Westell OmniPak 8 User manual

Equipment Issue A
030-101678 Rev. A, March 2008
Section 28M-A20-8A0-20A
R
0803IARA
ECopyright 2008 EWestell, Inc. All rights reserved. 200 MECHANICSrand Westellrare
registered trademarks of and OmniPaktis a trademark of Westell, Inc. Page 1 of 12
WestellOmniPak8
28MA208A Series of 8-Slot, Universal, Data Mounting Assemblies
CONTENTS PAGE #
1. GENERAL 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. OPTIONS & FEATURES 2. . . . . . . . . . . . . . . . . . . . . . .
3. INSTALLATION 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. TESTING & TROUBLESHOOTING 10. . . . . . . . . . . . .
5. CUSTOMER & TECHNICAL SERVICES 10. . . . . . . .
6. WARRANTY & REPAIRS 10. . . . . . . . . . . . . . . . . . . . . .
7. SPECIFICATIONS 10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. GENERAL
1.1 Document Purpose
This document describes the Westell OmniPakt8 8-Slot, Uni-
versal, Data Mounting Assemblies, models 28MA208A and
28MA208AP. A typical model is shown in Figure 1.
- NOTE -
Hereafter, both models may be commonly referred to as the
OmniPakt8" or the assembly." Specific model numbers will be
used where differences apply.
1.2 Document Status
Whenever this practice is updated, the reason will be stated in
this paragraph. This practice replaces document 030-101467
for the 28MA208A and 28MA208AP OminPakt8 models.
1.3 Product Purpose and Description
The OmniPakt8 is a compact, universal, data mounting as-
sembly that houses either four 400-type plug-in modules or up
to eight half-width (200 MECHANICSr-type) plug-in mod-
ules, plus an optional AC power supply. The OmniPakt8 can
be used in a variety of applications, depending on the type of
plug-in module(s) installed in it. Installed modules may be any
of the following types.
ST1 Network Interface Units (NIUs)
SHDSL Remote units (HTU-R)
SDigital Data System Network Interface Units (DDS-NIUs)
SDSTs in analog data service applications
SAny combination of the above four items
- NOTE -
To maintain the UL Listing of these mountings, only UL recognized
modules are to be used.
Figure 1. Isometric Front View of OmniPakt8,
Model 28MA208A
Mounting Template on Last Page
A variety of input and output wiring options are included to fa-
cilitate installation. Some models include a power supply for
local power applications, and all models provide an input for
external local power. The OmniPakt8 offers security features
to help prevent unauthorized access to the plug-in modules and
the Facility/Telco wiring area (see Table 1). Modules installed
in the mounting assembly can be either span or locally pow-
ered.
1.4 Product Mounting
The OmniPakt8 is typically mounted to a wall or an equip-
ment backboard at the customer premises. See Table 1 and Part
3 for more information.
1.5 Product Features
The OmniPakt8 offers the following features.
SUL 60950 certification by an NRTL
SNEBS Level 3 certified
SCAN/CSA-C22.2 No. 60950-00
SCompact, wall-mount enclosure

Section 28M-A20-8A0-20A 030-101678 Rev. A R
0803IARA
2
Model Number!CLEI* Code CPR/ Barcode Network Connector Types Customer Connector Types Power
Sl
Key
Lk
/
Wirewrap 25-pair Telco Wirewrap 25-pair RJ48H RJ48C/S Supply
y
Lock
28MA208A NCM48S0DRA N70493/442359 X X X X X X
28MA208AP NCM48T0DRA N70502/442418 X X X X X X X
Notes: 1. Model numbers are the base of the part numbers but without the prefix (i.e., A90-"). 2. All assemblies accommodate up to 8 half-width (200 MECHANICSr) modules or 4 full-width (400-type) modules.
3. All assemblies provide a lead-seal lock. * CLEI is a trademark of Telcordia Technologies.
Table 1. Ordering and Option Information
S8-circuit capacity with 200 MECHANICSrmodules (ac-
cepts both 400-type and 200-type modules)
S9th slot for 48 VDC power supply module
SUsed in digital or analog data applications
SMetal construction, with ventilation holes
SKey-locking front door for module-compartment (with see-
through window and lead seal lock)
SSecure covers for Facility and Customer wiring areas (also
contains lead seal)
SBarrier strip/terminal block for external power source
SVariety of input/output wiring options
SFacility wirewrap and 25-pair cable connectors
SCustomer wirewrap, RJ48C/S, and RJ48H connectors
SEight, module, card-edge connectors
S2-Amp fuse and fuse alarm LED
SBuilt-in wall-mount brackets (one-piece backplate)
SStrain relief wiring grommets at cable entrance holes
SStrategically-located cable tie-downs (ties included)
SGround lug (requires #6 AWG copper wire)
SCircuit ID card and clear, plastic, card packet
2. OPTIONS & FEATURES
This part describes each OmniPakt8 feature or option; Part 3
provides information for each feature which requires installer
wiring connections.
