall, causing serious damage to product.

Section DTW-A52-814-201
030-101657 Rev. A
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Position shelf against
backplate (about 1/2"
higher than backplate,
then lower the shelf
straight down so the 4
mounting clips on the
shelf fit into the 4 tabs on
the backplate.
Tighten shelf
screw to secure
shelf.
Figure 3. Mounting the Backplate and Shelf Assembly
Mounting
Backplate
Mount the
backplate se-
curely to the
wall using four
screws as
shown
PWRPWR28282727262625252424232322222121202019191818171716161515
FACILITY−RCV (CIRCUITS 1−14)FACILITY−RCV (CIRCUITS 1−14) P1P1
Shelf
Mounting clips attach
to backplate tabs
Tab
Tab
Remove
cover
Loosen thumb-
screw to remove
backplate
D. Slots and openings in the cabinet and the back or bottom are pro-
vided for ventilation. To protect it from overheating, these
openings must not be blocked or covered. This product should nev-
er be placed near or over a radiator or heat register. This product
should not be placed in a built-in installation unless proper ventila-
tion is provided.
E. This product should be operated only from the type of power
source indicated on the marking label.
F. Never push objects of any kind into this product through cabinet
slots as they may touch dangerous voltage points or short out parts
that could result in the risk of fire or electrical shock. Never spill liq-
uid of any kind on the product.
2.3 Tools and Supplies
The following tools and supplies are required to wall-mount the
DTWA528-14.
SFlat-blade screw driver (to adjust the terminal block screws
and to adjust the mounting screws and ground lug)
SWire strippers (for signal, power, and ground wires)
SDrill and drill bits (to drill holes for mounting screws/bolts)
SWirewrap tool (if using wirewrap pin connections)
SGrounding materials and equipment
SWall mounting hardware (four screws or bolts)
2.4 Wall-Mounting the Assembly
The DTWA528-14 is designed to be directly mounted to an
approved wall. Follow the instructions below and refer to
Figure 2 through Figure 4 as needed to mount the assembly.
- CIM LOCATION NOTE -
The CIM module for customer connections is located or
mounted on the right side of the mounting assembly, with the as-
sembly door opening from the right side; however, these positions
can be reversed if the CIM is removed and attached to the left side
of the mounting assembly (also flip the mounting assembly’s cov-
er to allow the door to open from the left side.
1. Prepare the assembly. Remove the front cover by loosening
the thumbscrews on the sides of the assembly. Also use the
provided key to unlock the keylock, if mounting a key-lock-
ing model.
2. Remove the cover. Slide or lift off the cover and set it aside.

Section DTW-A52-814-201 030-101657 Rev. A R
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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.

Section DTW-A52-814-201
030-101657 Rev. A
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5
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PWRPWR28282727262625252424232322222121202019191818171716161515
P1
Shelf
Customer Interface Module
(CIM) mounted on left side Customer Interface Module
(CIM) mounted on right side
Cover is flipped over
if CIM is mounted on left side.
With CIM mounted on
left side, flip cover
over, place on shelf,
slide to right and
tighten the cover
screws.
With CIM mounted on right
side, place cover over shelf,
slide to left and tighten the
cover screws.
Cover screws
Wall
DTWA−528−14
POS8
CPE −XMT
CPE −RCV
POS13 POS11 POS9 POS14 POS12 POS10
POS1POS7 POS5 POS3
POS2POS6 POS4
Tie−wrap
Wall
DTWA−528−14
POS8
CPE −XMT
CPE −RCV
POS13 POS11 POS9 POS14 POS12 POS10
POS1
POS7 POS5 POS3
POS2
POS6 POS4
Tie−wrap
Tie−wrap
CPE −XMT
CPE −RCV
DTWA−528−14
POS8
POS13 POS11 POS9 POS14 POS12 POS10
POS1POS7 POS5 POS POS2POS6 POS4
Wall
Tie−wrap
Wiring using RJ48C jacks w/CIM mounted on
right side. (Note: Only first 4 positions are shown)
Amphenol-type Connectors
with CIM mounted on right side
Amphenol-type connectors w/
CIM mounted on left side
Figure 4. Mounting the CIM Module and Making Customer Connections
FACILITY−XMT
FACILITY−RCV (CIRCUITS 1−14) T1
R1
GND
POS 1 POS 2 POS 3 POS 4 POS 5 POS 6 POS 7 POS 8 POS 9 POS 10 POS 11 POS 12 POS 13 POS 14
Attaching CIM
Installing or
reversing the cover
Making customer connections

