1Section 61213017L1-5, Issue 261213.017L1-5B
Section 61213017L1-5
Issue 2, September 1996
CLEI Code #DDRPHJA1_ _
PRACTICES
Figure 1. T400 U-RPM III
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
Sealing Current Generation
The T400 U-RPM III converts -48 or -72 VDC input
voltage to provide an output voltage of up to -120 VDC,
and up to 43 mA of sealing current. When used with the
ADTRAN ISDN U-Repeater II and III, the U-RPM III
operates in a constant current mode, allowing the output
voltage to change depending on the loop resistance
between the U-RPM and the U-Repeater. In this mode,
the U-RPM III provides the required constant 43 mA
sealing current, with output voltages ranging from -28
VDC to -120 VDC. When used with the ADTRAN I-NIU,
the U-RPM III operates in a constant voltage mode,
providing a constant -120 VDC. The output current will
be between 10 and 30 mA, dependant on loop resistance
between the I-NIU and the U-RPM III. The U-RPM III
automatically determines the correct mode of operation,
and does not require option selections.
1. GENERAL
The ADTRAN Type 400 U-Repeater Powering Module
III (T400 U-RPM III) is a T400 card used to power an
ADTRAN ISDN U-Repeater II, U-Repeater III, or the
ADTRAN I-NIU. Figure 1 is an illustration of the unit. It
can be deployed in any standard T400 single or multiple
housing, and is physically located between the U-
Repeater or I-NIU and the ISDN interface, such as an
ISDN switch or U-BRITE, as shown in Figure 2. The U-
RPM III can also be deployed in a Metallic Facilities
Termination (MFT) mounting when used with an
appropriately wired T400/MFT Adapter.
Revision History
Issue 3 has been revised to incorporate the ADTRAN I-
NIU functionality.
Features
The T400 U-RPM III, part number 1213017L1, features:
• Class A3 (-120 V) output voltage operation
• Battery return or earth ground option
• Front Panel LED indicating loop fault
• Passive transmission of data between U-LT and U-
Repeater
• Loop resistance monitoring from power module to U-
Repeater
• Factory replaceable fuse on input voltage line to
isolate from shelf
T400 U-RPM III
U-REPEATER III POWERING MODULE
INSTALLATION/MAINTENANCE
CONTENTS
1. GENERAL ......................................................................1
2. INSTALLATION .............................................................2
3. WARRANTY AND CUSTOMER SERVICE ...................3
FIGURES
Figure 1. T400 U-RPM III ..................................................1
Figure 2. T400 U-RPM III Application ...............................2
Figure 3. Connector Pin Assignments...............................2
A
B
C
2 Section 61213017L1-5, Issue 2 61213.017L1-5B
2. INSTALLATION
After unpacking the unit, immediately inspect it for
possible shipping damage. If damage is discovered, file
a claim immediately with the carrier, then contact
ADTRAN Customer Service (see section 3,
Warranty
and Customer Service
).
Select the appropriate grounding option for the U-RPM
III's faceplate using Jumper J1. The faceplate can be
grounded to either the -48V return (A and B) or frame
ground (B and C). When frame ground is selected,
backplane connector pins 11 or 27 must be connected to
Frame /Chassis ground of the housing.
Grasp the T400 U-RPM III by the faceplate and insert it
into a shelf slot. Push the T400 U-RPM III into the
backplane connector until firmly seated.
Voltages to -120 VDC may be present on
output to repeater when the unit is powered.
After installing the U-RPM III and the U-Repeater or I-
NIU, refer to the
appropriate ADTRAN U-Repeater
Installation/Maintenance
practice for installation
verification.
Figure 3 shows the connector pin assignments. All
connections to the unit are made through the T400-
compatible backplane. No additional backplane wiring
is necessary for normal operation.
Figure 2. T400 U-RPM III Application
Figure 3. Connector Pin Assignments
Top
View from
Pin End
Component
Side
-48 V / -72V
FRM GND
-48R
FRM GND
56
54
52
50
48
46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
55
53
51
49
47
45
43
41
39
37
35
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
1
To/From
Office
To/From
ADTRAN U-Repeater/I-NIU
MDF
T400
POWER
MODULE
ADTRAN ISDN
U-REPEATER/I-NIU
U-RPM III
CURRENT
SOURCE
43 mA
U-INTERFACE
LT
MAIN
DISTRIBUTION
FRAME
-
+
(41)
(47)
(7)
(13)
(11)
(27)
(17)
FRAME GND
-48V/-72V
BATTERY GND
To
Customer
NT1
Central Office
REPEATER
POWER
CONVERTER
(35)
ISDN SWITCH or
U-BR1TE
3Section 61213017L1-5, Issue 261213.017L1-5B
If using Frame ground option, backplane
connector pins 11 or 27 must be connected to
earth ground.
The T400 U-RPM III can be installed in Western Electric
Metallic Facilities Termination (MFT) mounting shelves.
The use of a T400/MFT adapter provides the mechanical
and electrical interfaces required for proper operation of
the U-RPM III in the MFT mounting. T400/MFT Adapters
are available in either a custom wired or an unwired
model from multiple suppliers. The unwired versions
require wire-wrapping to interconnect the T400 56-pin
connectors to the MFT 40-connector.
LOOP FAULT
A faceplate-mounted LED labeled
LOOP FAULT
illuminates when the loop is open to the repeater.
When
installed, the module dissipates approximately 2 watts.
3. WARRANTY AND CUSTOMER SERVICE
ADTRAN will replace or repair this product within ten
years from the date of shipment, if the product does not
meet its published specifications or if it fails while in
service. For detailed warranty, repair, and return
information, refer to the ADTRAN Equipment Warranty
and Return Policy and Procedure.
Return Material Authorization (RMA) is required prior to
returning equipment to ADTRAN. ADTRAN does not
recommend that repairs be performed in the field.
For service, RMA requests, or further information, contact
one of the following numbers:
ADTRAN Customer Service:
Applications Engineering (800) 615-1176
(Pre-Sales Support and Inquiries)
Technical Support (Post-Sales) (800) 726-8663
(Have unit serial number available.)
Sales (800) 827-0807
RMA (Repair Service) (205) 971-8722
Repair and Return Address:
ADTRAN, Inc.
Customer Service Department
901 Explorer Boulevard
Huntsville, Alabama 35806-2807
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