2.1 Exterior Features
The OmniPakt8 contains features and options accessible or
visible from the assembly exterior (see the paragraphs below).
2.1.1 Facility Compartment & Power Wiring Cover
A protective and secure metallic cover for the Facility connec-
tors and the power and ground connectors is provided at the top
of the OmniPakt8. The cover is removed by loosening the
thumb-type screw; however, the module door also must be
opened to release (unlock) an internal lock for this cover (a long
push-pin at the top of the module compartment slides into an in-
terior locking flange on the cover when the module door is
closed).
2.1.2 Module Front Door
The OmniPakt8 provides a removable protective door for the
modules which doubles as a see-through window to enable the
installer to easily view the modules’ status LEDs, for testing pur-
poses. A keyed lock secures the cover, to limit access to the
installed modules. When the module door is locked or closed,
the facility compartment cover cannot be opened.
2.1.3 Customer Wirewrap Compartment
A protective and secure metallic cover for the Customer wire-
wrap-pin connectors is provided at the bottom of the
OmniPakt8. The cover is opened by loosening the thumb-type
screw. If the RJ48C/S/H connector(s) are used for customer
connections, this compartment will not need to be opened.
2.1.4 Circuit ID Card and Card Sleeve
A circuit identification card and a clear plastic card packet is pro-
vided for customer convenience, to help the user identify the
cards that are installed in the OmniPakt8.
2.1.5 Built-in Mounting Brackets
A metal backplate at the rear of the OmniPakt8 contains built-
in mounting brackets with pre-drilled, key-slotted, mounting
holes. Two mounting holes are at the top and two are at the bot-
tom. To access the top mounting holes, the Facility
Compartment cover must be removed.
2.1.6 Cable Strain-Relief Grommets & Access Holes
A round cut-out near the top, right side of the assembly provides
Facility and power wiring/cable access through a strain-relief
grommet. A similar cut-out, with a strain-relief grommet, is lo-
cated at the bottom right side of the assembly, for customer
wiring and cabling access. A third cable access opening" is pro-
vided and created at the top right side when the Facility
Compartment cover is secured in place (best seen in Figure 1).
This opening is for larger and stiffer cables, like the Telco 25-pair
cables and the AC power cord of the power supply module.
2.1.7 Fuse Alarm LED
An FA Fuse Alarm LED is provided as an indication that the in-
ternal fuse is open. This red LED is located in the customer
wiring area by the RJ48C/S jacks (refer to Figure 2). When this
LED is lit, it indicates the internal 2 Amp fuse is open.
- NOTE -
The customer RJ48C/S jacks and the 25-pair RJ48H connector at
the bottom of the assembly can be accessed from the exterior, howev-
er these are explained under Paragraph 2.2.6, hereafter.

Section 28M-A20-8A0-20A
030-101678 Rev. A
R
0803IARA 3
Figure 2. Exploded View of OmniPak8
6
48
T R T1 R1 T R T1 R1 T R T1 R1 T R T1 R1
T R T1 R1 T R T1 R1 T R T1 R1 T R T1 R1
CKT1
2
35 7
F1
2 AMP
+ PWR
GND
− PWR
CT CR CT1CR1
P1
P2
FACILITY RCV IN
FACILITY XMT OUT
2
CKT1 35
6
7
48
CT CR CT1CR1
CT CR CT1CR1 CT CR CT1CR1
CT CR CT1CR1 CT CR CT1CR1
CT CR CT1CR1 CT CR CT1CR1
FRAME
GND
TB2
TB3
FRAME
GND
Module
Compartment
Two Lock-Types
Available
Keyed Lock
Wire Access Through
TB2/TB3 used to
connect drain wires
Ground Lug*
Terminal Strip for External Power Supply
External
Facility
Facility Wiring
Compartment
Customer Wiring Area
Customer
Wirewrap-Pin
Compartment
Keyhole Mounting Slot
(one in each corner)
Wire Access Through
50-Pin/25-Pair
Facility Connector
Connectors Supply Fuse
Ground
Lug*
Specific jack type is
determined by the setting of
the 2-position switch to the
right of the jack.
RJ48C/S Jack
50-Pin/25-Pair Customer
Connector (RJ48H)
Customer Wirewrap
Connector (4-Pin)
For Drain WireStatic Wrist Strap Jack
(ESD Ground)
(Locking, Hinged
(Cover Removed)
See Figure 3 for isometric
exploded view of assembly
showing doors/covers removed.
