Section 28M-A20-8A0-20A
030-101678 Rev. A
R
0803IARA
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: (800) 377-8766
email:
For additional information about Westell, visit the Westell
World Wide Web site at http://
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: (630) 375-4211
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 (OmniPak
t
8A
approx.)
7 pounds
3.2
Kilograms
Weight w/o modules (OmniPak
t
8AP
approx.)
8.5 pounds
3.9
Kilograms
Operating Temperature
-18
_
C to +50
_
C
0
_
to 122
_
F
Regulatory/Agency Specifications
S
UL 60950 certified by an NRTL
S
NEBS Level 3 certified
S
CAN/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
2
18 to 42 Vac @ 70 mA
22 to 56 Vdc @ 350 mA
1
200 MECHANICS
3
18 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 MECHANICS
r
module should not exceed 3.75 watts.
Table 2. Specifications