Section DTW-A52-814-201 030-101657 Rev. A R
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P1
RCV FAC
(Male)
P2
XMT FAC
(Male)
J1
RCV CPE
J2
XMT CPE
RJ48C
CPE Jack
RJ48S
CPE Jack
Circuit
25−Pin
Connector
Color Code
Lead
Designation
56−Pin
Connection
Lead
Designation
56−Pin
Connection
Lead
Designation
56−Pin
Connection
Lead
Designation
56−Pin
Connection
Lead
Designation
RJ48C
Connection
Lead
Designation
RJ48C
Connection
Lead
Designation
RJ48S Connection
Lead
Designation
RJ48S Connection
126 (W–BL)
1 (BL–W)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
227 (W–O)
2 (O–W)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
328 (W–G)
3 (G–W)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
429 (W–BR)
4 (BR−W)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
530 (W–S)
5 (S–W)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
631 (R–BL)
6 (BL–R)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
732 (R–O)
7 (O–R)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
833 (R–G)
8 (G–R)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
934 (R–BR)
9 (BR–R)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
10 35 (R–S)
10 (S–R)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
11 36 (BK–BL)
11 (BL–BK)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
12 37 (BK−O)
12 (O–BK)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
13 38 (BK–G)
13 (G–BK)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
14 39 (BK–BR)
14 (BR–BK)
T
R
7
13
T1
R1
41
47
T
R
55
49
T1
R1
5
15
T
R
5
4
T1
R1
2
1
T
R
2
1
T1
R1
7
8
Table 1. DTWA528-14 Facility and CPE Wiring Chart
2.10 Closing the Assembly
After all connections are made, power and ground connec-
tions are properly terminated, and all modules are optioned
aligned, and tested, the front cover can be replaced. See
Figure 2 through Figure 4 for detailed diagrams and wiring
information. Place the front cover over the shelf assembly and
slide the cover to the left. Tighten the front cover thumb-
screws securely. Make sure the cover is positioned properly
over the CIM module. Lock the assembly with the key, if ap-
plicable.
3. TESTING & TROUBLESHOOTING
3.1 Testing
Testing may be done after all wiring and power connections are
made and units are installed. Refer to the appropriate document
for the modules used. If trouble is encountered, verify all con-
nections are properly made to the assembly. Verify switch option
settings of the modules installed.
This equipment should not be field repaired. If the equipment
is suspected of being faulty, replace it with another unit, op-
tioned identically, and retest. If the replacement unit appears
to operate correctly, the original unit may be faulty and should
be returned to Westell for repair or replacement (Paragraph
5.2).
3.2 Troubleshooting
If trouble is encountered, verify all installer connections to
the assembly and check that the CO power fuse is not blown.
Also verify all module connections and option switch settings,
and verify the modules are making a positive connection with
the shelf connector. If trouble persists, replace the suspect
unit and repeat procedures outlined. These procedures are
not designed to effect repairs or modifications. Any tests be-
yond those outlined herein, or repairs made beyond replacing
a faulty unit, are not recommended and may void the warran-
ty.

Section DTW-A52-814-201
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4. CUSTOMER & TECHNICAL SERVICES
4.1 Customer Service & Technical Assistance
If technical or customer assistance is required, contact West-
ell by calling or using one of the following options:
Voice: [phone]
email: [email protected]
For additional information about Westell, visit the Westell
World Wide Web site at http://www.Westell.com.
4.2 Part Numbers
This equipment is identified by a product number
(DTWA528-14), which consists of three parts: the assembly
type (DTWA − Digital Terminating Wall-mount Assembly)
and model number (528-14). If an option is provided, it is indi-
cated with a suffix (DTWA528-14L4).
5. WARRANTY & REPAIRS
5.1 Warranty
Westell warrants this product to be free of defects at the time
of shipment. Westell also warrants this product to be fully
functional for the time period specified by the terms and con-
ditions governing the sale of the product. Any unauthorized
equipment repair or modification attempts will void the war-
ranty.
5.2 Repair and Return
Westell will repair or replace any defective Westell equip-
ment without cost during the warranty period if the unit is
defective for any reason other than abuse, improper use, or
improper installation. To return defective equipment, first re-
quest a Return Material Authorization (RMA) number from
Westell by calling or using one of the options shown below.
Once an RMA number is obtained, return the defective unit
(freight prepaid), along with a brief problem description, to
the address we will provide to you when you contact us.
Voice: [phone]
email: [email protected]
Replacements will be shipped in the fastest manner consis-
tent with the urgency of the situation. Westell will continue to
repair or replace faulty equipment beyond the warranty peri-
od for a nominal charge. Contact Westell for details.
6. SPECIFICATIONS
6.1 Ordering Specifications
To order units, call the telephone number shown in Paragraph
4.1 and please specify a specific model number shown in
Ta b l e 2 .
Model # Description
DTWA528-14L4-5 14-Position Digital Terminating Wall-mount
Assembly w/keylock and CIM module.
DTWA528-14L5-14 Same as above but without the keylock and also
ties pins 2, 11, and 27 to ground.
CLEI* Code: VAM2YV7HRA. Barcode/ECI: 439610. CPR: 203445.
*CLEI is a trademark of Telcordia Technologies.
Table 2. Ordering and Option Information
6.2 Electrical and Physical Specifications
The electrical and signalling specifications are listed below,
and the physical specifications are shown in Table 3.
A. Power: -48Vdc
Physical Feature U.S. Metric
Height 10 in. 25.4 cm
Width 13.5 in. 34.29 cm
Depth 7.4 in. 18.8 cm
Weight (approx., empty) 20 lbs. 9.07 kg
Operating Temp. -40°to 149°F -40°to 65°C
Humidity 0 to 95% (non-condensing)
Table 3. Physical Specifications