Door of
TB1
TB4 TB8 TB12 TB16
TB6 TB10 TB14 TB18
S
C
S
C
S
C
S
C
S
C
S
C
S
C
S
C
TB7 TB11 TB15 TB19
TB5 TB9 TB13 TB17
ESD
GND
RJ48S/RJ48C Jack Switch
Cover Removed for
Visual Clarity)
Gasket/Grommet
Gasket/Grommet
Protects 8
200 MECHANICS
and Power Supply
Modules
Wirewrap
Self-
Hole
Centering Power
For Drain Wire or
For Drain Wire
or Ground Lug*
* Any conductor connected to the/any ground lug must be
a #6 AWG copper wire. Unplated conductor (wire)
must be brought to a bright finish and anti-oxidant coated
before connection. All hardware must be listed by an NRTL.
Do not mix or use dissimilar metals when performing
bonding/grounding connections.
2.1.7.1 RJ48C/S Jacks (See Paragraph 2.2.6.2)
Under the module compartment are eight, exterior-accessible,
RJ48C/S jacks and accompanying switches. See Paragraph
2.2.6.2 for a description of these interior-access options.
2.1.7.2 RJ48H 50-Pin Connector (See Paragraph 2.2.6.3)
Under the module compartment is a single, exterior-accessible,
25-pair, RJ48H connector for customer connections. See Para-
graph 2.2.6.3 for a description of this particular customer
connection option.
2.2 Interior Features
The OmniPakt8 contains various features accessed from the
interior of the assembly. Some of these features are shown in
Figure 2 and explained in the paragraphs that follow.
2.2.1 Plug-in Module Mounting Slots
2.2.1.1 The OmniPakt8 can accommodate up to eight 200
MECHANICSr-type modules (or four 400-type modules) and
thus provides eight mounting slots, complete with card guides
and eight, 56-pin, card-edge connectors. The first, left-most slot
of the OmniPakt8 corresponds with RJ48C/S jack CKT 1 or
wirewrap pin connector CKT 1. The last, right-most slot corre-

Section 28M-A20-8A0-20A 030-101678 Rev. A R
0803IARA
4
È
È
È
È
È
È
È
È
È
È
È
È
ÈÈÈÈÈÈÈÈÈ
ÈÈÈÈÈÈÈÈÈ
Figure 3. Exploded View, Showing Compartments Doors/Covers Removed and Showing Mounting Hole Locations
Facility Compartment Cover
Module Compartment
See Note 1
Door
Note 1: Swing-open Customer Cover
removed for visual clarity.
Wall or backboard
Noncombustible
It is not necessary to remove the backplate
28MA208 is shipped fully-assembled:
this view is for visual clarity only.
to mount the assembly.
(remove to expose top mounting holes)
See Paragraph 3.3.1 for mounting details.
sponds with RJ48C/S jack or wirewrap pin connector CKT 8.
When 400-type modules are installed in the mounting, use odd-
numbered slots or circuits. Ventilation/air convection holes at
the top and bottom of the OmniPakt8 allow module-produced
heat to escape or dissipate.
2.2.1.2 A ninth module slot is provided in the OmniPakt8 for
an optional power supply module. The slot is the right-most slot,
labelled PS" for Power Supply. Route the power supply cable
through the cable access hole at the rear of the slot before insert-
ing the module.
2.2.2 External Power Supply Fuse
When using an external power supply to power the mounting,
a 2 Amp fuse, F1, located in the top Facility Compartment area
next to TB1, is provided to protect the mounting against over-
voltage or power surge.
2.2.3 Ground Lug
Two threaded studs and locking nuts (for optional ground lug
placement) are located at the top of the assembly, under the Fa-
cility Compartment Cover, as shown in Figure 2, as well a third
stud and nut located at the bottom of the assembly under the
Pin Cover Door. The ground lug accepts a #6 AWG copper
ground wire. See Figure 4 and Figure 5 for more wiring details.
- GROUNDING NOTES -
Always follow local safety precautions and standard operating proce-
dures for grounding the equipment when installing, upgrading, or
maintaining equipment. Any instructions or information contained
herein is subordinate to local codes and operating procedures or prac-
tices.
To maintain the UL Listing of these mountings, observe the following
when performing all grounding/bonding connections:
jOnly use conductors containing a like or similar metal type:
do not intermix metals.
jAny unplated conductor (attached to ground lug) shall be
brought to a bright finish and then coated with an anti-oxi-
dant prior to connection.
jAll grounding/bonding hardware must be listed by an NRTL.
j#6 AWG copper wire should be used.
2.2.4 Power/Ground Screw Terminal Block
For external power applications, a 3-position screw terminal
block is provided and located under the Facility Compartment
cover for power and ground connections. The left position is la-
belled +PWR-" and is for connection to the +V terminal of
a power supply. The middle position is labelled GND" and is
for connection to earth ground. The right position is labelled
-PWR" and is for connection to the -V terminal of the power
supply. See Figure 4 and Figure 5 for more wiring details for
this terminal block.
2.2.5 Facility Connections
Two types of connectors are available for Facility connections:
either 4-pin wirewrap connectors or 50-pin/25-pair Telco con-
nectors, as described hereunder. Both are located under the
protective Facility Compartment cover (Paragraph 2.1.1) at
the top of the mounting, as shown in Figure 3. Note that the as-
sembly is designed so that this cover cannot be removed unless
the module compartment door is open (a long push-pin slides

Section 28M-A20-8A0-20A
030-101678 Rev. A
R
0803IARA 5
into an interior locking flange on the cover when the module
door is closed).
2.2.5.1 Facility 4-Pin Wirewrap Connectors
Eight, 4-pin wirewrap connectors are available for Facility con-
nections on the OmniPakt8. These connectors are located
under the Facility Compartment cover near the top of the PCB.
The connectors are labelled CKT1 through 8, one for each cir-
cuit. Each connector has pins for T", R", T1", and R1".
2.2.5.2 Facility 50-Pin/25-Pair Connectors
Two 50-pin/25-pair Telco connectors for Facility connections are
also located under the Facility Compartment cover (Paragraph
2.1.1) at the top of the mounting. The left connector, P1, is la-
belled FACILITY RCV IN. The right connector, P2, is for
FACILITY XMT OUT.
2.2.6 Customer Connections
For ease of use, three types of connectors are available for Cus-
tomer connections: either wirewrap pins, RJ48C/S jacks, or one
25-pair RJ48H-type connector, as described hereunder.
2.2.6.1 Customer 4-Pin Wirewrap Connectors
On each OmniPakt8, in a separate internal compartment un-
der the assembly’s module area, are eight, 4-pin, wirewrap
connectors for customer connections. These connectors are lo-
cated under a Customer Wirewrap Pin cover (Paragraph 2.1.3)
at the bottom of the mounting. The connectors are labelled
CKT1 through 8, one for each circuit. Each connector has pins
for CT", CR", CT1", and CR1". A cut-out near the bottom,
right side of the assembly provides Customer wirewrap pin wir-
ing access through a strain-relief gasket or grommet.
2.2.6.2 RJ48C/S Jacks (Exterior Access)
Under the module compartment of the OmniPakt8 are eight
RJ48C/S jacks for customer connections. The jacks are labelled
CKT 1 (corresponds with slot/circuit 1) through CKT 8 (corre-
sponds with slot/circuit 8). A 2-position switch, labelled S" at
the top and C" at the bottom, is provided immediately to the
right of each RJ jack, which options the jack for either RJ48S or
RJ48C functionality.
2.2.6.3 RJ48H 50-pin/25-pair Connector (Exterior Access)
A third method for making customer connections is through an
RJ48H-type, 25-pair connector, located under the module
compartment near the bottom of the assembly, labelled CUS-
TOMER INTERFACE".
3. INSTALLATION
Installation consists of inspecting the equipment for damages,
following proper safety precautions, gathering the required
tools and equipment, determining the mounting location,
mounting the OmniPakt8, and making all appropriate ground-
ing, power, and wiring connections. The following paragraphs
provide detailed instructions for performing these procedures.
- INSPECTION NOTE -
Visually inspect the unit for damages prior to installation. If the
equipment was damaged in transit, immediately report the damage
to the transportation company and to Westell.
3.1 Following Safety Precautions
CAUTION
Risk of electric shock. Voltages up to 140 VDC (with reference to
ground) may be present on telecommunications circuits.
- 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.
- This equipment is intended to be used behind devices that
provide primary lightning protection.
- This installation should conform to NEBS (New Equipment
Building Specification) requirements and in accordance with
NEC and Local Codes, as required.
- This equipment is to be installed in a restricted access location.
Important Safety Instructions (Please Save)
When using your telephone/telecommunications equipment,
always follow basic safety instructions to reduce risk of fire,
electric shock, injury to person and damage to equipment, in-
cluding the following:
CAUTION
For maximum air flow and compliance with NEBS fire safety re-
quirements, do not dress the cables along perforated sections of
the mountings top surface.
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.
D. Slots and openings in the assembly are provided for ventilation. To pro-
tect it from overheating, these openings must not be blocked or covered.
This product should never be placed near or over a radiator or heat
register. This product should not be placed in a built-in installation
unless proper ventilation 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 holes or
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.
3.2 Gathering Tools and Supplies
The following tools and supplies are recommended to mount
or install the OmniPakt8.
jScrewdrivers (flat-head and Phillips-head)
jScrews or other appropriate wall fasteners (see note below)

Section 28M-A20-8A0-20A 030-101678 Rev. A R
0803IARA
6
jUtility knife
jAwl or drill with assorted bits
jHammer
jPliers or line cutters
jWirewrap tool
- UL LISTED HARDWARE NOTE -
To maintain the UL Listing of these mountings, only UL (or NRTL)
listed hardware should be used in this installation.
3.3 Determining the Mounting Location & Type
The OmniPakt8 should be installed by authorized trained
personnel only. In accordance with UL 60950, this equipment
is suitable for mounting on concrete or other noncombustible
surfaces only and in restricted access locations only. It is also
recommended that adequate horizontal and vertical space be
left between multiple installations to allow for proper cable ac-
cess and ventilation. The distance from the cable entry point
should be consistent with local installation practices.
3.3.1 Wall-Mounting Single Assemblies (Typical)
Mount the OmniPakt8 per local company practice, or if none
exist, per the instructions below. The OmniPakt8 is typically
wall-mounted at the customer premises. Westell recommends
mounting this OmniPakt8 to a backboard, concrete surface,
or other noncombustible surface. The OmniPakt8 has a back-
plate with built-in mounting brackets that contain predrilled
mounting holes (key-slotted holes).
1. Expose the mounting holes on the OmniPakt8. Unlock
and open the assembly module door, then remove the Facil-
ity Compartment cover by loosening the thumb-type screw.
2. Select mounting location. Select a location on a wall which
insures maximum and adequate air flow, heat dissipation,
and compliance with NEBS fire safety requirements, unless
otherwise dictated by local codes.
3. Use template to mark mounted location on wall. Find then
place the mounting template (last page of this document)
against the wall in the desired mounting location. With a
marking utensil, mark the location of the top-center self-
centering" hole on the wall, then set aside template. (If the
self-centering feature is not desired, simply mark the locations of the
four corner mounting holes through the template, then go to Step 7.)
4. Drill hole for self-centering hole. Drill a hole in the wall for
the single, self-centering keyhole at the marked location.
5. Install self-centering screw & hang assembly on screw. Par-
tially install a screw into the hole drilled in the previous step,
leaving approximately ¼-inch of the screw protruding from
the wall, then temporarily hang the OmniPakt8 from the
screw. Be sure the screw is firmly planted in the wall.
6. Level the OmniPakt8 & mark the other mounting hole
locations on wall. While being ready to catch the OmniPak-
t8 should the single screw not stay in the wall, carefully let
the OmniPakt8 hang freely from the single screw on the
wall, to self-level" the assembly, then mark the locations of
the remaining four mounting holes. Set aside the assembly.
7. Drill holes. Drill appropriately-sized pilot holes, to accom-
modate the mounting screws or fasteners being used
(hardware not included), at the marked locations. Do not
make holes too big; the screws should be snug.
8. Install screws or wall fasteners. Partially install all screws
(or wall fasteners), leaving approximately ¼-inch of the
screw protruding from the wall.
9. Hang assembly on screws. Lift the OmniPakt8 again,
align the mounting holes on the OmniPakt8 backplate (or
side wall) with the partially-installed screws, and hang the
OmniPakt8 on the protruding screws.
10. Set screws. Finish driving (tighten) all screws in place.
11. Continue with wiring connections. To access the plug-in
module slots or wiring connectors, remove the covers.
3.4 Installer Connections
After mounting the OmniPakt8, installer connections may be
performed. See Figure 4 and Figure 5 for wiring details.
Figure 2 is a front view showing the connector locations and
types. For equipment and personal safety, always perform
grounding connections first.
- CAUTION -
Improper grounding could be service affecting and cause service
interruptions.
- GROUNDING CAUTION -
Always follow local safety precautions and standard operating
procedures for grounding the equipment when installing, up-
grading, repairing or maintaining equipment. Any instructions
or information contained herein is subordinate to local codes, op-
erating procedures or practices.
3.4.1 Chassis/Frame Ground Connections
To ensure safety to personnel, Westell recommends grounding
the OmniPakt8 as shown in Figure 4a, unless otherwise dic-
tated by local codes. For applications requiring chassis ground
to be connected to circuit ground, as shown in Figure 4b, an op-
tional green wire strap is provided for installation between the
GND lug and the TB1 GND terminal.
- GROUNDING NOTES -
Always follow local safety precautions and standard operating proce-
dures for grounding the equipment when installing, upgrading, or
maintaining equipment. Any instructions or information contained
herein is subordinate to local codes and operating procedures or prac-
tices.
To maintain the UL Listing of these mountings, observe the following
when performing all grounding/bonding connections:
jOnly use conductors containing a like or similar metal type:
do not intermix metals.
jAny unplated conductor (attached to ground lug) shall be
brought to a bright finish and then coated with an anti-oxi-
dant prior to connection.
jAll grounding/bonding hardware must be listed by an NRTL.
j#6 AWG copper wire should be used.
3.4.2 Power Connections
Modules installed in the OmniPakt8 can be either span (line)
or locally powered. Local power may be internal with a plug-in

Section 28M-A20-8A0-20A
030-101678 Rev. A
R
0803IARA 7
TB1
GND
SPAN POWER
To ground window
(e.g., cold water pipe)
LOCAL EXTERNAL POWER
−PWR+PWR
GND
SPAN POWER
To lightning
return ground
Figure 4. Typical Grounding Diagrams
The above method is preferred for compliance with Bellcore GR−1089.
Figure 4a. Preferred Grounding Diagram - For Installations Where Separate Frame and Circuit Grounds are Provided
The above method is preferred for compliance with Bellcore GR−1089.
Figure 4b. Alternate Grounding Diagram - For Installations Where only a Single Ground Connection is Provided
LUG
−
+
GND
To lightning
return ground
48VDC,
2A
POWER
SUPPLY
External Supply
(See Note)
Note: Connections
shown in this diagram
are for illustrative
purposes only. Screw
terminals for the
actual external power
supply used may vary.
Also, when using an
external supply for
power, the installer
must provide a quick
disconnect feature
for the supply to
ensure compliance
with UL60950.
TB1
GND
LUG
−PWR+PWR
GND
LOCAL EXTERNAL POWER
−
+
GND
TB1
To ground window
(e.g., cold water pipe)
*
−PWR
+PWR
GND
**
48VDC, 2A
POWER
SUPPLY
External Supply
Note: Connections shown in this diagram are for
illustrative purposes only. Screw terminals for the
actual external power supply used may vary. Also,
when using an external supply for power, the
installer must provide a quick disconnect feature
for the supply to ensure compliance with
UL60950.
GND
LUG
TB1 *
−PWR
+PWR
GND
GND
LUG
(See Note)
* Optional green wire ground strap provided with assembly. ** A #6 AWG copper ground wire must be used (see GROUNDING NOTES in Paragraph 3.4.1).
**
supply module inserted into the right-most card slot of the as-
sembly, or external with a DC power supply.
- POWER NOTES -
1. This unit is to be connected to a reliably-grounded SELV (Safety
Extra-Low Voltage; < 60 volts) source of supply.
2. Local Power Supply should be listed to UL 60950 I.T.E.
3. A listed circuit breaker, rated at 3 Amps maximum when sup-
plied by a 48-volt DC source, shall be provided in the un-
grounded supply.
4. Recommended wire gauge: 20 AWG for 0 to 2.6 A.
5. A readily-accessible disconnect device that is suitably approved
and rated shall be incorporated in the field wiring.
3.4.2.1 Local Power - External DC Supply
When using an external power supply to power the assembly,
connections are made to TB1, the 3-position screw terminal
block located in the top Facility Compartment area. The pre-
ferred wire entry hole is the strain-relief grommet on the top
right side of the assembly. Make a small slit in the grommet, just
enough to allow wire access, for maximum strain-relief pur-
poses. The terminal block accepts stranded or solid wire.
Consult the power supply practice for more power supply de-
tails. Dress wires per company practice and secure with cables
ties to the tie-down provided on the mounting (after testing).
- NOTE -
When connecting the external power source to the mounting, a readi-
ly-accessible quick-disconnect device must be incorporated to en-
sure UL60950 compliance.
- FUSE NOTE -
When using an external power supply to power the mounting, a 2
Amp fuse, located in the top portion of the assembly next to TB1, is
provided to protect the mounting against overvoltage or power surge.
If an overvoltage or power surge occurs, the internal 2 Amp fuse
opens to protect the assembly from damage, which lights the FA Fuse
alarm LED at the assembly bottom.
3.4.2.2 Local Power - Plug-In Power Supply
For the 28MA208AP model, the included modular power sup-
ply plugs into the right-most assembly slot. The power cord and
plug is routed back then upward through the mounting (top
cover must be off) as the power supply is inserted into the slot.
Then insert the power cord into the opening or groove on the
side of the mounting for proper dressing of the cable.
- NOTE -
For the 28MA208AP model, a socket-outlet shall be installed near
the unit and be readily accessible.
3.4.2.3 Span (Line) Power
Power connections are not necessary for use with span-pow-
ered modules; however, circuit ground on TB1, the 3-position
screw terminal strip, must be connected as shown in Figure 4a.
3.4.3 Facility/Network Interface Connections
Facility side connections are made to either the 4-pin wirewrap
connectors or to the two 50-pin/25-pair Telco Facility connec-
tors (see Paragraph 2.2.5 and Table 1) in the Facility wiring
compartment at the top of the OmniPakt8. For maximum air

Section 28M-A20-8A0-20A 030-101678 Rev. A R
0803IARA
8
Figure 5. OmniPak8 Block and Wiring Diagram
TYPICAL FOR CIRCUITS 1−8
(SEE CABLE ASSIGNMENT CHART)
311X-XX 312X-XX
RJ48C/S
J1 −RJ48H
TO FACILITY
INTERFACE
XMT OUT
RCV
IN
OPTIONAL −EXTERNAL
POWER SOURCE
ESD
GROUND
CT1
CR1
CT
CR
T
RXMT
IN
RCV
OUT
T1
R1
TO
CUSTOMER
INTERFACE
T
R
T1
R1
Wire-Wrap Pins
XMT OUT
RCV
IN
TB3
FA
2 AMP
RCV
OUT
XMT
IN
P2
P1
Wire-Wrap
Pins
TB2
−PWR
+ PWR
GND
3527 17 35 1727
POWER SUPPLY
WHEN EQUIPPED
MULTIPLE TO
POSITION 1−8
GROUND LUG,
(takes #6 AWG
copper wire)
TO
CUSTOMER
INTERFACE
TO
FACILITY
INTERFACE
2
11 25 25
8 1 4 7 2 5
SCSCSCSC

Section 28M-A20-8A0-20A
030-101678 Rev. A
R
0803IARA 9
flow and compliance with NEBS fire safety requirements, do
not dress the cables along the mounting’s top surface perfora-
tions.
3.4.3.1 4-Pin Wirewrap Connectors
For wirewrap-pin connections, stripped Facility wires are
wirewrapped" to each pin with a wirewrap tool. The Facility
Compartment cover first must be removed, then wires are
routed through the round grommet at the top right side of the
assembly. Make a small slit in the grommet, just enough to al-
low wire access, for maximum strain-relief purposes. Then
route, dress, and secure wires to the pins per company practice.
Secure the wires to the cable tie-down on the OmniPakt8 with
cable ties, when complete (after testing). For wiring details and
pin designations, see Figure 2 and Figure 5.
3.4.3.2 25-Pair Connectors
Facility side connections alternately may be made to the two
50-pin/25-pair Telco Facility connectors in the Facility
Compartment area. The Facility Compartment cover first must
be removed, then cables are routed through the other cable ac-
cess opening provided at the top right side of the assembly
(created when the Facility Compartment cover is set in place,
best seen in the assembled view in Figure 1). After securing the
connectors, attach drain wires to screw terminals TB2 and TB3,
route cables through the right side opening, and secure cables
to the cable tie-downs on the OmniPakt8 with cable ties, when
complete (after testing). For wiring details and pin designa-
tions, see Figure 2 and Figure 5.
3.4.3.3 Cable Drain (Ground) Wiring Connector
If not already performed, make all cable drain wire connec-
tions at the appropriate stud or screw. Refer to Figure 2 for the
location of these studs/screws used for cable drain (ground)
wiring. Please note only one end of the drain wire should be
connected to prevent a ground loop.
3.4.4 Customer Interface Connections
Customer side connections are made to either the 4-pin wire-
wrap connectors, to the RJ48C/S jacks, or to the 50-pin/25-pair
RJ48H connector (see Paragraph 2.2.6 and Table 1) all located
in the Customer wiring area at the bottom of the OmniPakt8.
See the paragraph below that applies to the customer connec-
tion method preferred. After wiring installation and testing,
secure all wires/cables with a cable tie and the cable tie-down
provided.
3.4.4.1 4-Pin Wirewrap Connectors
For wirewrap pin connections, stripped customer wires are
wirewrapped" to each pin with a wirewrap tool. The Customer
Wirewrap Pin cover first must be removed, then wires are
routed through the grommet at the bottom right side of the as-
sembly. Make a small slit in the grommet, just enough to allow
wire access, for maximum strain-relief purposes. Then route,
dress, and secure wires to the pins per company practice. Se-
cure the wires to the cable tie-down on the OmniPakt8 with
cable ties, when complete (after testing). For wiring details and
pin designations, see Figure 2 and Figure 5.
3.4.4.2 RJ48C/S Jacks (and 2-Position Jack Switches)
Customer connections alternately can be made via the
RJ48C/S jacks, which do not require the removal of the Cus-
tomer Wirewrap Pin cover. Firmly insert each RJ48C/S plug
into each jack. To the right of each jack is a 2-position switch ,
labelled S" at the top of the switch and C" at the bottom. If
the application requires an RJ48S-type jack, set or slide the
switch to the S" position, towards the top. If the application
requires an RJ48C-type jack, set the switch to the C" position,
towards the bottom. Each switch is recessed, for security, and
requires a narrow or pointed tool (such as a narrow screwdriv-
er) to change the setting. Secure all cables to the cable tie-down
with a cable tie, after testing. For wiring details and pin designa-
tions, see Figure 2 and Figure 5.
3.4.4.3 25-Pair RJ48H Connector
Customer connections alternately can be made via the 25-pair
RJ48H connector, which does not require the removal of the
Customer Wirewrap Pin cover. Firmly insert the connector
into the receptacle provided (labelled CUSTOMER INTER-
FACE"), then secure the cable to the cable tie-down with a
cable tie, after testing. For wiring details and pin designations,
see Figure 5.
3.4.4.4 Cable Drain (Ground) Wiring Lug
If not already performed, make all cable drain wire connec-
tions at the cable drain (ground) wiring studs/screws. Refer to
Figure 2 for the location of these stud/screws. Please note only
one end of the drain wire should be connected to prevent a
ground loop.
3.4.5 Module Installation
Both 200- and 400-type plug-in modules can be inserted into
the OmniPakt8 after the mounting installation is complete.
Before installing modules, set any option switches to the de-
sired positions. Align the module with the card guides above
and below the unit and insert as far as it will go into the slot con-
nector.
- NOTE -
To maintain the UL Listing of these assemblies, only UL recognized
modules that do not exceed the per slot" ratings outlined in Table 2
can be used. Also note that all modules will not necessarily be rated
for both AC and DC operation.
- 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 connectors and mounting
slots and gently re-insert the module.
3.4.6 Re-Installing Covers and Door
When all modules are installed, the assembly door can be re-
positioned, and the locking device secured. After making all
the necessary connections, the top cover can be positioned
back into place and the thumb-screw re-tightened (manually or
with a screwdriver). The bottom cover can also be closed and
the thumb screw re-tightened manually or with a screwdriver.

Section 28M-A20-8A0-20A 030-101678 Rev. A R
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10
4. TESTING & TROUBLESHOOTING
4.1 Testing
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
6.2).
4.2 Troubleshooting
If trouble is encountered, verify all installer connections and
check that any fuses are not blown. Also verify all module con-
nections, switch settings, and verify modules are making
positive connections with the mounting connectors. If trouble
persists, replace suspect unit and repeat procedures outlined.
These procedures are not designed to effect repairs or modifi-
cations. Tests beyond those outlined herein, or repairs made
beyond replacing a faulty unit, are not recommended and may
void the warranty.
5. CUSTOMER & TECHNICAL SERVICES
5.1 Customer Service & Technical Assistance
If technical or customer assistance is required, contact Westell
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.
5.2 Part Numbers
As shown in Table 1, this equipment is identified by a part num-
ber (A90-28MA208A). Each part number contains an
equipment issue letter (A), the assembly type (90), and the spe-
cific model number (28MA208A). Each time a product change
affects the form, fit, or function of the product, the issue letter
is incremented or advanced by one. Indicate the issue level as
well as the model number when making inquiries about the
equipment.
6. WARRANTY & REPAIRS
6.1 Warranty
Westell warrants this product to be free of defects at the time
of shipment. Westell also warrants this product to be fully func-
tional for the time period specified by the terms and conditions
governing the sale of the product. Any attempt to repair or
modify the equipment by anyone other than an authorized
Westell representative will void the warranty.
6.2 Repair and Return
Westell will repair or replace any defective Westell equipment
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 request a Re-
turn 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 consistent
with the urgency of the situation. Westell will continue to repair
or replace faulty equipment beyond the warranty period for a
nominal charge. Contact Westell for details.
7. SPECIFICATIONS
To order units, call the telephone number shown in Paragraph
5.1 and please specify a specific model number shown in
Table 1. The electrical, physical, and regulatory agency specifi-
cations are shown in Table 2.
Physical Feature U.S. Metric
Height 12 inches 30.5 cm
Width 8 inches 20.3 cm
Depth 7.5 inches 19.05 cm
Weight w/o modules (OmniPakt8A
approx.)
7 pounds 3.2
Kilograms
Weight w/o modules (OmniPakt8AP
approx.)
8.5 pounds 3.9
Kilograms
Operating Temperature -18_C to +50_C 0_to 122_
F
Regulatory/Agency Specifications
SUL 60950 certified by an NRTL
SNEBS Level 3 certified
SCAN/CSA−C22.2 No. 60950−00
Electrical Feature
48 Volt Power Supply: -48 Vdc at 2 Amps, equipped on 28MA208AP only.
Fusing: 2.0 Amp GMT-type (available from Westell by specifying part number
009-000008).
Per Slot Ratings:
Mechanics Type AC Rating DC Rating
400-Type 218 to 42 Vac @ 70 mA 22 to 56 Vdc @ 350 mA1
200 MECHANICS318 to 42 Vac @ 70 mA 22 to 56 Vdc @ 65 mA
Note 1: For the 28MA208AP, the maximum DC current draw for a fully-populated mounting cannot
exceed 2.0 Amps.
Note 2: The per slot" power dissipation for a 400-type module should not exceed 7.5 watts.
Note 3: The per slot" power dissipation for a 200 MECHANICSrmodule should not exceed 3.75 watts.
Table 2. Specifications

Section 28M-A20-8A0-20A
030-101678 Rev. A
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Section 28M-A20-8A0-20A 030-101678 Rev. A R
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12
TEMPLATE
FOR MARKING WALL-MOUNTING HOLES
Place this template on the wall in the desired mounting location, then
mark the top mounting holes. The center hole can be used to
self-center the assembly. See Paragraph 3.3.1 for mounting details.